"Hadoop helps customers understand what's going on by running business analytics against that data. With Isilon, these storage-processing functions are offloaded to the Isilon controllers, freeing up the compute servers to do what they do best: manage the map reduce and compute functions. Every IT specialist knows that RAID10 is faster than RAID5 and many of them go with RAID10 because of performance. Overview. Reference Architecture Dell EMC Isilon and Cloudera Reference Architecture and Performance Results Abstract This document is a high-level design, performance results, and best-practices guide for deploying Cloudera Enterprise Distribution on bare-metal infrastructure with Dell EMCâs Isilon scale-out NAS solution as a shared storage backend. For Hadoop analytics, the Isilon scale-out distributed architecture minimizes bottlenecks, rapidly serves big data, and optimizes performance for MapReduce jobs. Unlike other vendors who have recently introduced Hadoop storage appliances working with third-party Hadoop technology providers, EMC offers a single-vendor solution, Grocott said. While this approach served us well historically with Hadoop, the new approach with Isilon has proven to be better, faster, cheaper and more scalable. If I could add to point #2, one of the main purposes of 3x replication is to provide data redundancy on physically separate data nodes, so in the even of a catastrophic failure on one of the nodes you don’t lose that data or access to it.. Tools for Using Hadoop with OneFS. Blog Site Devoted To The World Of Big Data, Technology & Leadership, Pivotal CF Install Issue: Cannot log in as `admin’, http://www.infoworld.com/article/2609694/application-development/never–ever-do-this-to-hadoop.html, https://mainstayadvisor.com/go/emc/isilon/hadoop?page=https%3A%2F%2Fwww.emc.com%2Fcampaign%2Fisilon-tco-tools%2Findex.htm, https://www.emc.com/collateral/analyst-reports/isd707-ar-idc-isilon-scale-out-datalakefoundation.pdf, http://www.beebotech.com.au/2015/01/data-protection-for-hadoop-environments/, https://issues.apache.org/jira/browse/HDFS-7285, http://0x0fff.com/hadoop-on-remote-storage/, Presales Managers – The 2nd Most Important Thing You Do, A Novice’s Guide To EV Charging With Solar. Certification allows those vendors' analytics tools to run on Isilon. While Hadoop is already in common use in big data environments, it still faces several technical limitations which limit customer adoption, said Nick Kirsch, director of product management for EMC Isilon. EMC Isilon's OneFS 6.5 operating system natively integrates the Hadoop Distributed File System (HDFS) protocol and delivers the industry's first and only enterprise-proven Hadoop solution on a scale-out NAS architecture. "We're early to market," he said. Some of these companies include major social networking and web scale giants, to major enterprise accounts. For some data, see IDCâs validation on page 5 of this document: https://www.emc.com/collateral/analyst-reports/isd707-ar-idc-isilon-scale-out-datalakefoundation.pdf, Â Once the Hadoop cluster becomes large and critical, it needs better data protection. Hadoop is a scale out architecture, which is why we can build these massive platforms that do unbelievable things in a âbatchâ style. The key building blocks for Isilon include the OneFS operating system, the NAS architecture, the scale-out data lakes, and other enterprise features. This is the Isilon Data lake idea and something I have seen businesses go nuts over as a huge solution to their Hadoop data management problems. Some of these companies include major social networking and web scale giants, to major enterprise accounts. ; Installation. So for the same price amount of spindles in DAS implementation would always be bigger, thus better performance, 2. Hadoop architecture. Customers are exploring use cases that have quickly transitioned from batch to near real time. Dell EMC Isilon is the first, and only, scale-out NAS platform to incorporate native support for the HDFS layer. Isilon also allows compute and storage to scale independently due to the decoupling of storage from compute. What this delivers is massive bandwidth, but with an architecture that is more aligned to commodity style TCO than a traditional enterprise class storage system. One of the things we have noticed is how different companies have widely varying compute to storage ratios (do a web search for Pandora and Spotify and you will see what I mean). Big data typically consists of unstructured data, which includes text, audio and video files, photographs, and other data which is not easy to handle using traditional database management tools. It includes the Hadoop Distributed File System (HDFS) for reliably storing very large files across machines in a large cluster. BDE is a virtual appliance based on Serengenti and integrated as a plug-in to vCenter. Hadoop consists of a compute layer and a storage layer. This document gives an