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HH0-440 - Storage Architect - Performance & Virtualization - Dump Information

Vendor : Hitachi
Exam Code : HH0-440
Exam Name : Storage Architect - Performance & Virtualization
Questions and Answers : 117 Q & A
Updated On : December 14, 2018
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HH0-440 Questions and Answers

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HH0-440 Storage Architect - Performance & Virtualization

Study Guide Prepared by Killexams.com Hitachi Dumps Experts


Killexams.com HH0-440 Dumps and Real Questions

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HH0-440 exam Dumps Source : Storage Architect - Performance & Virtualization

Test Code : HH0-440
Test Name : Storage Architect - Performance & Virtualization
Vendor Name : Hitachi
Q&A : 117 Real Questions

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Hitachi Hitachi Storage Architect -

Hitachi storage applied sciences underpin AI and cloud plans | killexams.com Real Questions and Pass4sure dumps

As an illustration of its future direction, Hitachi Vantara dedicated an awful lot of its fresh person convention to explaining...

where its storage fits with AI and the web of issues.

whereas company executives painted the massive graphic at Hitachi next in September, particulars on the Hitachi storage approach acquired little attention. The specifics will delivery popping out in the next a number of months, noted Nathan Moffitt, Hitachi senior director of AI operations software and infrastructure methods.

"Over the future, there will be a pair pivots we're going to make," Moffitt said. "One is to have a storage operating equipment with the agility to cowl a broader latitude of use situations on the core, the side and the cloud. an additional pivot is to coalesce and collate information sources to aid you're making enhanced decisions."

Hitachi Vantara is a subsidiary of Tokyo-based Hitachi Ltd. The company changed into launched in 2017,combining its Hitachi records systems (HDS) storage unit, Hitachi insight group and Pentaho IoT facts analytics.

but some ask yourself if the dealer already regrets its resolution to circulate away from the HDS company. Hitachi's cloud message is hazy, and it appears to be enjoying seize-as much as rivals with built-in storage for AI, nonvolatile reminiscence categorical (NVMe) flash and multi-cloud records capabilities.

"I suppose Hitachi made such a wide swing far from the storage message that they realized they may also have long past too some distance. Now they're making an attempt to get the pendulum to swing again the other way," spoke of Mark Peters, an analyst at commercial enterprise strategy neighborhood. "From every thing they've stated, it feels like they're trying to head back to being Hitachi records techniques, which had greater of a spotlight on the storage."

Hitachi AI equipment

The identify alternate signaled Hitachi's intent to sell storage and different applied sciences to a restricted variety of customers, ordinarily high-greenback contracts with longer income cycles.

probably the most contemporary Gartner Magic Quadrant document lists Hitachi Vantara's virtual Storage Platform (VSP) as a leading all-flash array. however through design, Hitachi is selling less of its flagship storage at once to mainstream facts facilities. The supplier spoke of it has usually ceded hardware refresh cycles to opponents, preferring to target high-end industrial sectors.

The approach makes it possible for Hitachi storage to be mixed with different enterprise items in the Hitachi portfolio. Hitachi Ltd. posted $19.9 billion in consolidated salary in the quarter that resulted in June.

The flow to develop storage for analyzing machine-generated data suits the overall Hitachi portfolio, which includes agencies spanning the automobile, development, defense, electronics, power and medical industries.

"Hitachi storage is [aiming] at a stronger level, which allows for different materials of the Hitachi portfolio to be brought into an answer. That helps them create revenue alternatives at the line-of-enterprise degree, as opposed to just the IT stage," mentioned Eric Burgener, an analyst at IDC.

An illustration is Hitachi Transport device (HTS), which sells trains, tracks and other actual infrastructure. HTS reportedly is bidding on a multibillion-greenback contract with Finland's national railway system that might consist of storage and AI automation technologies.

Hitachi's storage improvements now middle on mobility throughout native and cloud tiers. it be an method other carriers have taken, most certainly the NetApp information material technologies.

