Always wanted to change Disk.SchedNumReqOutstanding per device instead of per host? Well now with vSphere 5.5 you can! I didn’t know about this either, but my colleague Paudie pointed this out. Useful feature when you have several storage arrays and you need to tweak these values, now lets be clear… I do not recommend tweaking this, but in the case you need to you can now do it per device using esxcli.
Get the current configured value for a specific device:
esxcli storage core device list --device <device>
Set the value for a specific device::
esxcli storage core device set -d <device> -O <value between 1-256>.