Benefits of Multi-Node Scale-out Clusters running NetApp Clustered Data ONTAP. Silverton Consulting, Inc. StorInt Briefing
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1 Benefits of Multi-Node Scale-out Clusters running NetApp Clustered Data ONTAP Silverton Consulting, Inc. StorInt Briefing
2 BENEFITS OF MULTI- NODE SCALE- OUT CLUSTERS RUNNING NETAPP CDOT PAGE 2 OF 7 Introduction NetApp has been a leader in scale- up and scale- out unified storage for years now, and recent enhancements to FAS and All Flash FAS (AFF) storage hardware as well as clustered Data ONTAP (cdot) have only helped to extend their lead. Current cdot clusters support up to 24 nodes [12 high availability (HA) pairs] of network- attached storage (NAS) or 8 nodes (4 HA pairs) of storage area network (SAN) systems. NetApp currently offers some of the most impressive scale- up and scale- out capabilities in enterprise storage today. Given all of the scale- out/scale- up flexibility that NetApp provides, customers sometime have difficulty deciding whether to use cdot clusters built of fewer nodes with higher- end storage or more nodes with mid- range storage systems. As the following discussion shows, data centers are better served with clusters that contain more nodes of mid- range storage than an equivalent capacity configured with fewer cluster nodes of higher- end storage or dual controller scale- up systems from other vendors. Scale-out storage with NetApp cdot A multi- node cdot cluster configuration consists of FAS and AFF storage system HA pairs. NetApp family of products includes the new All Flash FAS (AFF) series (AFF8020, AFF8040, AFF8060 and AFF8080 EX) providing higher IOPS and consistent low latency of flash technology, the FAS8000 series (FAS8020, FAS8040, FAS8060 and FAS8080 EX) for enterprise storage applications, and the entry FAS2500 series (FAS2520, FAS2552 and FAS2554). In this discussion, a two- node (one HA pair) NetApp cluster or a dual controller competitive scale- up system will be compared with a four- node (two HA pairs) NetApp cluster. In the four- node configuration, one HA pair could be all- flash storage, while the other pair could be configured using hybrid [disks using solid state drives (SSDs) as cache] or disk- only storage. Such a cdot cluster can supply a wide variety of IO performance to better match storage services to applications that need them across the data center. The two- node configuration could also have both nodes configured as all- flash or hybrid storage. However, fewer nodes mean less flexibility in configuring storage performance across the cluster. In both cluster configurations, HA pairs provide data availability and system redundancy through mutual failover functionality for the alternate node in the pair s storage configuration. HA pairs are needed to support online cluster operations such as non- disruptive upgrades under cdot.
3 BENEFITS OF MULTI- NODE SCALE- OUT CLUSTERS RUNNING NETAPP CDOT PAGE 3 OF 7 Capacity and performance utilization benefits of four-node cdot clusters One advantage of more nodes in a cluster is that storage capacity and performance can be allocated at a finer granularity across the cluster. With a two- node cluster or a competitor s dual- controller storage, data and corresponding workloads can be moved only from one side of a controller pair to the other. However, with a four- node cluster work can be migrated to any of the other three nodes providing more flexibility. Under NetApp s cdot, administrators can easily move data from one node to another without disruption, even while data is accessed by a server. As such, cdot s ease of data movement and more nodes with diverse storage configurations enables customers to more readily match workload IO and capacity requirements to cluster node capabilities. For example, capacity utilization might be a rationale for migrating data around the cluster, with the goal of achieving 60% capacity use across all cluster nodes. Alternatively, IO performance can be balanced across a cluster without taxing any one node with more than 50% of its potential IO rate. Either rationale for balancing workload requirements would be considerably easier to implement with more nodes than with fewer nodes. System capacity can also be varied across the nodes in a cluster, such that slower storage nodes have more capacity and faster, all- flash nodes have less capacity. In this fashion, perhaps 20-30% of overall cluster capacity could be in all- flash storage, with the remaining capacity divided up between hybrid and disk- only storage. Again, more nodes provide much more flexibility as to how to configure both performance and capacity across the cluster while also better matching workload requirements to storage nodes. Resiliency benefits of four-node cdot clusters NetApp FAS and AFF storage supports a number of data protection and storage resiliency options, such as SnapVault (for backup/restore and long term retention), SnapMirror (for asynchronous disaster recovery) and MetroCluster (for synchronous disaster recovery). With these solutions, administrators establish a pairwise connection between a volume, aggregate or system node in one HA pair with a volume, aggregate or system node in another HA pair.
