Why multipath marked a SAN LUN subpath as active/faulty where as it's visible to system?

Solution Verified - Updated -

Issue

  • After a SAN outage, one of lun marked as active/faulty where as it's visible to system:
sda: checker msg is "tur checker reports path is down"
mpath0 (36001438005deca3f0000400076e90000) dm-0 HP,HSV400
[size=50G][features=1 queue_if_no_path][hwhandler=0][rw]
\_ round-robin 0 [prio=100][active]
 \_ 0:0:2:1 sdc 8:32  [active][ready]
 \_ 1:0:2:1 sdf 8:80  [active][ready]
\_ round-robin 0 [prio=30][enabled]
 \_ 0:0:1:1 sdb 8:16  [active][ready]
 \_ 1:0:0:1 sdd 8:48  [active][ready]
 \_ 1:0:1:1 sde 8:64  [active][ready]
\_ round-robin 0 [prio=0][enabled]
 \_ 0:0:0:1 sda 8:0   [active][faulty]   <---
  • sda is marked as active/faulty:
# multipath
sda: checker msg is "tur checker reports path is down"
/sbin/scsi_id exitted with 1
cannot get the the wwid for sda   <---
sda: checker msg is "tur checker reports path is down"
  • Following command does not show wwid of the device:
 scsi_id -g -u -s /block/sda
  • fdisk -l of the /dev/sda device shows partition tables.

Environment

  • Red Hat Enterprise Linux(RHEL) 5
  • Device Mapper Multipath (DM Multipath)

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