PowerStore: Overlapping I/O on a Metro volume may lead to unexpected reboot or increased latency

A node may reboot unexpectedly, or increased latency may be observed if all these conditions are present:

• PowerStoreOS 3.6.1.0
• Metro volumes
• ESXi hosts configured with access set as co-located with both systems

A software issue was introduced in PowerStoreOS 3.6.1 affecting appliances with hosts configured as Co-located with both systems only.
Due to the software issue, any overlapping I/O - I/O arriving to both appliances on the same volume on the same Logical Block Address (LBA) - may lead to an unexpected module restart or node reboot. The unexpected software module restart or node reboot may repeat until the fix or workaround is applied.

Fix

This issue is fixed in PowerStoreOS 3.6.1.1 (3.6 Service Pack 1 Patch 1) and above.

Workaround

Since this issue only affects PowerStoreOS 3.6.1.0 with hosts configured as Co-located with both systems, the following workaround is suggested:

• This procedure can be performed non-disruptively.
• On the preferred PowerStore, configure host-access to: Host is co-located with this system.
• On the non-preferred PowerStore, configure host-access to: Host is co-located with remote system.
• Example configuring on the preferred appliance.
  

Contact Dell Technical Support for additional guidance if needed.

Host connectivity can be viewed in the PowerStore Manager user interface under Compute > Host Information > HOSTS & HOST GROUPS.
For easier verification, add the Host Connectivity column to the default view: