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HP0-894 exam Dumps Source : Implementing Windows Server 2003 on ProLiant Cluster Solutions
Test Code : HP0-894
Test Name : Implementing Windows Server 2003 on ProLiant Cluster Solutions
Vendor Name : HP
Q&A : 117 Real Questions
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EUC with HCI: Why It matters
in this, the latest installment in our sequence of home windows Server 2003 administration tutorials, we are going to take a glance at the method of enforcing IPSec on a windows Server 2003 gadget. we are going to also study one of the crucial strategies you should be aware of when performing this implementation on a reside community. once we're all executed, we'll look returned at the technique and weigh up the execs and cons, in search of to reply one simple query: Is it worth seeing that an IPSec implementation in your community?IPSec one hundred and one
before wading into a proof of the way to implement IPSec, we may still first take a moment to introduce you to, or refresh your talents of, this free and very advantageous system of securing network transmissions.
On a theoretical level, IPSec is a framework designed to give safety for IP based mostly network site visitors. On a realistic stage, it's a community layer protocol that encrypts information so that it can not be 'sniffed' from the community and then in consequence read or altered. IPSec achieves this functionality through two protocols called IPSec Authentication Header (AH) and IPSec Encapsulating protection Payload (ESP).
IPSec AH doesn't really encrypt information, however does deliver authentication and warranted information integrity. In other words, with IPSec AH, somebody can examine the information in a transmission, but they cannot alter it. Nor can someone false the source of the records. IPSec ESP, in distinction, focuses on securing the facts in the transmission, notwithstanding it does additionally provide some authentication, and a measure of statistics integrity checking.
The good information is that in a home windows Server 2003 IPSec implementation, as with most others, you do not should make a choice from IPSec AH and IPSec ESP. you could use each protocols to get the full advantage of IPSec – authentication, assured integrity of statistics, and encrypted statistics transfer.IPSec and home windows Server 2003
Now that we have recapped what IPSec is and does, we can get on with how to put in force it.
IPSec performance is equipped on a windows Server 2003 gadget throughout the IPSec features service. So, the first step in configuring IPSec is to be certain that here's running to your server through searching within the capabilities MMC. On a domain controller, the functions MMC can also be accessed throughout the Administrative tools menu. The IPSec service is configured to start automatically by means of default, so except it has been stopped or disabled, your examine should be nothing greater than cursory.
determine 1.(click for a larger picture)
The next a part of implementing IPSec is identifying and assigning an IPSec policy. IPSec guidelines, once assigned, define what actions should still be performed on incoming community traffic that does or doesn't meet a certain standards.
IPSec policies, and their components, are configured in the course of the IP safety policy administration MMC snap-in. There isn't any shortcut to this MMC on the administrative tools menu, so that you'll should open a clean MMC after which add the snap-in to it. once you have executed this, you will be in a position to delivery working within the IP safety administration MMC snap-in as shown in figure 1.structure of policies
The homes of an latest rule will also be considered by means of double-clicking the rule from in the IPSec safety policies snap-in. The residences web page for one of the default guidelines, that are mentioned in a moment, is proven in determine 2.
determine 2.(click on for a larger photograph)
As discussed, guidelines outline what moves are performed on community site visitors when the server is the use of IPSec. guidelines are made from suggestions that define what site visitors should be covered through the coverage, what kind of authentication mechanism may still be used (more concerning the alternate options for authentication later during this sequence), and what occurs to site visitors when it does or doesn't meet the criteria specific within the policy. This final method is widely used because the filter action. that you may also define no matter if or not this rule applies to all network connections, just these originating from the LAN, or just from faraway connections.
As that you could see from determine 2, there are three suggestions during this policy. the first defines that security should still be requested for all IP site visitors, and that the protection should use Kerberos (define) for authentication and encryption. The 2nd rule defines that every one ICMP site visitors (similar to that associated with ping and tracert) (outline) is accepted with no request for protection. The third rule (<default>) defines what happens to site visitors that doesn't conform to either of the first two suggestions.
a group of add-ons, standards, and protocols make up the general public Key Infrastructure (PKI), which protects statistics as it is transmitted over the network. The PKI is an vital point of protection inside a community. Digital certificates form the basis of the PKI as a result of these certificates use cryptographic algorithms and key lengths to protect facts as it is transmitted over the community.