overview of HDP Installation on Isilon. Hadoop is an open-source platform that runs analytics on large sets of data across a distributed file system. Send your comments and suggestions to firstname.lastname@example.org. node info . Isilon uses a spine and leaf architecture that is based on the maximum internal bandwidth and 32-port count of Dell Z9100 switches. Each node boosts performance and expands the cluster's capacity. Change ), You are commenting using your Google account. Hereâs where I agree with Andrew. What this means is that to store a petabyte of information, we need 3 petabytes of storage (ouch). The Hadoop DAS architecture is really inefficient. Andrew argues that the best architecture for Hadoop is not external shared storage, but rather direct attached storage (DAS). Short overviews of Dell Technologies solutions for â¦ Storage Architecture, Data Analytics, Security, and Enterprise Management. What Hadoop distributions does Isilon support? The traditional thinking and solution to Hadoop at scale has been to deploy direct attached storage within each server. node boosts performance and expands the cluster's capacity. ... including 2.2, 2.3, and 2.4. Well there are a few factors: It is not uncommon for organizations to halve their total cost of running Hadoop with Isilon. In a typical Hadoop implementation, both layers exist on the same cluster. In one large company, what started out as a small data analysis engine, quickly became a mission critical system governed by regulation and compliance. Even commodity disk costs a lot when you multiply it by 3x. This approach changes every part of the Hadoop design equation. "It's Open Source, usually a build-your-own environment," he said. Not only can these distributions be different flavors, Isilon has a capability to allow different distributions access to the same dataset. Some other great information on backing up and protecting Hadoop can be found here: http://www.beebotech.com.au/2015/01/data-protection-for-hadoop-environments/, Â The data lake idea: Support multiple Hadoop distributions from the one cluster. With the Isilon OneFS 8.2.0 operating system, the back-end topology supports scaling a sixth generation Isilon cluster up to 252 nodes. An Isilon cluster fosters data analytics without ingesting data into an HDFS file system. Often this is related to point 2 below (ie more controllers for performance) however sometimes it is just due to the fact that enterprise class systems are expensive. Not true. 7! Most companies begin with a pilot, copy some data to it and look for new insights through data science. Hadoop works by breaking an application into multiple small fragments of work, each of which may be executed or re-executed on any node in the cluster. Node reply node reply . Isilon Hadoop Tools (IHT) currently requires Python 3.5+ and supports OneFS 8+. The pdf version of the article with images - installation-guide-emc-isilon-hdp-23.pdf Architecture. Press Esc to cancel. node info educe. The rate at which customers are moving off direct attached storage for Hadoop and converting to Isilon is outstanding. EMC on Tuesday updated the operating system of its Isilon scale-out NAS appliance with technology from its Greenplum Hadoop appliance to provide native integration with the Hadoop Distributed File System protocol. But this is mostly the same case as pure Isilon storage case with nasty “data lake” marketing on top of it. EMC has done something very different which is to embed the Hadoop filsyetem (HDFS) into the Isilon platform. Also marketing people does not know how Hadoop really works – within the typical mapreduce job amount of local IO is usually greater than the amount of HDFS IO, because all the intermediate data is staged on the local disks of the “compute” servers, The only real benefit of Isilon solution is listed by you and I agree with this – it allows you to decouple “compute” from “storage”. Same for DAS vs Isilon, copying the data vs erasure coding it. Performance. file . info . The article can be found here: http://www.infoworld.com/article/2609694/application-development/never–ever-do-this-to-hadoop.html. Isilon's upgraded OneFS 7.2 operating system supports Hadoop Distributed File System (HDFS) 2.3 and 2.4, as well as OpenStack Swift file and object storage.. Isilon added certification from enterprise Hadoop vendor Hortonworks, to go with previous certifications from Cloudera and Pivotal. Now having seen what a lot of companies are doing in this space, let me just say that Andrewâs ideas are spot on, but only applicable to traditional SAN and NAS platforms. All the performance and capacity considerations above were made based on the assumption that the network is as fast as internal server message bus, for Isilon to be on par with DAS. Cloudera Reference Architecture â Isilon version; Cloudera Reference Architecture â Direct Attached Storage version; Big Data with Cisco UCS and EMC Isilon: Building a 60 Node Hadoop Cluster (using Cloudera) Deploying Hortonworks Data Platform (HDP) on VMware vSphere â Technical Reference Architecture For Hadoop analytics, the Isilon scale-out distributed architecture minimizes bottlenecks, rapidly serves Big Data, and optimizes performance. In installing Hadoop with Isilon, the key difference is that, each Isilon Node contains a Hadoop Compatible NameNode and DataNode.The compute and the storage are on separate set of node unlike a common of Hadoop Architecture. Dell EMC Isilon | Cloudera - Combines a powerful yet simple, highly efficient, and massively scalable storage platform with integrated support for Hadoop analytics. This document does not address the specific procedure of setting up Hadoop â Isilon security, as you can read about those procedures here: Isilon and Hadoop Cluster Install Guides. Change ), You are commenting using your Twitter account. Explore our use cases and demo on how Hortonworks Data Flow and Isilon can empower your business for real time success. ( Log Out / Another might have 200 servers and 20 PBs of storage. Data can be stored using one protocol and accessed using another protocol. Typically they are running multiple Hadoop flavors (such as Pivotal HD, Hortonworks and Cloudera) and they spend a lot of time extracting and moving data between these isolated silos. INTRODUCTION This section provides an introduction to Dell EMC PowerEdge and Isilon for Hadoop and Spark solutions. 1. This approach gives Hadoop the linear scale and performance levels it needs. Funny enough SAP Hana decided to follow Andrew’s path, while few decide to go the Isilon path: https://blogs.saphana.com/2015/03/10/cloud-infrastructure-2-enterprise-grade-storage-cloud-spod/, 1. Not to mention EMC Isilon (amongst other benefits) can also help transition from Platform 2 to Platform 3 and provide a “Single Copy of Truth” aka “Data Lake” with data accessible via multiple protocols. Andrew, if you happen to read this, ping me â I would love to share more with you about how Isilon fits into the Hadoop world and maybe you would consider doing an update to your article ð. LiveData Platform delivers this active transactional data replication across clusters deployed on any storage that supports the Hadoop-Compatible File system (HCFS) API, local and NFS mounted file systems running on NetApp, EMC Isilon, or any Linux-based servers, as well as cloud object storage systems such as Amazon S3. IO performance depends on the type and amount of spindles. QATS is a product integration certification program designed to rigorously test Software, File System, Next-Gen Hardware and Containers with Hortonworks Data Platform (HDP) and Clouderaâs Enterprise Data Hub(CDH). file copy2copy3 . It brings capabilities that enterprises need with Hadoop and have been struggling to implement. NAS solutions are also protected, but they are usually using erasure encoding like Reed-Solomon one, and it hugely affects the restore time and system performance in degraded state. If the client and the PowerScale nodes are located within the same rack, switch traffic is limited. There is a new next generation storage architecture that is taking the Hadoop world by storm (pardon the pun!). Solution Briefs. You can find more information on it in my article: http://0x0fff.com/hadoop-on-remote-storage/. Because Hadoop has very limited inherent data protection capabilities, many organizations develop a home grown disaster recovery strategy that ends up being inefficient, risky or operationally difficult. file copy2copy3 . Real-world implementations of Hadoop would remain with DAS still for a long time, because DAS is the main benefit of Hadoop architecture – “bring computations closer to bare metal”. ! One observation and learning I had was that while organizations tend to begin their Hadoop journey by creating one enterprise wide centralized Hadoop cluster, inevitability what ends up being built are many silos of Hadoop âpuddlesâ. "But we're seeing it move into the enterprise where Open Source is not good enough, and where customers want a complete solution.". Before you create a zone, ensure that you are on 220.127.116.11 and installed the patch 159065. It is fair to say Andrew’s argument is based on one thing (locality), but even that can be overcome with most modern storage solution. Hortonworks Data Flow / Apache NiFi and Isilon provide a robust scalable architecture to enable real time streaming architectures. node info educe. Imagine having Pivotal HD for one business unit and Cloudera for another, both accessing a single piece of data without having to copy that data between clusters. This is the latest version of the Architecture Guide for the Ready Bundle for Hortonworks Hadoop v2.5, with Isilon shared storage. "We want to accelerate adoption of Hadoop by giving customers a trusted storage platform with scalability and end-to-end data protection," he said. Various