Western Digital Tegile T4100
Hybrid Flash Storage Array for Balanced Performance and Capacity
Performance of Flash at the Price of Disk
Western Digital Tegile offers an extensive line of hybrid arrays as part of the IntelliFlash portfolio. Western Digital Tegile hybrid storage arrays leverage the performance of flash, the density of hard disks and the rich features of IntelliFlash™ operating system to deliver a compelling storage platform that accelerates a wide variety of workloads in the enterprise.
Fully redundant with active/active controllers, these arrays are built for enterprise datacenters with resilience, data availability and data protection in mind. With Western Digital Tegile hybrid arrays, you no longer have to compromise between performance, capacity and cost for accelerating and protecting your enterprise applications.
|Flash as % of Total Usable Capacity||10% Flash||30% Flash||60% Flash|
|Raw Flash Storage (Min)*||1.5TB||5.8TB||17.3TB||34.6TB||24.5TB||51.8TB|
|Raw Disk Storage (Min)*||26TB||52TB||52TB||104TB||26TB||52TB|
|Effective All-Flash Capacity** (Min / Max)||N/A||N/A||43TB - 939TB||86TB - 804TB||86TB - 983TB||173TB - 1065TB|
|Effective Hybrid Capacity** (Min / Max)||60TB - 780TB||120TB - 840TB||120TB - 720TB||240TB - 720TB||60TB - 660TB||120TB - 720TB|
|Form Factor (Rack Units)||3U||5U||8U||5U|
|Protocols||SAN Protocol Support (iSCSI, Fibre Channel), NAS Protocol Support (NFS, CIFS, SMB 3.0)|
|Data Services||Inline Deduplication, Compression, Thin Provisioning, Snapshots, Remote Replication, Application Profiles|
|Management||Web browser, plug-ins for VMware vCenter and Microsoft System Center VM Manager, SSH, IP-KVM, SNMP|
|Cloud Management||IntelliCare™ cloud analytics and proactive support available with Standard and Premier support programs|
|Data Security||Inline 256-bit AES Encryption for Data-at-Rest|
|Redundancy||No single point of failure, Active-Active High Availability Architecture, Dual-ported storage media|
Accelerating Reads & Writes with IntelliFlash:
Western Digital Tegile Intelligent Flash Arrays enable enterprises to strike the perfect balance between performance and capacity. Each array is powered by the IntelliFlash™ software architecture. IntelliFlash gives you the flexibility to use all flash or a mixture of flash and disk. The software architecture intelligently manages the different storage media to deliver optimized performance and capacity.
This technology brief explains how IntelliFlash accelerates the read and write process within a Western Digital Tegile hybrid array.
Performance & Capacity Layers
Within each Western Digital Tegile array, there is a performance storage layer and a capacity storage layer. In the performance layer, there's a combination of DRAM and flash. This gives you the high performance and low latency you need for your virtual server, VDI, messaging, collaboration, and database applications. The capacity layer takes full advantage of the evolution in media densities. It accommodates spinning hard disk drives today and is designed to be flexible enough to accommodate emerging storage media as they become available.
All Western Digital Tegile arrays come with dual controllers. Multiple storage pools can be created within the Western Digital Tegile array. These storage pools can be all-flash (FlashVols) or a combination of flash and hard disk. A storage pool at any given point in time is associated with one of the two controllers. Both controllers can be used simultaneously by associating different pools to each controller.
In the event of a controller failure, or for live software upgrades, the associated pools can be failed-over transparently—with no perceived outage.
All writes to the Western Digital Tegile array are synchronous. The moment the data is received, it's saved to a persistent "Write Cache" in flash and an acknowledgement is sent back to the host. Round trip, that whole process takes a millisecond or less.
To optimize the IO path, IntelliFlash dedicates a portion of the performance layer exclusively for metadata. This includes block pointers, deduplication signatures, compression type, and the like. All of the metadata is organized, aggregated, and remains in this dedicated, persistent section within performance layer. This performance- optimization technique stands in stark contrast to traditional storage systems, which intersperse metadata with the rest of the data on disk. Over time, as data inevitably gets modified, deleted, and rewritten, the metadata becomes very fragmented, which negatively impacts performance.
IntelliFlash also performs inline compression and deduplication. These data reduction techniques can not only shrink your storage footprint by up to 90 percent, they also act as performance multipliers by freeing up space in the performance layer for faster reads and writes.
Each data block is compressed and redundant data blocks are removed before they are written to disk. You can choose the compression rate and turn on/off deduplication at the volume level to strike the perfect balance between speed and capacity.
The resulting unique data blocks are coalesced and streamed sequentially to the capacity layer. After that happens, the data is removed from the "Write Cache" and the process is complete.
Intelligent caching algorithms keep the most frequently accessed data in the Read Cache, which resides on DRAM and flash. These caching algorithms are optimized for various I/O patterns and dynamically adapt to differing media latencies across multiple levels of cache.
There are two levels of Read Cache in a Western Digital Tegile array. Both are self-tuning. The first level is the primary DRAM cache. This is smaller and faster. The second level resides on flash.
The array proactively fetches and populates the read cache with the hottest data. This all happens dynamically — in real time using intelligent, pre-fetch algorithms — without user intervention.
In most customer cases, the cache-hit ratio is well over 90%. That means that most read requests are satisfied from DRAM and flash.
Western Digital Tegile Intelligent Flash Arrays use IntelliFlash to intelligently manage different types of media to deliver incredibly fast performance while also maximizing capacity and keeping your storage costs in check. For more information on how IntelliFlash can help accelerate your applications, check and visit IntelliFlash page.
What is the deal with Flash?
Flash is dramatically faster and uses less energy and space than traditional disk-based storage and is perfect for those applications that require performance. However disk-based storage isn't going away just yet and is still great for those applications where low-cost and high capacity trumps performance.
All-Flash can be expensive but in applications where performance and latency are critical, All-Flash is the way to go.
A hybrid flash system that mixes flash with low cost disks is ideal for most enterprise workloads.
Traditional disk-based storage is low cost but has high latency, low IOPs and uses more energy and rackspace as capacity grows.
What is the deal with latency?
Really important when you need fast reliable performance.
Western Digital Tegile Systems offers both an All Flash and Hybrid storage solution so you won't hear us taking a stand on one versus the other. We work with our customers to understand their application workloads and storage requirements before making a recommendation on whether All-Flash or Hybrid is the ideal solution.
Western Digital Tegile All-Flash Storage Arrays
Western Digital Tegile All-Flash Storage Arrays feature high density enterprise flash solid state drives designed to support missioncritical applications that require extremely high performance at low latency for extend periods of time.
Western Digital Tegile Hybrid Storage Arrays
Western Digital Tegile Hybrid Flash Storage Arrays deliver a perfect balance of data management, performance and economics by providing a flexible amount of high density flash solid state drives and metadata accelerated high density hard disk storage.
Download the Western Digital Tegile IntelliFlash Product Matrix (PDF).
Download the Western Digital Tegile IntelliFlash T-Series Storage Arrays Datasheet (PDF).