The extra critical accessories of the PKI are summarized under:
while you could use third birthday party entity CAs for the PKI implementation within your organization, the management of certificates via such entities may become advanced, and take reasonably a while. here's especially true for companies which are somewhat colossal in dimension. With a home windows PKI implementation, you could create and control your own inner PKI structure in the organization. this may permit you to create, manipulate, and audit digital certificates for your atmosphere. tools can be found for creating and managing digital certificates in lively listing. you could display screen certificates, and revoke them as the need arises. The method that you'd use to your PKI implementation is ultimately determined via the safety requirements of the firm, and the vicinity of its clients.
The windows Server 2003 Public Key Infrastructure (PKI) is according to the following requisites:
The the rest of this article focuses on enforcing and configuring a PKI to your company, the usage of the purchasable graphical interface equipment. There are command-line utilities which that you could use to manipulate certificates and CAs. The Certification Authority administration console is however regarded the ideal tool for managing the CAs inside your PKI implementation. The command-line utilities which that you may use are listed below:
With a home windows PKI implementation, certificate templates are used to assign certificates, according to the goal for which they're for use. certificates templates will also be described as a set of suggestions and settings which specify the content and layout of certificates which are issued, according to intended use. You configure certificates templates on the CAs within your PKI implementation. The certificate template is utilized when a consumer requests a certificate from the CA. When a person requests a certificates, the consumer definitely selects forms of certificates as exact by way of certificates templates. make sure you customize the default certificate templates in accordance with its intended use before you install them within your environment. The security requirements of your corporation, ultimately determines which styles of protection templates should be deployed inside your company. Default certificates are offered for users, computers, code signing, and Encrypting File system (EFS).
The certificates templates additionally stipulate how a sound certificate request should still be submitted to the CA. From this brief dialogue, that you would be able to conclude that certificates templates ease the administration method of certificates, because it may also be used to automate the manner of issuing certificates, in line with the necessities set through the Administrator. windows Server 2003 comprises the brand new auto-enrollment feature which permits for the issuing of user certificates when the user logs on to a home windows Server 2003 client.
certificates templates are also used to control even if security principals are allowed to enroll, auto-enroll, or examine certificates, in keeping with the specific certificates template. each and every certificates template has an access control list (ACL) which specifies permissions for security principals for the particular certificates template. The certificates Templates snap-in is used to define permissions for certificates templates.
because diverse certificates templates can also be used for diverse clients, and they will also be used with the aid of an assortment of purposes; you can define utility guidelines. An utility coverage permits you to specify the method through which a certificate template can also be used, and with what functions.with a purpose to use a certificates template, the certificate template’s definition has to be posted in energetic listing, so that it's attainable to all CAs to your active directory wooded area. To enable this, certificate template counsel should be kept in lively listing. lively directory replication would distribute the certificates template’s definition to each and every CA within your PKI implementation.
home windows Server 2003 supports the following certificate template varieties:
The strategies which can be used to adjust an current edition 2 certificate template are listed beneath:
As mentioned preciously, windows Server 2003 contains default user certificate templates. These certificate templates are version 1 certificate templates, and are listed below:
With three hundred and sixty five days until Microsoft pulls the plug on windows Server 2003 aid, Hewlett-Packard is mounting a enormous companion-led offensive with the software large to upgrade a huge chunk of the 11.7 million servers still running the eleven-12 months-historic operating system.
HP said it's putting its solution company partners on the front traces of the $10 billion opportunity with what it is calling the HP Microsoft home windows Server 2003 Migration software.
The software is kicking off exactly 12 months to the day forward of when Microsoft formally ends home windows Server 2003 guide on July 14, 2015. HP and Microsoft formally rolled out the initiative Monday at Microsoft's worldwide companion convention in Washington D.C.
[Related: Microsoft Reminds Customers It's Ending Some Windows 7 Support Next January]
HP referred to the improve program is geared toward preventing probably disastrous security and assist concerns dealing with enterprises and even small organizations still the usage of old servers.
the new program provides partners with powerful new financial incentives backed up with a finished portfolio of evaluation services, tools, working towards and financing all designed to be certain purchasers are not caught flat-footed when home windows 2003 help is terminated.
"This software is going to allow channel partners to migrate shoppers more convenient, sooner and greater profitably than they may with every other vendor," said Doug Oathout, HP's vice chairman of world marketing, SMB and Alliances For HP.