performance benchmarks are included for reference. It is one of the fastest growing businesses inside EMC. ( Log Out / "This really opens Hadoop up to the enterprise," he said. Python MIT 23 36 3 (1 issue needs help) 0 Updated Jul 3, 2020 This is my own personal blog. Let me start by saying that the ideas discussed here are my own, and not necessarily that of my employer (EMC). (July 2017) Architecture Guide for Hortonworks Hadoop with Isilon.pdf (2.8 MB) View Download. Internally we have seen customers literally halve the time it takes to execute large jobs by moving off DAS and onto HDFS with Isilon. EMC Enhances Isilon NAS With Hadoop Integration ... thus preventing customers from enjoying the benefits of a unified architecture, Kirsch said. EMC has developed a very simple and quick tool to help identify the cost savings that Isilon brings versus DAS. Storage management, diagnostics and component replacement become much easier when you decouple the HDFS platform from the compute nodes. Isilon allows you to scale compute and storage independently. A high-level reference architecture of Hadoop tiered storage with Isilon is shown below. In a Hadoop implementation on an EMC Isilon cluster, OneFS acts as the distributed file system and HDFS is supported as a native protocol. Change ), You are commenting using your Facebook account. The QATS program is Clouderaâs highest certification level, with rigorous testing across the full breadth of HDP and CDH services. It can scale from 3 to 144 nodes in a single cluster. EMC has enhanced its Isilon scale-out NAS appliance with native Hadoop support as a way to add complete data protection and scalability to meet enterprise requirements for managing big data. In the event of a catastrophic failure of a NAS component you don’t have that luxury, losing access to the data and possibly the data itself. Change ). Arguably the most powerful feature that Isilon brings is the ability to have multiple Hadoop distributions accessing a single Isilon cluster. How an Isilon OneFS Hadoop implementation differs from a traditional Hadoop deployment A Hadoop implementation with OneFS differs from a typical Hadoop implementation in the following ways: Dell EMC ECS is a leading-edge distributed object store that supports Hadoop storage using the S3 interface and is a good fit for enterprises looking for either on-prem or cloud-based object storage for Hadoop. With Isilon, data protection typically needs a ~20% overhead, meaning a petabyte of data needs ~1.2PBs of disk. VMware Big Data Extension helps to quickly roll out Hadoop clusters. It also provides end-to-end data protection including all the features of the Isilon appliance, including backup, snapshots, and replication, he said. Official repository for isilon_sdk. Isilon, with its native HDFS integration, simple low cost storage design and fundamental scale out architecture is the clear product of choice for Big Data Hadoop environments. the Hadoop cluster. The default is typically to store 3 copies of data for redundancy. EMC fully intends to support its channel partners with the new Hadoop offering, Grocott said. ; isilon_create_directories creates a directory structure with appropriate ownership and permissions in HDFS on OneFS. MAP R. educe . Typically Hadoop starts out as a non-critical platform. The update to the Isilon operating system to include Hadoop integration is available at no charge to customers with maintenance contracts, Grocott said. So Isilon plays well on the “storage-first” clusters, where you need to have 1PB of capacity and 2-3 “compute” machines for the company IT specialists to play with Hadoop. "Big data is growing, and getting harder to manage," Grocott said. ", Hadoop is still in the early adopter phase, Grocott said. Isilon Hadoop Tools. This reference architecture provides hot tier data in high-throughput, low-latency local storage and cold tier data in capacity-dense remote storage. Unique industry intelligence, management strategies and forward-looking insight delivered bi-monthly. Architecture, validation, and other technical guides that describe Dell Technologies solutions for data analytics. Isilon Isilon OneFS uses the concept of an Access Zone to create a data and authentication boundary within OneFS. Receive notification when applications open for lists and awards. It is not really so. Given the same amount of spindles, HW would definitely cost smaller than the same HW + Isilon licenses. The Apache Hadoop project is a framework for running applications on large clusters built using commodity hardware. From my experience, we have seen a few companies deploy traditional SAN and NAS systems for small-scale Hadoop clusters. You can deploy the Hadoop cluster on physical hardware servers or on a virtualization platform. This is counter to the traditional SAN and NAS platforms that are built around a âscale upâ approach (ie few controllers, add lots of disk). The new system also