The ioVDI software is typical, in one sense, of many VDI-accelerating products, using server-side flash caching to speed the system's responsiveness. Fusion-io says its product is better than the rest (storage consultancy ESG reckons it comes in at under $125/desktop) and it features:Write Vectoring to monitor and direct transient, session-based desktop writes to server flash, with persistent desktop writes are sent to shared storage Transparent File Sharing to enable many hosted virtual desktops to simultaneously share common files. This accelerates reboot times Dynamic flash reallocation optimises flash performance across desktops during migration instances Fusion-io states that "by limiting shared storage interaction to the small number of writes that persist between login sessions, Write Vectoring preserves the use of VMware value-added features such as vMotion, HA, DRS, and SRM that require shared storage while substantially reducing SAN or NAS performance dependencies."

An ESG validation document says: "Write vectoring recognises the existence of transient desktop writes that never need persistence, including page file I/O, temporary files, and browser temp data. Essential desktop writes such as auto-saves and user data updates are directed as expected to shared storage for protection and HA."Concerning Transparent File Sharing (TFS) it says: "VMware Horizon View Storage Accelerator can use up to 2GB of RAM [and] Transparent File Sharing optimises performance by rapidly sharing common files throughout the VDI infrastructure."Excellent performance in a 1,000 seat virtual desktop environment built using low-end commodity NFS storage over legacy 1Gb Ethernet Consistent, predictable response times of less than 200 microseconds as measured with Login VSI over multi-hour test runs. A Windows 7 desktop accessed from an iPad was extremely responsive Back-end storage traffic was reduced by 90 per cent overall, measured at the disk, with 60 per cent of write traffic offloaded from the back-end storage Fast, consistent boot times under full load of 8-12 seconds, while running 1,000 desktops Boot times and desktop responsiveness were observed to be faster than an SSD-equipped laptop "Fusion ioVDI delivers the persistence, performance, and HA of storage-side solutions with the cost-effectiveness and simple deployment model inherent in server-side solutions," according to ESG. The consultants also think Fusion-io best practice is to pair ioVDI with dedupe-capable primary storage which is also compliant with vStorage API for Array Integration (VAAI).

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