The security risk posed by using the end of life for windows Server 2003 is appreciable, stated Oathout. "It can be a catastrophe of mammoth proportions" given the mission-important information being stored on windows Server 2003 techniques, he referred to.
HP estimates that a whopping 60 % of the valued clientele nevertheless operating windows Server 2003 don't have a full migration plan. With that in mind, HP is providing to pay partners for each migration assessment on all certified deals which are registered in HP's Salesforce.com Unison-based PartnerOne platform. Oathout pointed out the commonplace associate payout should be $3,000 to $5,000 per migration evaluation, though some might get as a whole lot as $10,000 depending on associate degree and opportunity size.
HP's expertise features crew has already put together a toolkit on the way to enable partners to do the assessments. there will even be new fiscal incentives and rebates with upsell and move sell opportunities for all registered windows Server 2003 enhancements.
The assessments are important on the grounds that many massive business valued clientele don't seem to be aware of simply how many windows Server 2003 servers and functions they are nonetheless operating. "right now IT departments won't have the time or components to get this executed on their personal," Oathout observed.
next: HP monetary capabilities presents Make improvements budget friendly
HP's standing because the biggest OEM for Microsoft assures most effective-in-classification aid, capabilities and incentives for companions, talked about Jim Ganthier, vice president of global initiatives and HP Servers. "we are placing the most beneficial and brightest of our teams collectively so channel partners can take skills of this big opportunity," he stated.
HP isn't simplest concentrated on big enterprises with the software, but is also offering HP SMB FlexBundles for specific offerings like Microsoft exchange, SQL Server and Lync with Microsoft Azure as a cloud backup answer, HP pointed out
HP is additionally offering partners with new HP monetary services offers that may well be essential as shoppers grapple with the can charge of migrating to new hardware and application platforms.
Leveraging the HP financial capabilities offers, a $3 million opportunity to upgrade 600 servers at $4,500 each for a total of $2.7 million with $300,000 in consulting capabilities may be capitalized with a month-to-month payment of $65,000 or 2.2 % of the total server and services, spoke of Alan Bowen, director of enterprise construction for HP fiscal services.
one more choice, Bowen said, is an HP Pre-provisioning answer that could allow consumers to pay best first 20 percent of the servers after ninety days with the rest being paid for as vital over the next one year.
Mike Strohl, CEO of Entisys solutions, a concord, Calif.-primarily based HP Platinum accomplice, No. 253 on the 2014 answer company 500, pointed out he sees the HP Microsoft software as a online game changer. "The payoff is big for partners with HP and Microsoft working at the side of us on this probability," he said, noting that every one his purchasers still have home windows Server 2003 systems. "They already have decent courses. This just adds to it. i admire the way have introduced a full program to the desk with enablement and economic services. they are manner forward of this from an enablement standpoint."
protection concerns surrounding the conclusion of lifestyles assist for windows Server 2003 are the foundation for a "very imperative foundation" for an improve discussion, pointed out Strohl. "When purchasers realize they'll be facing serious risk, they're going to delivery the three to 6 month improve planning cycle," he anticipated.
Strohl estimated that 60 percent of his clients will make the flow over the subsequent yr with the improve cycle accelerating within the 2d and third quarters next yr.
Strohl pointed out he sees the windows Server 2003 effort as a great deal more aggressive than the home windows XP end of lifestyles planning. "HP and Microsoft are stepping as partners collectively on this growing incentives, classes and support on the way to enable partners and shoppers to plot accurately so that they don't go through a nightmare with this manner," he observed.
published JULY 14, 2014
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Clustering SQL Server 2005 Services in Windows Server 2003 has been greatly enhanced from SQL 2000 on Windows 2000 clusters. There are quite some excellent articles in the internet offering guidance on cluster topics ranging from preparation, installation and configuration to post installation maintenance. On the other hand, the enhancements by the new versions also created certain confusions regarding cluster group failover behaviors due to the fact that the new failover behaviors are significantly different from what we used to expect from the older versions. The proof is that there are some questions posted in news groups complaining about something like "My SQL Server 2005 database engine failed last night. But the resource group didn't fail over to the passive node. Is the failover cluster not working? Why? Help! ".
To answer this kind of questions, we need to drill down to several basic Windows Server 2003 cluster concepts. There are several configuration items within the Windows 2003 Cluster Administrator tool that we need to explore in more details to get a better understanding about how the cluster failover works according to these configuration settings. This is important because it can help us take full advantage of the new failover mechanism offered by Windows Server 2003 and SQL Server 2005 to design a better failover solution to fit in individual Service Level Agreement (SLA) requirements.
