This provides built-in, extremely granular intelligence that automatically tiers data and optimizes performance while still protecting your data. Dynamic Capacity: thin provisioning Built into every Dell Compellent Storage Center system, thin provisioning delivers efficient storage utilization. Our advanced thin provisioning, called Dynamic Capacity, completely separates storage allocation from utilization, enabling users to allocate any size volume up front yet only consume physical capacity on write. You can even reclaim capacity that is no longer in use by applications, automatically reduce the space needed for virtual OS volumes and convert traditional volumes on existing storage to thin-provisioned capacity. Data Progression: Automated tiered storage Based on actual use and performance requirements, Dell Compellent Data Progression automatically classifies and migrates data to the optimum tier and RAID level.
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Our review sample of the latest Storage Center 6. The first tier comprises high performance drive arrays for fast access to hot data and in the majority of usage cases, will be made up of 15K SAS drives. As data becomes less used it is migrated down the tiers eventually arriving at high capacity 7K SAS drives for a commensurate reduction in storage costs.
Migration is a two-way street as data that gains in popularity is moved back up the tiers. It maintains details such as the number of accesses, when it was written, which virtual volume it belongs to and so on. Advertisement - Article continues below DBA uses this information to determine which storage tier a data block should reside on and when to move it up or down the tiers. Consequently, a volume can contain data blocks that reside on different tiers dependent on their usage patterns.
At the lower levels RAID-6 provides dual drive redundancy for higher capacity arrays. It then places them in the most appropriate tier. Disk Folders are used to amalgamate all physical storage devices and present them as a single pool. Thin provisioning is enabled allowing virtual volumes to be much larger that the physical storage and Petabyte sizes are supported.
Most of the profile functions are now preconfigured so blocks unused for more than twelve days will be moved to a lower tier. Ratios decide how quickly blocks are moved up and down the tiers and these also now have preset values. Configured during volume creation, you set a frequency schedule and decide how many replays to keep for file versioning purposes. This reduces the number of HBAs required as if a physical port fails, the virtual port can be mapped to another on the same controller.
Server Mapping automates deployment of virtual servers and clusters whilst Consistency Groups allow fast replays to be taken of data stored on multiple volumes without impacting application performance.
The Enterprise Manager provides centralised reporting for multiple controllers and includes information on storage usage and trends. NAS support is now available with the optional FS head unit. Performance is excellent and we were also impressed with ease of deployment as most tasks are fully automated.
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