The total number of outstanding commands permitted from all virtual machines on a LUN is governed by the Disk.SchedNumReqOutstanding (DSNRO) configuration parameter. If the total number of outstanding commands (IO depth) from all virtual machines exceeds this parameter, the excess commands are queued in the ESXi kernel. DSNRO is the…
All ESXi versions
When SATA or SAS SSDs are used as a Cache Device, configure those behind the RAID controller in RAID 0 mode and not RAID 1 mode. This is because, when RAID 1 mode is used, the Queue Depth for the device will reduce substantially. As an example, the ‘HP Smart…
VirtuCache license key file is of the type lic_vnx2*.vib The key is installed using the below command: esxcli software vib install -v "file:///vmfs/volumes/[datastore name]/lic_vnx2*.vib" where [datastore name] is the Datastore location the vib has been copied to. In case you are updating an existing key (that might be temporary, permanent, expired,…
If the Administrator can make changes to Windows VMs, then the below set of steps will help maximize Storage throughput from within Windows VMs. Step 0 Ensure VM Tools in the Guest VM is upgraded Once VM is powered down, right click on VM. Goto ‘Edit Settings’ > ‘Options’ Tab…