About Cluster Administrator (CluAdmin.exe)
Cluster Administrator is a Microsoft Windows administrative tool to manage clusters in your domain. It is not part of the Administrative Tools programs by default. It is available after the Windows Cluster services are installed in your servers. It can also be installed in your Windows XP professional workstation as part of the Windows Server 2003 Admin tools Pack (adminpak.msi) installation. The pack can be downloaded from Microsoft website http://www.microsoft.com/downloads/details.aspx?FamilyID=c16ae515-c8f4-47ef-a1e4-a8dcbacff8e3&displaylang=enConfigure Cluster Properties
Once you have this tool ready for use either in Cluster node servers or in your local workstation, and you have administrative privileges to the clusters in your network, then you can launch it to examine, configure and manage a wide variety of cluster properties. This article will only focus on the following two levels of properties that have significant impacts on SQL cluster resources failover behaviors. The two levels of cluster properties are Group level and Resource level. Group properties have impact on all resources under the group, while Resource properties can have impact on its own resources most of the time with the exception of the "Affect the group" option, which will be covered with more details later in the article.
There are a number of Group and Resource cluster properties available for us to configure. However, we only focus on the ones that matter the failover behaviors. You will find these properties by right click on a Group or Cluster Resource and select Properties.Group Level Properties:
Failback: The properties can be found under Failback tab of a group properties window. It specifies what should happen when the group comes back online, and finds itself owned by a node other than its original primary node. Choose "Prevent Failback" to prevent the group from failing back to a failed node that returns to online status. Choose "Allow Failback" to enable failback. You should also specify that the failback will either occur immediately or within a specified span of hours.
What does this mean: In most cases, we should stick with the default setting of "Prevent Failback" to prevent an additional unnecessary failover. This will leave you more room and time to determine what caused the service failure and plan on a better time to fail it back once the root cause of the problem gets resolved. Otherwise, you will find your SQL services may have to be interrupted for twice as the cluster service trying to go back to its original primary node during an unpleasant time ( for a 24x7 server, any time could be unpleasant time unless it is scheduled ).Resource Level Properties:
You can find these properties by right-click on the concerning Resource, and select Properties. The following properties are under the Advanced tab in the Resource Properties window.
Restart: to specify whether or not to restart the resource if it fails.
What does this mean: For most resources, the Restart option should be selected because you want all cluster resources to be kept online.
Affect The Group: If selected, the group will fail over when the resource fails. The Threshold and Period values determine how many times the Cluster Service will attempt to restart the resource for a specific attempts within a specified period of time before the group fails.
What does this mean: This may be the most important single item to configure. There are only a handful of resources should have this option turned on. And if it is turned on for the resource, the Threshold and Period values control whether you want the Group to fail over to the other node(s) immediately or try to recover on the same node for the specified times within the period of time. Usually we would want it to fail over to the other node immediately because trying to recover on the same node could possibly be a waste of time without knowing the cause of the issue. The following Resource should usually have the "Affect the group" option turned on:- SQL Server database engine service
You may want to disable "Affect the group" option for the following resources to avoid unessential resources bringing down the entire group and the SQL engine.
In case these resources fail, investigations and manual restart should be performed without impacting the SQL engine service.
Below are the steps to configure SQL Server Agent Service so that a failure to the SQL Agent resource does not affect the group
Polling: Use the Looks Alive and Is Alive parameters to specify how often the Cluster Service polls the resource to determine if it is up
What does this mean: Usually we should use the default values of "Use values from resource type" unless you have a compelling reason for otherwise.
Pending Timeout: specify the amount of time a resource can be in a pending state before the Cluster Service fails the resource.
What does this mean: Same tactic as Polling should be applied to Pending Timeout. If there are issues with your cluster that require adjusting this parameter to avoid certain problems, you may want to tackle the root cause rather than playing around with the number unless this is your last resort.
Dependencies: This property is under Dependencies tab in the Resource Properties window to specify what other cluster resources are required online as a prerequisite for the resource to maintain online status.
