After SAN switch replacement, randomly multipath shows different path counts for the LUNs from storage.

Solution Verified - Updated -

Issue

  • Recently the SAN switch was replaced. Now multipath shows 8 active paths but sometimes it shows only 4 active paths. Number of active paths changes randomly.

Following errors are seen in messages log file :

Aug 27 07:41:37 host1 kernel: qla2xxx [0000:06:00.0]-1020:1: **** Failed mbx[0]=4005, mb[1]=22, mb[2]=2372, mb[3]=5100, cmd=31 ****.
Aug 27 07:41:37 host1 kernel: qla2xxx [0000:06:00.0]-706d:1: Unable to read SFP data (102/a0/0).
Aug 27 07:41:37 host1 kernel: qla2xxx [0000:06:00.1]-1020:2: **** Failed mbx[0]=4005, mb[1]=22, mb[2]=235c, mb[3]=d100, cmd=31 ****.
Aug 27 07:41:37 host1 kernel: qla2xxx [0000:06:00.1]-706d:2: Unable to read SFP data (102/a0/0).

Environment

  • Red Hat Enterprise Virtualization Hypervisor release 6.4

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