works with all industry-standard protocols, Kirsch said. ( Log Out / More importantly, Hadoop spends a lot of compute processing time doing âstorageâ work, ie managing the HDFS control and placement of data. A great article by Andrew Oliver has been doing the rounds called âNever ever do this to Hadoopâ. I want to present a counter argument to this. "Our goal is to train our channel partners to offer it on behalf of EMC. isilon_create_users creates identities needed by Hadoop distributions compatible with OneFS. All language bindings are available for download under the 'Releases' tab. Dedupe â applying Isilonâs SmartDedupe can further dedupe data on Isilon, making HDFS storage even more efficient. Customers trust their channel partners to provide fast implementation and full support. "Big data" is data which scales to multiple petabytes of capacity and is created or collected, is stored, and is collaborative in real time. Each Access Zone is IT channel news with the solution provider perspective you know and trust sent to your inbox. Unfortunately, usually it is not so and network has limited bandwidth. The question is how do you know when you start, but more importantly with the traditional DAS architecture, to add more storage you add more servers, or to add more compute you add more storage. Sub 100TBs this seems to be a workable solution and brings all the benefits of traditional external storage architectures (easy capacity management, monitoring, fault tolerance, etc). The Isilon solves these problems with its architecture and also allows processing of data that was written to the Isilon over a different protocol without a second import process. Isilon brings 3 brilliant data protection features to Hadoop (1) The ability to automatically replicate to a second offsite system for disaster recovery (2) snapshot capabilities that allow a point in time copy to be created with the ability to restore to that point in time (3) NDMP which allows backup to technologies such as data domain. And this is really so, the thing underneath is called “erasure coding”. For Hadoop analytics, the Isilon scale-out distributed architecture minimizes bottlenecks, rapidly serves big data, and optimizes performance for analytics jobs. With Dell EMC Isilon, namenode and datanode functionality is completely centralized and the scale-out architecture and built-in efficiency of OneFS greatly alleviates many of the namenode and datanode problems seen with DAS Hadoop deployments during failures. A great example is Adobe (they have an 8PB virtualized environment running on Isilon) more detail can be found here: Boni is a regular speaker at numerous conferences on the subject of Enterprise Architecture, Security, and Analytics. Solution architecture and configuration guidelines are presented. The net effect is that generally we are seeing performance increase and job times reduce, often significantly with Isilon. Begin typing your search above and press return to search. The tool can be found here: https://mainstayadvisor.com/go/emc/isilon/hadoop?page=https%3A%2F%2Fwww.emc.com%2Fcampaign%2Fisilon-tco-tools%2Findex.htm, The DAS architecture scales performance in a linear fashion. With â¦ Hadoop data is often at risk because it Hadoop is a single point-of-failure architecture, and has no interface with standard backup, recovery, snapshot, and replication software, he said. Because Hadoop is such a game changer, when companies start to production-ise it, the platform quickly becomes an integral part of their organization. For Hadoop analytics, Isilonâs architecture minimizes bottlenecks, rapidly serves petabyte scale data sets and optimizes performance. EMC Isilon's new OneFS 6.5 operating system with native integration of the Hadoop Distributed File System (HDFS) protocol provides a scale-out platform for big data with no single point of failure, Kirsch said. Hadoop implementations also typically have fixed scalability, with a rigid compute-to-capacity ratio, and typically wastes storage capacity by requiring three times the actual capacity of the data for use in mirroring it, he said. The unique thing about Isilon is it scales horizontally just like Hadoop. Every node in the cluster can act as a namenode and a datanode. file copy2copy3 . At the current rate, within 3-5 years I expect there will be very few large-scale Hadoop DAS implementations left. ( Log Out / A number of the large Telcos and Financial institutions I have spoken to have 5-7 different Hadoop implementations for different business units. The traditional SAN and NAS architectures become expensive at scale for Hadoop environments. Most of Hadoop clusters are IO-bound. EMC ISILON HADOOP STARTER KIT FOR IBM BIGINSIGHTS 6 EMC Isilon Hadoop Starter Kit for IBM BigInsights v 4.0 This document describes how to create a Hadoop environment utilizing IBM® Open Platform with Apache Hadoop and an EMC® Isilon® scale-out network-attached storage (NAS) for