What does this mean: This is the cluster resource internal integrity checking mechanism and it is a very important property to configure. For example, if the master database resides on cluster share H drive, then we have to make sure SQL Service has a dependency on H drive, such that SQL Service will wait for H drive being online before trying to bring itself online. Otherwise we will see error message if H drive is still in the process of bringing online when the SQL service resource is trying to start up.On the other hand, we should eliminate unnecessary dependencies for SQL services. We may want to remove SQL dependencies to resources not essential to database engine. For example, a dump/backup drive may not be a good candidate as a SQL dependency. (Noted that some database backup software does require this explicit dependency to make the drive available for operations)File Share in Cluster
In addition to the above two levels of properties, share folders used by critical SQL functionalities such as log shipping and snapshot replications, should be made as cluster resources. Local Windows folder share names on each node may be lost when failover occurs.For example, you create a folder share named "My_File_Share" on share drive F of the active node. If you don't defined the share folder as a FileShare cluster resource, the share name "My_File_Share" may not be recognized in the cluster after drive F fails over to another node. So the best practice to keep your folder share names is to make them cluster resources in the same group of the SQL engine services. To create a Clustered file share, please see KB article How to create file shares on a cluster (http://support.microsoft.com/kb/224967) for detailed steps.Conclusions
The above provided basic descriptions and configuration guide lines of the following configurable items: Failback, Dependencies, Restart, Affect Resource Group and its child parameters. All of the items could have significant impact on the SQL cluster group's failover behaviors. Users should be aware of the implications before implementing any of settings, and should test the adjusted environments to see if the changes match with your design expectations before roll out to production environments.
The first article in this new series, provided a brief overview of two main high-availability technologies incorporated into Windows 2003 Server operating system platform: server clustering and network load balancing. We focused on the former, describing some of the basic terminology and elementary design principles. We return to server clustering, this time looking at inter-node communication, specifically, Quorum. Quorum is at the heart of the three main server clustering models: Single Shared Quorum, Single Local Quorum, and Majority Node Set Quorum.
As explained, among the most important ones is maintaining a single instance of each clustered resource (ensuring at the same time its fault tolerance and preventing "split-brain" scenarios). This is accomplished through two basic mechanisms, resource virtualization and inter-node communication.
Resource virtualization requires each clustered service or application be represented by a number of related software and hardware components, such as disks, IP addresses, network names, and file shares, which can be assigned to any server participating in the cluster and easily transferred between them, if necessary. This is made possible by setting up these servers in a very specific manner, where they can access the same set of shared storage devices, reside on the same subnet, and are part of the same domain. For example, to create a highly available network file share, you would identify a shared disk drive hosting the share, an IP address (with corresponding network name) from which the share can be accessed remotely, and target file share, with its name and access permissions.
Although this sounds complicated and time consuming, all necessary resources are pre-defined, making this procedure fairly straightforward. Once resources are identified and configured (by specifying disk drive letters, assigning unique IP addresses, network names, or file share characteristics), they can be assigned to any server participating in the cluster (as long as each one is capable of supporting them). Resources can then be easily moved between nodes in case the one currently hosting them fails.The Importance of Quorum
Inter-node communication is facilitated through heartbeat signals carried over redundant network connections between cluster members and through Quorum's presence, which determines how resource ownership should be handled. As we pointed out, Quorum has the additional important function of storing the most up-to-date cluster configuration, copied subsequently to a dedicated registry hive on each node. Local copies are referenced when nodes join the cluster during startup. Because of its significance in clustering architecture, Quorum also serves as the basis for three main server clustering models:
Single Shared Quorum clusters are by far most popular among server cluster implementations. They most closely match the traditional clustering design (which is reflected by continuing support for this model since introduction of Microsoft Cluster Server in Windows NT 4.0 Server Enterprise Edition), offering high-availability of resources representing wide variety of services and applications as well as simplicity of installation and configuration.
As their name indicates, Single Shared Quorum clusters use storage design, which enables them to access the same set of disks from every cluster member. While underlying hardware varies widely (and might involve such types of technologies as SCSI, SANs, NAS, or iSCSI, which we will review more closely in our next article), the basic premise remains the same.
Only one instance of any specific resource is permitted at any given time within the cluster. The same applies to Quorum, located on a highly available disk volume, physically connected via a SCSI bus, Fibre Channel links, or network infrastructure to all servers participating in the cluster. Ownership of the shared volume is arbitrated to ensure it is granted only to a single node, thus preventing other nodes from accessing it at the same time (such situation would likely result in data corruption).
This arbitration is typically be handled using internal SCSI commands (such as SCSI reserve and SCSI release) as well as bus, Target, or Logical Unit Number (LUN) resets. The specifics depend on the type of storage technology implemented. Note that support for a clustering installation is contingent on strict compliance with the Hardware Compatibility List (which is part of the Windows Server Catalog, containing all clustering solutions certified by Microsoft). Therefore it is critical that you verify which system you intend to purchase and deploy. Quorum, in this case, is implemented as the Physical Disk resource, which requires having a separate volume accessible to all cluster nodes (clustering setup determines automatically whether the volume you selected satisfies necessary criteria).
Unfortunately, the majority of hardware required to set up clustered servers is relatively expensive (although prices of such systems are considerably lower than they were a few years ago), especially if the intention is to ensure redundancy for every infrastructure component, including Fibre Channel and network devices, such as adapters and switches, or disk arrays and their controllers. The cost might be prohibitive, especially for programmers whose sole goal is developing cluster-aware software or exploring the possibility of migrating existing applications into clustered environment.
To remediate this issue, Microsoft made such functionality available without specialized hardware setup, by allowing the installation of a cluster on a single server with local storage only (known also as a single node cluster). Obviously, such configuration lacks any degree of high availability, but it has all features necessary for application development and testing. Since local disks are not represented as Physical Disk resources, this clustering model requires using a distinct resource type called Local Quorum when running New Server Cluster Wizard during initial setup, which we will review in details later.
Despite the benefits mentioned earlier (such as a significant level of high availability and compatibility with a variety of hardware platforms, applications, and services), Single Shared Quorum has limitations. The first one is inherent to the technologies used to implement it. For example, configurations relying on SCSI-based shared storage are restricted by the maximum length of the SCSI bus connecting all cluster nodes to the same disk array (which typically forces you to place them in the same or adjacent data center cabinets). This distance can be increased considerably by switching to a Fibre Channel infrastructure, but not without significant impact on hardware cost. Introducing iSCSI and NAS into the arsenal of available shared storage choices provides the same capability at lower prices, but there are still some caveats that restrict their widespread use (e.g., NAS devices are not supported as the Quorum resource). The second limitation that despite redundancy on the disk level (which can be accomplished through RAID sets or duplexing, with fault-tolerant disks and controllers), Single Shared Quorum still constitutes a single point of failure.
There are third-party solutions designed to address both of these limitations, and with release of Windows 2003 Server-based clustering, Microsoft introduced its own remedy in the form of Majority Node Set (MNS) Quorum. Like Local Quorum, MNS is defined as a separate resource that must be selected during cluster setup with New Server Cluster Wizard. Also like Local Quorum model, dependency on the shared storage hosting Quorum resource is eliminated, without having a negative impact on high availability.
The level of redundancy is increased by introducing additional copies of Quorum stored locally on each node (in the %SystemRoot%ClusterMNS.%ResourceGUID%$%ResourceGUID%$MSCS folder, where %ResourceGUID% designates a 128-bit unique identifier assigned to the cluster at its creation). As you can expect, having more than one Quorum instance requires different approach to preventing "split-brain" scenario. This is handled by defining a different rule that determines when cluster is considered operational (which, in turn, is necessary to make its resources available for client access). For this to happen, more than the half of cluster nodes must be functioning properly and be able to communicate with each other. The formula used to calculate this number is:[(total number of nodes in MNS cluster)/2] + 1
where the square brackets denote Ceiling function, returning smallest integer equal to or larger than the result of dividing total number of nodes by two. For example, for a five-node cluster, three nodes would need to be running and communicating for its resources to be available (the same would apply to a four-node cluster). Clearly, setting up a two-node MNS cluster, although technically possible, does not make much sense from availability perspective (since one node's failure would force the other one to shut down all of its resources). For an MNS cluster to function, at least two servers (in an three-node cluster) must be operational (note that with a Single Shared Quorum, a cluster might be capable of supporting its resources even with one remaining node).
Effectively, the rule guarantees that at any given point there will be no more than a single instance of every cluster resource. Clustering service on each node is configured to launch at boot time and to try to establish communication with majority of other nodes. This process is repeated every minute if the initial attempt fails.
This solution introduces additional requirements, since its architecture implies existence of multiple copies of the clustered data (unlike with Single Shared Quorum model), which must be consistently maintained. Although the clustering software itself is responsible for replication of Quorum configuration across all nodes, this does not apply to services and application-specific data. In general, there are two ways of handling this task. The first one relies on mechanisms built into the application (e.g., log shipping in SQL Server 2000/2005 deployments). The second one involves setting up replication on file system or disk block level. This can be handled through software or hardware, a topic we plan to elaborate on in the next article.
In addition, since clustered resources are virtualized, some of the restrictions placed on the Single Shared Quorum model still apply. In particular, for resource failover to take place, nodes must be able to detect failure of others through the absence of heartbeat signals. This requires round trip latency between nodes be no longer than 500 ms- affecting, in turn, the maximum allowed distance between them. They also must be members of the same domain and their public and private network interfaces have to reside (respectively) on the same subnets (which can be accomplished through setting up two VLANs spanning multiple physical locations hosting cluster nodes).
Furthermore, since Quorum updates are handled via network file shares called %ResourceGUID%$ (associated with the Quorum location listed earlier), both Server and Workstation services (LanManServer and LanManWorkstation, respectively) must be running on all cluster nodes and File and Printer Sharing for Microsoft Networks must be enabled for both private and public network connections.
Thus, when designing an architecture it is important to keep in mind the impact the architectural design will have on availability of the MNS cluster. For example, setting up two sites separated by a network link with an equal number of nodes in each will cause both to fail if communication between them is severed (since neither one contains majority of nodes). It might be beneficial in such situation to set up a third site with a single cluster node in it (and dedicated network links to the other two sites), dedicated exclusively to establishing majority node count when needed. Alternatively, you can also force some of the cluster nodes to host resources, although this requires manual intervention.
Windows Server 2012 is coming out with a vast set of new features and introduces support for server applications, such as Hyper-V™ and Microsoft SQL Server, which can store live data on Windows file shares. A new update drives a wholesale shift away from SANs' complexities to a simpler, NAS-like foundation.
The new Scale-Out File Server is an active/active file server cluster that is designed to provide scale-out file shares for file-based server application storage. Since the SOFS only supports storing application data on file shares, the new SMBv3.0 functionality provides continuous availability and transparent failover for those shares to the supported applications.
Implementing Scale-Out File Servers requires all the application data shares to be hosted on Cluster Shared Volumes v2 (CSVv2) and, therefore, it requires a shared storage to enable the access to share content through all the Scale-Out File Server nodes simultaneously. Shared storage can be composed of the clustered PCI RAID (on shared SAS JBOD), Fibre Channel/ iSCSI/ SAS fabric (on arrays). All of these technologies have one thing in common – they all require additional hardware and many deployment elements.
StarWind software runs on the same physical machines where the Scale-Out File Servers configuration is built and turns the existing DAS into highly available, flexible, and fault-tolerant SAN. Therefore, StarWind eliminates a need in additional hardware while increasing server utilization. It allows building an Active-Active High Availability (HA) storage architecture that ensures high reliability, great performance, and maximum uptime of the IT infrastructure. Moreover, StarWind is a cost-effective and affordable solution that is well suited for SMBs and cost-conscious businesses.
"Failover Clustering and Cluster Shared Volumes are the key foundational technologies for Scale-Out File Servers and they require a shared storage to eliminate a single point of failure," said Artem Berman, Chief Executive Officer of StarWind Software, Inc. "StarWind iSCSI SAN software provides highly available shared storage for Scale-Out File Server at an affordable price and delivers an ideal mix of performance, simplicity, and advanced data protection features."
About StarWind Software Inc.StarWind Software is a global leader in storage management and SAN software for small and midsize companies. StarWind's flagship product is SAN software that turns any industry-standard Windows Server into a fault-tolerant, fail-safe iSCSI SAN. StarWind iSCSI SAN is qualified for use with VMware, Hyper-V, XenServer and Linux and Unix environments. StarWind Software focuses on providing small and midsize companies with affordable, highly availability storage technology which previously was only available in high-end storage hardware. Advanced enterprise-class features in StarWind include Automated HA Storage Node Failover and Failback (High Availability),Replication across a WAN, CDP and Snapshots, Thin Provisioning and Virtual Tape management.
Since 2003, StarWind has pioneered the iSCSI SAN software industry and is the solution of choice for over 30,000 customers worldwide in more than 100 countries and from small and midsize companies to governments and Fortune 1000 companies.
For more information on StarWind Software Inc., visit: www.starwindsoftware.com
Press Contacts:StarWind Software Inc.+1 (617) email@example.com
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