Event ID 5120 “Cluster Shared Volume ‘Volume1’ (‘Volume1’) is no longer available on this node because of ‘STATUS_IO_TIMEOUT(c00000b5)’. All I/O will temporarily be queued until a path to the volume is reestablished.” is generated on a Windows server that is a member of a Windows Server 2012 or Windows Server 2012 R2 failover cluster. All connectivity is lost to the LUN on the SAN. Access to the cluster shared volume is no longer available.
1. Ensure all network interface card (NIC) drivers and firmware are up to date.
2. Ensure all fiber host bus adapters (HBA) drivers and firmware are up to date.
3. Update the network or fiber switches to the latest firmware.
4. Update or remove any network threat protection or firewall applications installed on the server.
5. Apply the recommended hotfixes for failover clusters for Windows Server 2012. The latest hotfix at the time this solution was created can be found here.
6. Apply the recommended hotfixes for failover clusters for Windows Server 2012 R2. The latest hotfix at the time this solution was created can be found here.
7. All above does not resolve. We can remove the CSV disk on the Faileover Clustering manager and add readd