The "intelligent facts pipeline" encompasses fundamental Hitachi VSP storage arrays, Hitachi content material Platform object storage, Hitachi business Cloud and distinctive hybrid clouds, talked about Iri Trashanski, a senior vp of infrastructure and area products at Hitachi.

"we have considered information centers flow from consolidated architecture to 1 that is extra dispensed. We introduced capabilities on the facet. We name it an intelligent statistics pipeline. We help you ingest, cleanse, enrich and monetize your statistics," Trashanski mentioned.

An update in June to the flagship Hitachi Storage Virtualization operating device (SVOS) delivered aid for software-defined storage on commodity servers. SVOS was supported other providers' hardware before, however most effective by the use of the VSP controller.

Hitachi personalized the code base for diverse models of VSP hardware.

"it's no longer a full virtual laptop, simply an encapsulation of the code that can also be dropped onto any gadget," Moffitt mentioned.

NVMe for hyper-converged anticipated in 2019

Hitachi in September launched an all-flash Unified Compute Platform hyper-converged infrastructure with integrated NVMe flash. NVMe-based VSP arrays are also on Hitachi's storage roadmap.

even if most storage carriers already sell NVMe items, Hitachi spoke of it's going to wait until 2019 to introduce a technology of NVMe flash-primarily based VSP arrays. meanwhile, Hitachi will support valued clientele identify the most desirable use cases for NVMe flash, observed Mark Adams, a Hitachi product advertising and company administration director.

"NVMe is not a plug-and-play expertise. There are loads of issues that deserve to be considered. We want to assist purchasers make certain they installation NVMe for the correct use circumstances," Adams pointed out.

Hitachi's customized flash hardware helps its SAS-based VSP arrays deliver efficiency this is shut or akin to NVMe flash, Adams introduced. "We would not have any customers complaining that our SAS-based VSP arrays are too slow -- none," he referred to.


Hitachi digital Storage Platform: Product Overview and perception | killexams.com Real Questions and Pass4sure dumps

See the whole list of accurate 10 leading Flash Storage vendors

bottom line:

Hitachi is concentrated on the excessive conclusion of the AFA market and mission-crucial functions. It has one of the highest delight, aid and fine rankings with valued clientele. Its entry cost can be greater than opponents, however awesome efficiency numbers make it a robust candidate for a lot of midsize and big commercial enterprise projects.

jump to: Hitachi VSP features table

company Description:

Hitachi Vantara is a rebranding of Hitachi records techniques (HDS). Hitachi Vantara became established in the Fall of 2017 during the combination of the capabilities of HDS, Pentaho and Hitachi perception neighborhood. As a unconditionally owned subsidiary of Hitachi, Ltd., it helps statistics-driven leaders find and use the cost of their data to innovate intelligently and attain effects that matter for business and society.

https://o1.qnsr.com/log/p.gif?;n=203;c=204650406;s=9477;x=7936;f=201801171513530;u=j;z=TIMESTAMP;a=20392955;e=i

data-Tech research neighborhood chosen the enterprise as a Champion in its Mid-latitude Storage 2017 record, calling Hitachi Vantara a characteristic-rich structure that's consistent from the enterprise right down to mid-range. shoppers include Nasdaq, Marketo, Paytronix and Edo.

Product Description:

Hitachi virtual Storage Platform (VSP) F series is a flash-powered answer for mission-vital applications. The scalability of the VSP F sequence goes to 34 PB of raw flash ability and 4.eight million random examine IOPS. This permits for consolidation of greater applications. The series contains the VSP F350, F370, F700, F900 and F1500 models.  The VSP F1500 is appropriate with mainframe workloads. at the coronary heart of each VSP F series mannequin is Storage Virtualization working equipment RF (SVOS RF) which gives storage virtualization, high availability, flash-optimized efficiency, high-quality of provider controls and facts coverage.

“This application offers average aspects, administration and interoperability throughout our portfolio to consolidate belongings, reclaim area, lengthen life, and cut back migration efforts,” pointed out Bob Madaio, vp, Infrastructure solutions marketing, Hitachi Vantara.