4 BENEFITS OF MULTI- NODE SCALE- OUT CLUSTERS RUNNING NETAPP CDOT PAGE 4 OF 7 For example, one node in an HA pair could be configured as a SnapVault repository for another HA pair, a single node or even multiple nodes (for fan- in ). Similarly, SnapMirror replication could be used between the HA pairs, and additional SnapMirror associations could be configured between HA pairs at this site to other HA pairs located at two other separate sites, providing a three- way data protection scheme across three separate cdot clusters. The additional SnapVault and SnapMirror capabilities made available by the four- node cluster can address just about any data protection need a data center might have. Moreover, SnapMirror and SnapVault can be used together to cascade replication to multiple sites. Since they both use the same underlying software engine, SnapMirror and SnapVault share a single data stream and repository for both backup and DR, saving on both bandwidth and target storage capacity. As such, this architecture also makes possible recovery from corruption in the primary storage. Normally, corruption in primary storage will be commonly replicated to its mirror before discovery. However, with the new unified engine, one can now select a prior, point- in- time copy from the SnapVault repository that predates the corruption, and fail over to that copy. This feature is available both when used intra- cluster as well as between clusters and across sites. Another significant differentiator for SnapMirror and SnapVault is that they store the replicated data in native storage format, which allows customers to use space- efficient, FlexClone copies of data for development and test without impacting production activity. In addition, one can test DR failover without breaking the mirror, by failing over to a FlexClone, which enables more frequent DR testing, even during production hours. In cdot 8.3.1, NetApp now offers SnapMirror at the Storage Virtual Machines (SVM) level, with the creation of a single replication policy for an entire SVM. In addition, SnapMirror for SVM is highly automated, such that any changes to the SVM are automatically replicated to the target. For instance, with SnapMirror SVM management, one no longer has to modify replication policies as volumes and LUNs are added/moved/resized/deleted within an SVM. This works well for managing DR in a multi- tenancy environment, and managing large volumes of LUNs and volumes by grouping them into a number of smaller SVMs, resulting in fewer replication policies to manage. MetroCluster in a cdot configuration provides dual- site redundancy by mirroring HA pair storage across sites and supplying zero data loss, with near- instant data availability for site outages. MetroCluster offers non- disruptive operations beyond one data center. MetroCluster requires minimal ongoing management once set up, as any changes made on one site are automatically implemented on the mirror site, whether that be creating, resizing or moving a LUN or a volume (since NAS is also supported), and even creating a Snapshot copy. And since it s built- in to cdot, there are no external software or hardware to set up and manage, and it works seamlessly with the rest of cdot functionality. The result is a low- cost, DR solution that is easier to implement and manage.
5 BENEFITS OF MULTI- NODE SCALE- OUT CLUSTERS RUNNING NETAPP CDOT PAGE 5 OF 7 Performance benefits of four-node cdot clusters In the event of a failing controller or non- disruptive upgrade, the IO performance of a four- node cluster is less subject to performance degradation than a two- node cluster or a dual controller scale- up system from other vendors. A two- node cluster or dual controller system would lose 50% of its IO performance (one of the two controllers offline), whereas a four- node cluster would lose only 25% (one of four controllers offline) of cluster IO performance. As discussed earlier, four- node clusters have a natural advantage when it comes to spreading IO performance across multiple nodes. If some workloads demand extremely high IO performance, it s relatively straightforward to use storage from an all- flash node while also using hybrid storage nodes to service other workloads that don t need as much IO performance. Why segregate application performance by storage node? In a network- shared storage environment, applications can sometimes suffer from noisy neighbor problems, a condition where one application consumes most or all of the performance of a storage node, leaving little for other applications. Isolating IO- intensive workloads to their own storage nodes can minimize and even eliminate most noisy neighbor problems. Having more nodes in a cdot cluster means more of these IO intensive workloads can be isolated from one another and from other less- IO- intensive workloads. Another reason more cluster controllers can improve performance is that with all flash arrays, SSDs can sometimes overpower a single controller with their high performance. In this event, spreading the same number of SSDs over more controllers or controller pairs can increase IO performance by reducing controller congestion. In addition, internal NetApp testing has determined that overall controller CPU utilization is lower when running a typical data center workload in a cdot cluster of four nodes than with two nodes of higher- end FAS storage with equivalent capacity. As a result, the four- node cluster has more spare compute power to perform data protection services or cdot data efficiency services, such as data compression or deduplication, which allows more user data to be stored within the same physical storage capacity. Furthermore, recent NetApp internal OLTP (SAN) testing and externally validated SPECsfs (NAS) benchmarks indicate that NetApp cdot IO performance scales linearly with storage nodes for both SAN and NAS protocols. That is, using the same FAS storage models, a four- node cdot cluster offers approximately two times the performance of a two- node storage cluster of equivalent capacity on various IO workloads. A four- node AFF configuration can include more SSDs than a single HA pair of a higher end AFF. Configuring all HA- pairs with AFF storage would lead to even more low latency and higher IO performance for a four- node cluster.
