ESXi 5.0 supports SSD disk. What does it mean?
You might already rememeber some hints on SSD support prediction in the past on this blog.Yes, ESX now officially support SSD disks.With this support user now can plugin SSD into ESX ( vsphere5.0 onwards), and configure ESX to use the same for caching or storing VM swap files.To utilize the SSD disk for holding caching purpose , you need to create a datastore on the device and then you can select the %-age space to use it for esxi caching from 1-100%. You can observe the ESXi performance better then its predecessor.
That said here is the catch.Some times even though the disk is SSD ESXi can not recognize the disk as SSD. There is a reason for that, if the disk attached to raid controller , few raid controllers donot give ESX the access to the mode page ,to determine whether the device behind the RAID is SSD or not. In such cases where device does not show up as SSD we have a provision to Tag/Enable the disk as SSD. We can as certain claimrules in ESX for the disk which we are sure to be a SSD. You can also mark a magetic disk as SSD using this method for testing.
This can be done using the PSA claim rules,
# esxcli nmp satp addrule --satp VMW_SATP_ALUA_CX -t vendor -V DGC -M "RAID 0" --option="enable_ssd"
--satp = SATP which claims the device
Note: you can get the device satp by
"esxcli storage nmp device list"
vendor -- vendor of the device
model -- Model of the device
Instead of using vendor/model there are different options available in esxi 5.x to add SATP Claimrules.
You can use device,transport....etc.
You might already rememeber some hints on SSD support prediction in the past on this blog.Yes, ESX now officially support SSD disks.With this support user now can plugin SSD into ESX ( vsphere5.0 onwards), and configure ESX to use the same for caching or storing VM swap files.To utilize the SSD disk for holding caching purpose , you need to create a datastore on the device and then you can select the %-age space to use it for esxi caching from 1-100%. You can observe the ESXi performance better then its predecessor.
That said here is the catch.Some times even though the disk is SSD ESXi can not recognize the disk as SSD. There is a reason for that, if the disk attached to raid controller , few raid controllers donot give ESX the access to the mode page ,to determine whether the device behind the RAID is SSD or not. In such cases where device does not show up as SSD we have a provision to Tag/Enable the disk as SSD. We can as certain claimrules in ESX for the disk which we are sure to be a SSD. You can also mark a magetic disk as SSD using this method for testing.
This can be done using the PSA claim rules,
# esxcli nmp satp addrule --satp VMW_SATP_ALUA_CX -t vendor -V DGC -M "RAID 0" --option="enable_ssd"
--satp = SATP which claims the device
Note: you can get the device satp by
"esxcli storage nmp device list"
vendor -- vendor of the device
model -- Model of the device
Instead of using vendor/model there are different options available in esxi 5.x to add SATP Claimrules.
You can use device,transport....etc.
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