Key features:

Implementation: 

Very good. The product installation is simple and might be accomplished by using a newbie person in forty five minutes or much less. This contains the physical racking of a unit, constructing network connectivity, host mapping, RAID group creation and mapping a quantity to a server. Hitachi allows consumers to self-installation the VSP F350 and F370 which can be the smaller and lighter models.

Technical guide:

first rate, according to degree of contract. Hitachi presents three degrees of help contracts which differ in terms of response instances when onsite service is required. All of their plans include on-line aid tools in addition to phone help capabilities. They additionally present far flung monitoring and diagnostic capabilities.

“They give us particularly-skilled consulting for redesigning IT infrastructures focused on flash-based infrastructures and technical support was also pleasant for me. Implementation became effortless,” referred to the IT manager within the manufacturing industry

raw capacity:

4 PB or clustered up to 34 PB.

efficiency:

  • four.eight million random study IOPS.
  • forty eight GB/s
  • in response to SPC exams from remaining year, the A800 delivered probably the most IOPS at each the lowest response time and lowest $/GB than any of the different providers. note, youngsters, that on account that that time a couple of AFAs had been enhancements or absolutely changed.

    RAID/facts insurance plan:

  • A 100% information availability guarantee
  • Snapshots
  • Synchronous replication
  • Storage Saving aspects:

    Deduplication and compression. means discount is selectable on the extent stage for optimizing between effectivity and efficiency.

    statistics management:

  • each system comes packaged with application together with Hitachi Infrastructure Analytics guide (HIAA) for AI-driven insights and Hitachi records illustration Director (HDID) for insurance plan and copy data administration.
  • An upgrade to the advanced utility package gives you Hitachi Automation Director (HAD) to accelerate deployments and automate decision of considerations found out by using HIAA.
  • guide for Docker, Kubernetes and red Hat OpenShift in addition to OpenStack.
  • excellent of provider controls.
  • Storage virtualization consolidates external arrays as a long pool of potential with usual administration workflows and monitoring.
  • Storage Virtualization operating system RF (SVOS RF) which gives storage virtualization, excessive availability, flash-optimized performance, and records protection.
  • NVMe: No

    start:

    All fashions within the VSP F sequence are sold as home equipment the place utility is packaged with each system.

    Pricing:

    beginning record cost for the all-flash VSP F350 with the basis software package is $70,480. The system comes with 7.6TB of flash storage (uncooked), 36 months general maintenance, and the basis utility equipment, which comprises the SVOS RF working equipment core performance and local records insurance plan. It also offers Hitachi Storage guide for administration, Hitachi facts instance Director for insurance plan and copy administration as smartly because the AI-powered Hitachi Infrastructure Analytics guide.

    points

    Hitachi VSP

    Scale-up

    No

    Scale-out

    yes

    skill

    uncooked ability (no deduplication)

    eleven PB

    advantageous capability

    34 PB

    Networking (Max speed in Gbps)

    Fibre Channel

    sure

    Ethernet/iSCSI

    10GbE

    Infiniband

    No

    FCoE

    No

    efficiency

    IOPs

    four.8M

    Throughput

    48 GB/s

    Latency

    1 ms

    Storage Saving elements

    Deduplication

    sure

    Compression

    sure

    thin provisioning

    sure

    administration

    data encryption

    yes

    Snapshots

    yes

    Replication (synch or asynch?)

    each

    Availability

    percentage uptime (ex.: 99.999)

    6 x 9

    Non-disruptive application upgrades

    sure

    Non-disruptive hardware upgrades

    sure

    guarantee/guide

    Base warranty: array

    yes

    Base warranty: flash

    yes

    Flash replacement if pressure/module wears out earlier than assurance expires?

    yes

    Gartner Magic Quadrant rating

    leader

    rate

    starts at $70,480


    Hitachi Introduces Freedom Storage Lightning 9900 | killexams.com Real Questions and Pass4sure dumps

    news

    Hitachi Introduces Freedom Storage Lightning 9900
  • by way of Scott Bekker
  • 06/26/2000
  • Hitachi data techniques today rolled out the first in a new line of storage programs according to an internal change-network architecture.

