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[dm-devel] multipath rdac - recover from both paths lost



Hi,

I am trying to get back from a strage situation.

I have had both paths in a RDAC setup fail and then come back.

I want to know if there is a way to recover from this without a reboot.

(OS = CentOS 5.1)

multipath -ll
mpath2 (3600a0b800035ebc8000001a94652ae50) dm-4 IBM,1726-4xx  FAStT
[size=1.4T][features=0][hwhandler=1 rdac]
\_ round-robin 0 [prio=0][enabled]
 \_ 2:0:0:1 sde 8:80  [failed][ghost]
\_ round-robin 0 [prio=100][active]
 \_ 1:0:0:1 sdf 8:96  [failed][ready]

dmsetup info mpath2
Name:              mpath2
State:             ACTIVE
Tables present:    LIVE
Open count:        20
Event number:      3
Major, minor:      253, 4
Number of targets: 1
UUID: mpath-3600a0b800035ebc8000001a94652ae50

vgscan
  Reading all physical volumes.  This may take a while...
  /dev/mapper/mpath2: read failed after 0 of 4096 at 1497314033664: Input/output error
  /dev/mapper/mpath2: read failed after 0 of 4096 at 0: Input/output error

dmsetup remove --force mpath2



device-mapper: remove ioctl failed: Device or resource busy
Command failed

multipath -f mpath2 (just exits with return code 1)


dmesg

    <<vendor>> ASC=0xe0 ASCQ=0x6ASC=0xe0 ASCQ=0x6

sde: Current: sense key: Recovered Error
    <<vendor>> ASC=0xe0 ASCQ=0x6ASC=0xe0 ASCQ=0x6

sdf: Current: sense key: Recovered Error
    <<vendor>> ASC=0xe0 ASCQ=0x6ASC=0xe0 ASCQ=0x6

end_request: I/O error, dev sdf, sector 61118720
device-mapper: multipath: Failing path 8:80.
end_request: I/O error, dev sdf, sector 599510512

device-mapper: ioctl: unable to remove open device mpath2
device-mapper: ioctl: unable to remove open device mpath2

Any advice would be greatly appreciated.

Thanks,
Greg.

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