Storage devices:
$ sudo lsscsi
[0:0:0:0] cd/dvd TSSTcorp CDDVDW TS-L633F IT03 /dev/sr0
[4:2:0:0] disk IBM ServeRAID M5015 2.12 /dev/sda
[5:0:0:0] disk HITACHI OPEN-V 6008 /dev/sdb
[5:0:0:1] disk HITACHI OPEN-V 6008 /dev/sdc
[5:0:0:2] disk HITACHI OPEN-V 6008 /dev/sdd
[5:0:1:0] disk HITACHI OPEN-V 6008 /dev/sde
[5:0:1:1] disk HITACHI OPEN-V 6008 /dev/sdf
[5:0:1:2] disk HITACHI OPEN-V 6008 /dev/sdg
[6:0:0:0] disk HITACHI OPEN-V 6008 /dev/sdh
[6:0:0:1] disk HITACHI OPEN-V 6008 /dev/sdi
[6:0:0:2] disk HITACHI OPEN-V 6008 /dev/sdj
[6:0:1:0] disk HITACHI OPEN-V 6008 /dev/sdk
[6:0:1:1] disk HITACHI OPEN-V 6008 /dev/sdl
[6:0:1:2] disk HITACHI OPEN-V 6008 /dev/sdm
Zoning:
- There are two HBAs. Each HBA is plugged into a separate Brocade DCX switch,
and each switch is connected to a different fabric (Fabric A and Fabric B
respectively)
- The storage array presenting the luns is also directly connected to the same
switches, in each Fabric via 4 ports (Array ports 1A,3A,6A,8A -> Fabric A;
Ports 2A,4A,5A,8A -> Fabric B).
- Each HBA is zoned so as to see two storage array ports (2 in each fabric).
Basically this means that when I disable the FC port an HBA is connected to, it
loses two paths to the lun.
HBA1 -> DCX 1 (Fabric A) -> 3A,6A
HBA2 -> DCX 2 (Fabric B) -> 4A,5A
Blacklisting:
Thanks for pointing this out - (note that I only added in the 'SMART'
vendor/product after the problem initially exhibited - in an effort to
remove the warning regarding a USB flash storage device that appeared in
the multipath -ll output. It _shouldn't_ be a factor).
Fixed now, initrd updated. Reboot/testing later today (likely in about
3 hours' time).
$ echo "show config" | sudo multipathd -k
multipathd> show config
defaults {
user_friendly_names yes
}
blacklist {
devnode ^(ram|raw|loop|fd|md|dm-|sr|scd|st)[0-9]*
devnode ^hd[a-z]
devnode ^dcssblk[0-9]*
devnode ^cciss!c[0-9]d[0-9]*
wwid 3600605b0039afe20ff000054052e7d38
device {
vendor SMART
product SMART
}
device {
vendor DGC
product LUNZ
}
device {
vendor IBM
product S/390.*
}
}
blacklist_exceptions {
}
--snip
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https://bugs.launchpad.net/bugs/1020436
Title:
Cannot read superblock after FC multipath failover
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