    Hitachi's (www.hitachi.com) Freedom Storage Lightning 9900 is in accordance with the hello-celebrity structure that Hitachi says improves upon the shared bus architectures of latest subsystems. The Lightning 9900 points up to 6.4 GB per second of interior bandwidth.

    The Lightning subsystem gives you 37 terabytes of storage space, twice the skill of different storage subsystems. Lightning users may have a decision of 18 GB, forty seven GB, or seventy three GB drives, each packaged in a three.0-inch kind aspect and spinning at 10,025 rpm. The drives will run across 32 Fibre-Channel Arbitrated Loop (FC-AL) configurations to get rid of a big bottleneck to efficiency.

    "[The Lightning 9900] is a extremely technically superior product," referred to Dan Tanner of analyst enterprise The Aberdeen group (www.aberdeen.com). "it's a extremely high-conclusion, commercial enterprise degree product that appears to be capable of remarkable scalability, performance, and reliability."

    because of contemporary reorganization within Hitachi, youngsters, Tanner observed that the Lightning 9900 "may not be on the radar screens of the decision makers, and it can be."

    The Lightning will offer reproduction software corresponding to Freedom Storage 7700E, ShadowImage, Asynchronous remote copy, and NanoCopy, as well as support for IBM Corp.'s (www.ibm.com) Geographically Dispersed Parallel Sysplex (GDPS).

    The hello-famous person architecture offers switched factor-to-point connectivity between disks, cache, and host interfaces. Separate connections are used for statistics and manage paths. To additional expedite performance, Lightning accommodates distinctive sold-state cache recollections - as much as 32 GB of completely usable cache potential for statistics. handle tips is stored in separate memory banks.

    Lightning offers up to 32 Fibre Channel or ESCON ports to hosts or SANs. Lightning storage is designed to operate with loads of server systems, including Unix, windows NT/2000, Linux, Novell NetWare, and OS/390. - Isaac Slepner

    about the creator

    Scott Bekker is editor in chief of Redmond Channel accomplice journal.


    HH0-440 Storage Architect - Performance & Virtualization

    Study Guide Prepared by Killexams.com Hitachi Dumps Experts


    Killexams.com HH0-440 Dumps and Real Questions

    100% Real Questions - Exam Pass Guarantee with High Marks - Just Memorize the Answers



    HH0-440 exam Dumps Source : Storage Architect - Performance & Virtualization

    Test Code : HH0-440
    Test Name : Storage Architect - Performance & Virtualization
    Vendor Name : Hitachi
    Q&A : 117 Real Questions

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    Storage Architect - Performance

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    TYAN Highlights AMD EPYC™ Processor-Based HPC and Storage Server Platforms at SC18 | killexams.com real questions and Pass4sure dumps

    No result found, try new keyword!The platform takes full advantage of the AMD EPYC architecture by allowing maximum GPU deployment ... 2 drives for high capacity and high performance hybrid storage. For high density and high efficien...

    GigaIO Partners with NGD Systems to Explore High-Performance Computing Interoperability | killexams.com real questions and Pass4sure dumps

    CARLSBAD, Calif., Nov. 8, 2018 /PRNewswire/ -- GigaIO, Inc., an innovator of data center network architecture and connectivity solutions, today announces a new partnership with NGD Systems to advance high-performance computing (HPC) interoperability. The team will use GigaIO's FabreX™ platform and NGD Systems Computational Storage products to streamline data management in non-volatile memory express (NVMe) architecture.

    GigaIO's newest innovation, FabreX, is a hyper-performance network that dramatically accelerates advanced scale computing performance by delivering improved resource utilization and optimal user flexibility. Similarly, NGD Systems Computational Storage products are processing platforms that allow applications to smoothly operate with minimal data traffic and decreased central processing unit (CPU) memory requirements.

