I was running a health check on a customers Nutanix cluster this week and found a newer item that Nutanix Cluster Check (NCC) checks for. Its called “esx_sioc_status_check”. This item was added in NCC 2.2.5
Nutanix has stated for years that Storage I/O Control (SIOC) is not needed or recommended on datastore containers. The reason for this is due to how write I/O is serviced by every Nutanix CVM in the cluster – while 90-95% of read I/O is done on he local CVM. We are seeing more vendors call this “Data Locality” – side note: Nutanix has been talking about Data Locality for years and its advantages.
Nutanix now has now went a step further to ensure that SIOC stats are now disabled (Nutanix KB3358). SIOC is disabled by default, however, SIOC stats collection is enabled by default.
To disable SIOC or SIOC stats mode, do the following:
- Go to the vSphere Web Client and Log in
- Go to Storage View – Select the Datastore / Container – Manage – Settings and if SIOC is enabled, disable SIOC
- Select the “Disable Storage I/O statistics” check box to disable SIOC in stats mode.