Why multipath marked a SAN LUN subpath as active/faulty where as it's visible to system?
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] <---
sdais 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 -lof the/dev/sdadevice shows partition tables.
Environment
- Red Hat Enterprise Linux(RHEL) 5
- Device Mapper Multipath (DM Multipath)
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