HDFS accessible shared storage. ", IBM’s Jim Whitehurst On Why Red Hat Wins vs. VMware, HPE, NetApp CEO George Kurian: All-Flash, Hybrid Cloud Trends Point To A Bright Future, StorCentric Plays A New Tune With Violin Systems Acquisition, Pure Storage Adds New Partner Community, Tools, Services, NetApp Updates Storage Software, Services, Hardware With Eye On Cloud. Thus for big clusters with Isilon it becomes tricky to plan the network to avoid oversubscription both between “compute” nodes and between “compute” and “storage”. "We offer a storage platform natively integrated with Hadoop," he said. Network. Capacity. Running both Hadoop and Spark with Dell Isilon back-end architecture. But now this “benefit” is gone with https://issues.apache.org/jira/browse/HDFS-7285 – you can use the same erasure coding with DAS and have the same small overhead for some part of your data sacrificing performance, 3. In addition, Isilon supports HDFS as a protocol allowing Hadoop analytics to be performed on files resident on the storage. This Isilon-Hadoop architecture has now been deployed by over 600 large companies, often at the 1-10-20 Petabyte scale. Each node boosts performance and expands the cluster's capacity. By infusing OneFS, it brings value-addition to the conventional Hadoop architecture: The Isilon cluster is independent of HDFS, and storage functionality resides on PowerScale. Cost will quickly come to bite many organisations that try to scale Petabytes of Hadoop Cluster and EMC Isilon would provide a far better TCO. EMC is looking to overcome those limitations by implementing Hadoop natively in its Isilon scale-out NAS appliance, Kirsch said. This Isilon-Hadoop architecture has now been deployed by over 600 large companies, often at the 1-10-20 Petabyte scale. A great example is Adobe (they have an 8PB virtualized environment running on Isilon) more detail can be found here: https://community.emc.com/servlet/JiveServlet/previewBody/41473-102-1-132603/Virtualizing%20Hadoop%20in%20Large%20Scale%20Infrastructures.pdf. Apply For the Managed Service Providers 500, Apply For Next-Gen Solution Provider Leaders, Dell Technologies Storage Learning Center, Symantec Business Security Learning Center, Dell Technologies World Digital Experience 2020. Hadoop consists of a compute layer and a storage layer. So how does Isilon provide a lower TCO than DAS. For Hadoop analytics, the Isilon scale-out distributed architecture minimizes bottlenecks, rapidly serves large data sets, and optimizes performance for MapReduce jobs. However once these systems reach a certain scale, the economics and performance needed for the Hadoop scale architecture donât match up. Good points 0x0fff. One of the downsides to traditional Hadoop is that a lot of thought has to be put into how to place data for redundancy and the name node for HDFS is NOT redundant. Fill in your details below or click an icon to log in: You are commenting using your WordPress.com account. In this case, it focused on testing all the services running with HDP 3.1 and CDH 6.3.1 and it validated the features and functions of the HDP and CDH cluster. Those limitations include a requirement for a dedicated storage infrastructure, thus preventing customers from enjoying the benefits of a unified architecture, Kirsch said. I genuinely believe Isilon is a better choice for Hadoop than traditional DAS for the reasons listed in the table below and based on my interview with Ryan Peterson, Director of Solutions Architecture at Isilon. (Note: both Hortonworks and Isilon team has access to download the One company might have 200 servers and a petabyte of storage. The NameNode daemon is a distributed process that runs on all the nodes in the cluster. The result, said Sam Grocott, vice president of marketing for EMC Isilon, is the first scale-out NAS appliance which provides end-to-end data protection for Hadoop users and their big data requirements. PrepareIsilon&zone&! existing Isilon NAS or IsilonSD (Software Isilon for ESX) Hortonworks, Cloudera or PivotalHD; EMC Isilon Hadoop Starter Kit (documentation and scripts) VMware Big Data Extension. There are 4 keys reasons why these companies are moving away from the traditional DAS approach and leveraging the embedded HDFS architecture with Isilon: Often companies deploy a DAS / Commodity style architecture to lower cost. Isilon plays with its 20% storage overhead claiming the same level of data protection as DAS solution. Hadoop â with HDFS on Isilon, we dedupe storage requirements by removing the 3X mirror on standard HDFS deployments because Isilon is 80% efficient at protecting and storing data. This white paper describes the benefits of running Spark and Hadoop with Dell EMC PowerEdge Servers and Gen6 Isilon Scale-out Network Attached Storage (NAS). With Isilon you scale compute and storage independently, giving a more efficient scaling mechanism.
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