* Chandra Seetharaman
What version of multipath tools are you using ?
0.4.7.
Can you attach your multipath.conf file. You should be using the rdac
path checker instead of the tur path checker.
Hmm, this was added in 0.4.8... What's the difference between the
rdac path checker and the tur checker? Anyway, it appears to me that
the problem here is with the kernel hardware handler, not in the
userspace path checker, wouldn't you agree? The hardware handler is
invoked unpon pg init as expected, but fails to do its job.
Can you attach the o/p of "multipath -ll"
mysql (3600a0b80002984ae0000179c46a68843)
[size=20 GB][features=1 queue_if_no_path][hwhandler=1 rdac]
\_ round-robin 0 [prio=0][enabled]
\_ 3:0:0:1 sdd 8:48 [active][ready]
\_ 4:0:0:1 sdh 8:112 [active][ready]
\_ round-robin 0 [prio=6][active]
\_ 3:0:1:1 sdg 8:96 [active][ready]
\_ 4:0:1:1 sdj 8:144 [active][ready]
www (3600a0b80002984ae0000179b46a687fb)
[size=45 GB][features=1 queue_if_no_path][hwhandler=1 rdac]
\_ round-robin 0 [prio=0][enabled]
\_ 3:0:0:0 sdc 8:32 [active][ready]
\_ 4:0:0:0 sde 8:64 [active][ready]
\_ round-robin 0 [prio=6][active]
\_ 3:0:1:0 sdf 8:80 [active][ready]
\_ 4:0:1:0 sdi 8:128 [active][ready]
This is after the machine has booted, so things have changed around a
little. 3:0:0:1 and 4:0:0:0 has switched devices, but otherwise it
looks like it did when I generated the problem.
I presume 8:64 and 8:112 are the devices corresponding to other paths of
the device.
That's right.
You can see that the MODE_SELECT command is sent and immediately the
path is failed (which means the MODE_SELECT command has failed).
And this the same thing that repeats below.
Yes. It appears to me it's sending that MODE_SELECT (which I guess is
like dm-emc's "trespass"?) command when it's trying to activate the
pg, but it simply doesn't work, so it's retrying over and over again,
but in vain. And after a while ext3 gets remounted r/o and it's game
over.
Regards
--
Tore Anderson
# This file is managed by puppet, any local changes will be lost
defaults {
user_friendly_names yes
}
defaults {
multipath_tool "/sbin/multipath -v0"
udev_dir /dev
polling_interval 10
rr_wmin_io 100
}
blacklist {
devnode "^(ram|raw|loop|fd|md|dm-|sr|scd|st)[0-9]*"
devnode "^hd.*"
devnode "^cciss!c[0-9]d[0-9]*[p[0-9]*]"
device {
vendor IBM-ESXS
}
}
multipaths {
multipath {
wwid 3600a0b80002984ae0000179b46a687fb
alias www
}
multipath {
wwid 3600a0b80002984ae0000179c46a68843
alias mysql
}
}
devices {
device {
vendor DGC
product RAID.*
hardware_handler "1 emc"
prio_callout "/sbin/mpath_prio_emc /dev/%n"
path_checker emc_clariion
path_grouping_policy group_by_prio
failback immediate
no_path_retry queue
}
device {
vendor SUN
product CSM200_R
hardware_handler "1 rdac"
prio_callout "/usr/local/sbin/mpath_prio_rdac /dev/%n"
path_checker tur
path_grouping_policy group_by_serial
failback immediate
no_path_retry queue
}
}
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