PowerFlex: System or data access instability in a VMware environment when enabling SIOC or SIOSC

One or more of the following vSphere features are enabled:

• vSphere Storage I/O Control (SIOC) on datastores residing on VxFlex OS volumes
• vSphere Storage I/O Statistics Collection (SIOSC) on datastores residing on VxFlex OS volumes

Symptoms

Symptoms may include, but are not limited to, one or more of the following:

• Occasional or prolonged VxFlex OS volume access issues, which possibly include I/O errors.
• Degraded capacity and related rebuilds.
• VxFlex OS component disconnections
• High or fluctuating volume access latency

Apart from these vSphere features being enabled, possibly no other evidence or log messages are apparent.

Due to their intended behavior, SIOC and SIOSC create an unstable and unpredictable infrastructure, unsuitable for VxFlex OS operation.

Disable SIOC and SIOSC on datastores residing on VxFlex OS volumes.

Using PowerCLI connect to vCenter and run the following command to disable it on all datastores.

$si = Get-View ServiceInstance
$storMgr = Get-View -Id $si.Content.StorageResourceManager
$spec = New-Object VMware.Vim.StorageIORMConfigSpec
$spec.Enabled = $false
$spec.StatsAggregationDisabled = $true
$spec.StatsCollectionEnabled = $false
foreach($ds in (Get-View -ViewType Datastore -Filter @{'Summary.MultipleHostAccess'='True'})){
    Write-Output "Configuring datastore $($ds.Name)"
    $storMgr.ConfigureDatastoreIORM($ds.MoRef,$spec)
}

For detailed instructions regarding how to disable these vSphere features, please refer to the relevant vSphere documentation.

See also 
PowerFlex: SIOC SIOSC NIOC are not supported

Dell PowerFlex 4.5.x Technical Overview