We have a DotHill iSCSI device which i've already setup with one volume.
The device has two controllers each with two network ports, so the
volume is accessible via four different IP addresses. On the initiator,
the volume thus shows up as four disks, /dev/sde thru /dev/sdh. I
already created a partition and currently i just mount one of the
partitions, but would like to setup multipath instead so if something
fails, the multipath device will continue working without having to
remount anything.
I used scsi_id to find the WWID of sde thru sdh, they all have the same
WWID. I thought a multipath.conf like this would work:
blacklist {
wwid "*"
}
blacklist_exceptions {
wwid "3600c0ff00012400bdb0e485701000000"
}
defaults {
selector "round-robin 0"
path_grouping_policy multibus
getuid_callout "/sbin/scsi_id -g -u -s /block/%n"
user_friendly_names yes
}
multipaths {
multipath {
wwid 3600c0ff00012400bdb0e485701000000
}
}
devices {
device {
vendor "DotHill"
product "R/Evo 2330-2R"
no_path_retry "queue"
}
}
but when i start multipathd i see a bunch of errors and no successes:
Jul 8 16:02:42 initiator kernel: device-mapper: table: 253:3:
multipath: error getting device
Jul 8 16:02:42 initiator kernel: device-mapper: ioctl: error adding
target to table
[previous 2 lines repeated several times]
Jul 8 16:02:42 initiator multipathd: path checkers start up
Jul 8 16:02:46 initiator kernel: device-mapper: table: 253:3:
multipath: error getting device
Jul 8 16:02:46 initiator kernel: device-mapper: ioctl: error adding
target to table
Jul 8 16:02:46 initiator multipathd: dm-3: remove map (uevent)
Jul 8 16:02:46 initiator multipathd: dm-3: devmap not registered, can't
remove
[previous 4 lines repeated several times]
and 'multipath -v2' command doesn't print anything. The
initiator/server is running RHEL5.
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