Use PowerCLI to mark disk as as SSD

I’ve recently been working with a few new ESXi hosts. These systems have a pair of solid state disks that I planned to use for host cache. However, ESXi 5.0 did not detect these disks as an SSD type. I found a couple articles describing how to trick ESXi into thinking a data store was SSD:

Yellow-Bricks: Swap to host cache aka swap to SSD
VirtuallyGhetto: How to Trick ESXi 5 in seeing an SSD Datastore

After confirming with my third party vendors that this was a supported configuration, I tested and confirmed that using the enable_ssd option would resolve my issues. Since my host build script is written in PowerCLI, I wanted to re-write the vMA commands using Get-EsxCli.

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$localDisk = Get-ScsiLun | where {$_.ExtensionData.DisplayName -match "Local LSI Disk"}
$canName = $localDisk.CanonicalName
$esxcli = Get-EsxCli
$satp = ($esxcli.storage.nmp.device.list() | where {$_.Device -eq $canName }).StorageArrayType
$esxcli.storage.nmp.satp.rule.add($null,$null,$null,$canname,$null,$null,$null,"enable_ssd",$null,$null,$satp,$null,$null,$null)
$esxcli.storage.core.claiming.reclaim($canName)

The local VMFS data store needs to be created first. I encountered some errors when running the commands against an unformatted/RAW device.

One comment

  1. [...] Brian Wuchner article on how to do this through PowerCLI - http://enterpriseadmins.org/blog/scripting/use-powercli-to-mark-disk-as-as-ssd/ Joe Keegan has developed a couple of nice PowerCLI scripts to make using this with Host Caching [...]

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