White Papers

Assurance Fault Detection Isolation Recovery (FDIR) - design for three plus year near- zero maintenance

Data center managers spend too much time and resources on failed drives. With failed drives comes interruption of service, RAID rebuilds, degraded performance and the potential for double faults. Your data center can drastically improve service while reducing failed drives through the use of Assurance AVS with Fault Detection Isolation Recovery (FDIR) solution. Many storage RAID (redundant array of inexpensive disks) systems employ data replication or error correction coding to support automatic recovery of data when disk drives fail; but most still require drive maintenance. Currently, maintenance includes hot-plug drive replacement to initiate data migration and restore data from replicated sources or to initiate error correction re-coding or recovery after a single fault. Longer rebuild times increase the risk of double-fault occurrence and data loss. To minimize rebuild time and reduce the risk of data loss, replacement disk drives must be kept on hand and arrays need to be closely monitored. Given the cost of stocking replacement disk drives and operator monitoring, Assurance Inc. has researched the concept of building spare capacity into a SAID (self-maintaining array of identical disks) for fully automatic fail-in-place recovery requiring no monitoring and minimizing data loss exposure. This article provides an overview of the Assurance system's unique approach to eliminate drive tending and minimize risk of data loss for a three-year operational lifetime. This design provides superior MTTDL (mean time to data loss), high service availability, lower cost of ownership, minimal spare capacity requirements, and enables deployments with mostly unattended operation.

Assurance ApplicationSmartTM Theory of Operations and Test Results

The purpose of the ApplicationSmart software is to provide the ability to allocate solid-state storage (RAM, NVM, SSD) to a virtualized LUN (VLUN) in the AVS, and use this SSS (solid-state storage) as a write-through cache, a write-back cache, and a fast access tier for the most frequently read data to speed up overall VLUN performance. Figure XX shows the typical trade-off between storage tiers where data is migrated (moved) based upon policies like how recently it was last accessed (most often in days) and cache, where data is replicated into a RAM buffer based on frequency (or how recently) it has be used.

ApplicationSmart is focused upon IO replication up into the SSS/Flash tier, to provide cached data acceleration, both as a read cache, and as a protected write-back cache. The frequency data (and potentially time stamps) used in ApplicationSmart could likewise be used for true storage tier migration for archive applications - the main difference between tier up cache is that it replicates data, whereas tier-down ILM (Information Lifecycle Management) moves or migrates data off of the working storage tier down to slower near-line or off-line archive storage. Often ILM works only on files, but SmartTier works with sets of LBA sectors, so it can tier-up hot spots within a file as well as a set of files.

Intel Temenos Performance Testing

This documents the test results run by Intel at the Microsoft Partner Solution Center. The test was of the Temenos performance test running against Microsoft SQL Server on an NEC Express 5800 with Intel Xeon processors combined with Assurance storage.

These benchmark performance results, together with the massive scalability of Microsoft® SQL Server® 2008 R2 data management software running on the NEC Express5800/A1080a with the Intel Xeon processor 7500 series, make the combination of T24 and Microsoft® technologies using Assurance storage a viable solution for the largest banks in the world.

Assurance Video on Demand nPVR

The NCTA reports 58.5 million homes have TV cable services, 45.4 million homes have digital video, and 45.7 million have high speed internet with streaming video capability. Consumers obviously want movies to magically appear in their homes at convenient times. The dramatic rise of services such as Netflix and the death of the traditional movie rental industry demonstrate this trend. This has opened the door for Video On Demand to explode in the digital programming market as a solid revenue source.

Video On Demand (VOD) has become a staple of the premium television programming service set. In order to deliver to customers' expectations, VOD must continue to evolve so that it may provide a continuously increasing level of service. The Assurance Storage Assurance Storage SENTINEL Hs storage solution provides the scalability required to accommodate even the largest VOD system.

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