    "FabreX was developed to address today's data-intensive networks," says Alan Benjamin, CEO and president of GigaIO.  "When our teams plugged NGD's products into the FabreX Resource Box, we were thrilled to discover that the NGD products worked perfectly from the start and FabreX enabled seamless interoperability."

    "NGD Systems is proud to work with GigaIO to develop a deployment model for computational storage solutions within NVMe over fabric environments," says Eli Tiomkin, vice president of Business Development for NGD Systems. "The ability to combine the power of NGD Systems' computational storage devices with GigaIO's innovative NVMe over fabric technologies allows customers to extend NVMe storage solutions while providing a new way to manage that data locally."

    About GigaIOGigaIO provides game-changing hyper performance for advanced scale computing, giving users the flexibility to create exactly the system they need. The result is optimized performance and reduced total cost of ownership. With the innovative GigaIO FabreX™ architecture, data centers can scale up or out the performance of their systems, preserving their existing investment while adding the newest and latest capabilities. For more information, contact the GigaIO team at info@gigaio.com or visit www.gigaio.com.

    About NGD SystemsFounded in 2013 with its headquarters in Irvine, California, NGD Systems is a venture- funded company focused on creation of new category of storage devices that brings computation to data. NGD has designed its advanced proprietary NVMe controller technology which deploys patented Elastic FTL algorithm and Advanced LDPC Engines to provide industry leading capacity and scalability. The platform also deploys the patented In-Situ Processing technology to enable Computational Storage capability. The company is led by an executive team that helped drive and shape the flash storage industry, with decades in leadership positions with storage companies such as Western Digital, STEC, Memtech, and Micron. For more information, please visit www.ngdsystems.com.

    Media Contacts Olivia Metcalfe Townsend Team 858-945-8226, olivia@townsendteam.com 

    kimber@smithfidler.com Telephone: 775-298-5260

    pr@ngdsystems.com Telephone: 949-870-9148

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    Scaling Time Series Data Storage — Part II | killexams.com real questions and Pass4sure dumps

    In January 2016 Netflix expanded worldwide, opening service to 130 additional countries and supporting 20 total languages. Later in 2016 the TV experience evolved to include video previews during the browsing experience. More members, more languages, and more video playbacks stretched the times series data storage architecture from part 1 close to its breaking point. In part 2 here, we will explore the limitations of that architecture and describe how we’re re-architecting for this next phase in our evolution.

    Breaking Point

    Part 1’s architecture treated all viewing data the same, regardless of type (full title plays vs video previews) or age (how long ago a title was viewed). The ratio of previews to full views was growing rapidly as that feature rolled out to more devices. By the end of 2016 we were seeing 30% growth in one quarter for that data store; video preview roll-outs were being delayed because of their potential impact to this data store. The naive solution would be to scale the underlying viewing data Cassandra (C*) cluster to accommodate that growth, but it was already the biggest cluster in use and nearing cluster size limits that few C* users have gone past successfully. Something had to be done, and that too soon.

    Rethinking Our Design

    We challenged ourselves to rethink our approach and design one that would scale for at least 5x growth. We had patterns that we could reuse from part 1’s architecture, but by themselves those weren’t sufficient. New patterns and techniques were needed.

    Analysis

    We started by analyzing our data set’s access patterns. What emerged was three distinct categories of data:

  • Full title plays
  • Video preview plays
  • Language preference (i.e., which subtitles/dubs were played, indicating what is the member’s preference when they play titles in a given language)
  • For each category, we discovered another pattern — the majority of access was to recent data. As the age of the data increased, the level of detail needed decreased. Combining these insights with conversations with our data consumers, we negotiated which data was needed at what detail and for how long.

    Storage Inefficiency

    For the fastest growing data sets, video previews and language information, our partners needed only recent data. Very short duration views of video previews were being filtered out by our partners as they weren’t a positive or negative signal of member’s intent for the content. Additionally, we found most members choose the same subs/dubs languages for the majority of the titles that they watched. Storing the same language preference with each viewing record resulted in a lot of data duplication.

