VSAN-Troubleshooting-Reference-Manual

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Diagnostics and Troubleshooting Reference Manual – Virtual SAN Here, ESXi 5.5U2 (which is the version of ESXi that we are running), lists a number of different device drivers. At the top of the list is version 3.2.9.1461 of the ioDriver. When vmkload_mod –s command was run on the iomemory driver for Fusion-IO, it reported a driver version of 3.2.8.1350. Although the driver is downrev from the latest version from Fusion-IO, it is still supported for Virtual SAN, as it appears second on the list above. While this earlier driver is supported, it would be strongly recommended to upgrade to the newer version to ensure all possible known issues are avoided. Walk-through results Device Vendor Model Driver Firmware Storage I/O Controller HP HP 410i PCI-E flash device FusionIO F00-001-1T20-CS- 0001 5.5.0.74- 1OEM 3.2.8 build 1350 N/A v7.1.15 The 410i controller is clearly unsupported. The FusionIO driver is down-rev. V M W A R E S T O R A G E B U D O C U M E N T A T I O N / 46
Diagnostics and Troubleshooting Reference Manual – Virtual SAN Flash considerations in version 5.5 While the focus in this scenario has been on a PCI-E flash device, there is of course full support for Solid State Disks on Virtual SAN. Of particular interest is the class of flash device. There are two classes, performance and endurance. Performance is measured in the number of writes per second, whereas endurance, in Virtual SAN 5.5, is measured in full disk writes per day (DWPD). When deciding which class of flash device to use with your Virtual SAN deployment, these are the two features that require serious consideration. Performance classes are as follows: Class Writes per second B 5,000 – 10,000 C 10,000 – 20,000 D 20,000 – 30,000 E 30,000+ Endurance classes for Virtual SAN 5.5 are as follows: Class Disk Writes Per Day A 1-5 B 5-10 C 10-20 D 20+ However for Virtual SAN 6.0, endurance is now considered using the metric TBW, or Terabytes Written. V M W A R E S T O R A G E B U D O C U M E N T A T I O N / 47
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VSAN-Troubleshooting-Reference-Manual

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