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Correct Failover Mode for Clariion CX, RHEL6.2 & Volume Manager 6.0

Created: 29 Aug 2012 • Updated: 08 Oct 2012 | 1 comment
This issue has been solved. See solution.

Hello,

as mentioned in the title we are using Veritas Cluster 6.0 an therefore Veritas Volume Manger 6.0 on our Redhat 6.2 systems. A Clariion CX4-240 storage system provides some LUNs' for the servers. Everything is working fine apart from several I/O errros in the messages:

Aug 29 16:17:44 nwj8cnp001 kernel: end_request: I/O error, dev sdp, sector 0
Aug 29 16:17:44 nwj8cnp001 kernel: sd 8:0:5:0: [sdp] Device not ready
Aug 29 16:17:44 nwj8cnp001 kernel: sd 8:0:5:0: [sdp] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
Aug 29 16:17:44 nwj8cnp001 kernel: sd 8:0:5:0: [sdp] Sense Key : Not Ready [current]
Aug 29 16:17:44 nwj8cnp001 kernel: sd 8:0:5:0: [sdp] Add. Sense: Logical unit not ready, manual intervention required
Aug 29 16:17:44 nwj8cnp001 kernel: sd 8:0:5:0: [sdp] CDB: Read(10): 28 00 3e 7f ff f8 00 00 08 00

All devices listed in the messages concern the secondary paths of the LUNs'.

We are using Failover Mode 1, does anyone know if this is causing those error messages? I have found the following information in an EMC document:

Failovermode may be set to 4 for ALUA behavior, or
Failovermode may be set to 1 for active/passive behavior

Do we have to change to Failovermode 4?

Regards,

Martin

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