    Client Complexity

    Another limiting factor we looked into was how our viewing data service’s client library satisfied a caller’s particular need for specific data from a specific time duration. Callers could retrieve viewing data by specifying:

  • Video Type — Full title or video preview
  • Time Range — last X days/months/years with X being different for various use cases
  • Level of detail — complete or summary
  • Whether to include subs/dubs information
  • For the majority of use cases, these filters were applied on the client side after fetching the complete data from the back-end service. As you might imagine, this led to a lot of unnecessary data transfer. Additionally, for larger viewing data sets the performance degraded rapidly, leading to huge variations in the 99th percentile read latencies.

    Redesign

    Our goal was to design a solution that would scale to 5x growth, with reasonable cost efficiencies and improved as well as more predictable latencies. Informed by the analysis and understanding of the problems discussed above, we undertook this significant redesign. Here are our design guidelines:

    Data Category

  • Shard by data type
  • Reduce data fields to just the essential elements
  • Data Age

  • Shard by age of data. For recent data, expire after a set TTL
  • For historical data, summarize and rotate into an archive cluster
  • Performance

  • Parallelize reads to provide an unified abstraction across recent and historical data
  • Cluster Sharding

    Previously, we had all the data combined together into one cluster, with a client library that filtered the data based on type/age/level of detail. We inverted that approach and now have clusters sharded by type/age/level of detail. This decouples each data set’s different growth rates from one another, simplifies the client, and improves the read latencies.

    Storage Efficiency

    For the fastest growing data sets, video previews and language information, we were able to align with our partners on only keeping recent data. We do not store very short duration preview plays since they are not a good signal of member’s interest in the content. Also, we now store the initial language preference and then store only the deltas for subsequent plays. For vast majority of members, this means storing only a single record for language preference resulting in huge storage saving. We also have a lower TTL for preview plays and for language preference data thereby expiring it more aggressively than data for full title plays.

    Where needed, we apply the live and compressed technique from part I, where a configurable number of recent records are stored in uncompressed form and the rest of the records are stored in compressed form in a separate table. For clusters storing older data, we store the data entirely in compressed form, trading off lower storage costs for higher compute costs at the time of access.

    Finally, instead of storing all the details for historical full title plays, we store summarized view with fewer columns in a separate table. This summary view is also compressed to further optimize for storage costs.

    Overall, our new architecture looks like this:

    Viewing Data Storage Architecture

    As shown above, Viewing data storage is sharded by type — there are separate clusters for full title plays, preview title plays and language preferences. Within full title plays, storage is sharded by age. There are separate clusters for recent viewing data (last few days), past viewing data (few days to few years) and historical viewing data. Finally, there is only a summary view rather than detailed records for historical viewing data.

    Data Flows Writes

    Data writes go to into the most recent clusters. Filters are applied before entry, like not storing very short video previews plays or comparing the subs/dubs played to the previous preferences, and only storing when there is a change from previous behavior.

    Reads

    Requests for the most recent data go directly to the most recent clusters. When more data is requested, parallel reads enable efficient retrieval.

    Last few days of viewing data: For the large majority of use cases that need few days of full title plays, information is read only from the “Recent” cluster. Parallel reads to LIVE and COMPRESSED tables in the cluster are performed. Continuing on the pattern of Live and Compressed data sets that is detailed in part 1 of this blog post series, during reads from LIVE if the number of records is beyond a configurable threshold, then the records are rolled up, compressed and written to COMPRESSED table as a new version with the same row key.

    Additionally, if language preference information is needed, then a parallel read to the “Language Preference” cluster is made. Similarly if preview plays information is needed then parallel reads are made to the LIVE and COMPRESSED tables in the “Preview Titles” cluster. Similar to full title viewing data, if number of records in the LIVE table exceed a configurable threshold then the records are rolled up, compressed and written to COMPRESSED table as a new version with the same row key.

    Last few months of full title plays are enabled via parallel reads to the “Recent” and “Past” clusters.

    Summarized viewing data is returned via parallel reads to the “Recent”, “Past” and “Historical” clusters. The data is then stitched together to get the complete summarized view. To reduce storage size and cost, the summarized view in “Historical” cluster does not contain updates from the last few years of member viewing and hence needs to be augmented by summarizing viewing data from the “Recent” and “Past” clusters.

    Data Rotation

    For full title plays, movement of records between the different age clusters happens asynchronously. On reading viewing data for a member from the “Recent” cluster, if it is determined that there are records older than configured number of days, then a task is queued to move relevant records for that member from “Recent” to “Past” cluster. On task execution, the relevant records are combined with the existing records from COMPRESSED table in the “Past” cluster. The combined recordset is then compressed and stored in the COMPRESSED table with a new version. Once the new version write is successful, the previous version record is deleted.

    If the size of the compressed new version recordset is greater than a configurable threshold then the recordset is chunked and the multiple chunks are written in parallel. These background transfers of records from one cluster to other are batched so that they are not triggered on every read. All of this is similar to the data movement in the Live to Compressed storage approach that is detailed in part 1.

    Data Rotation between clusters

    Similar movement of records to “Historical” cluster is accomplished while reading from “Past” cluster. The relevant records are re-processed with the existing summary records to create new summary records. They are then compressed and written to the COMPRESSED table in the “Historical” cluster with a new version. Once the new version is written successfully, the previous version record is deleted.

    Performance Tuning

    Like in the previous architecture, LIVE and COMPRESSED records are stored in different tables and are tuned differently to achieve better performance. Since LIVE tables have frequent updates and small number of viewing records, compactions are run frequently and gc_grace_seconds is small to reduce number of SSTables and data size. Read repair and full column family repair are run frequently to improve data consistency. Since updates to COMPRESSED tables are rare, manual and infrequent full compactions are sufficient to reduce number of SSTables. Data is checked for consistency during the rare updates. This obviates the need for read repair as well as full column family repair.

    Caching Layer Changes

    Since we do a lot of parallel reads of large data chunks from Cassandra, there is a huge benefit to having a caching layer. The EVCache caching layer architecture is also changed to mimic the backend storage architecture and is illustrated in the following diagram. All of the caches have close to 99% hit rate and are very effective in minimizing the number of read requests to the Cassandra layer.

    Caching Layer Architecture

    One difference between the caching and storage architecture is that the “Summary” cache cluster stores the compressed summary of the entire viewing data for full title plays. With approximately 99% cache hit rate only a small fraction of total requests goes to the Cassandra layer where parallel reads to 3 tables and stitching together of records is needed to create a summary across the entire viewing data.

    Migration: Preliminary Results

    The team is more than halfway through these changes. Use cases taking advantage of sharding by data type have already been migrated. So while we don’t have complete results to share, here are the preliminary results and lessons learned:

  • Big improvement in the operational characteristics (compactions, GC pressure and latencies) of Cassandra based just on sharding the clusters by data type.
  • Huge headroom for the full title, viewing data Cassandra clusters enabling the team to scale for at least 5x growth.
  • Substantial cost savings due to more aggressive data compression and data TTL.
  • Re-architecture is backward compatible. Existing APIs will continue to work and are projected to have better and more predictable latencies. New APIs created to access subset of data would give significant additional latency benefits but need client changes. This makes it easier to roll out server side changes independent of client changes as well as migrate various clients at different times based on their engagement bandwidth.
  • Conclusion

    Viewing data storage architecture has come a long way over the last few years. We evolved to using a pattern of live and compressed data with parallel reads for viewing data storage and have re-used that pattern for other time-series data storage needs within the team. Recently, we sharded our storage clusters to satisfy the unique needs of different use cases and have used the live and compressed data pattern for some of the clusters. We extended the live and compressed data movement pattern to move data between the age-sharded clusters.

    Designing these extensible building blocks scales our storage tier in a simple and efficient way. While we redesigned for 5x growth of today’s use cases, we know Netflix’s product experience continues to change and improve. We’re keeping our eyes open for shifts that might require further evolution.

    If similar problems excite you, we are always on the lookout for talented engineers to join our team and help us solve the next set of challenges around scaling data storage and data processing.



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