6 BENEFITS OF MULTI- NODE SCALE- OUT CLUSTERS RUNNING NETAPP CDOT PAGE 6 OF 7 As shown in Figure 1, NetApp was named our Champion of Champions for enterprise- class online transaction processing (OLTP) performance for the first quarter of Figure 1 Silverton Consulting enterprise- class OLTP ChampionsChart for 1Q Other configuration benefits of four-node cdot clusters Another advantage of the four- node cdot cluster is that the data center can use NetApp FlexArray storage virtualization running on a FAS8000 HA pair to bring other, non- NetApp external storage arrays under cdot control. For example, the cluster s higher- performing nodes could be configured as SAN storage for mission- critical applications, while the slower performing nodes could use FlexArray virtualization to incorporate external storage systems within NetApp cdot cluster management. NetApp FlexArray integrates external storage within the cluster and allows the use of cdot advanced storage capabilities with other vendor s storage arrays. For FlexArray installations, cdot non- disruptive data mobility can be used to move external storage data across cluster nodes. FlexArray virtualization, together with online data mobility, can be very advantageous when replacing older storage systems with newer hardware. Again, having more nodes in the cdot cluster provides more options as to how to deploy FlexArray virtualization across the cluster.
7 BENEFITS OF MULTI- NODE SCALE- OUT CLUSTERS RUNNING NETAPP CDOT PAGE 7 OF 7 Application benefits of four-node cdot clusters Oftentimes, enterprise customers have suites of applications such as Microsoft Exchange, SQL Server and SharePoint. Despite their different IO activity profiles, these applications interoperate to provide an integrated solution. In a four- node cluster, these applications could easily be split across nodes to isolate and insulate their respective IO workloads. Similarly, any application suite that depends on multiple Oracle databases could be readily split across storage nodes to better isolate its activity. Even applications that depend on the same data, such as a single Oracle database and its log or journal files, could be split across cluster nodes to improve performance and database resiliency. Having four nodes vs. two nodes affords more versatility in storage node configurations that IT staff can use to better match application data to cluster nodes. Scale-up vs. scale-up/scale-out storage architectures Most NetApp competitors provide scale- up, dual controller storage solutions. These storage systems can only add cache, storage, or IO ports but would necessitate a system swap, with corresponding data migration, to improve performance beyond the original system s capabilities. With NetApp s scale- up/scale- out cdot offerings, storage can be scaled- up like the competition, but also can be scaled- out by just adding more HA- pairs of NetApp storage. Those additional nodes, add both IO performance AND capacity to the whole cdot cluster, which can then be used to spread out a data center s current IO workload across more nodes or add other IO workloads to the cluster. Summary A similarly equipped four- node cdot cluster - leveraging either FAS or AFF nodes, or both - has more utilization flexibility, added resiliency and better FlexArray virtualization adaptability than a two- node cdot cluster or other vendors dual controller scale- up systems. IO performance and application isolation advantages also come with using a four- node over a two- node cdot cluster. All these advantages make deploying a four- node cdot cluster a superior alternative to a two- node cluster of equivalent capacity. Indeed, the case is clear: purchasing a four- node cdot cluster makes much more sense than a two- node cluster or traditional, scale- up, dual controller storage systems. Silverton Consulting, Inc., is a U.S.-based Storage, Strategy & Systems consulting firm offering products and services to the data storage community.
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