On 2008-06-10, Troels Arvin <[EMAIL PROTECTED]> wrote:
>
> Does your RHEL 5 server respect when you change the "Preferred path" of a
> logical drive in the SAN? If so: Can I see your multipath.conf?
% grep -v ^# /etc/multipath.conf
blacklist {
#devnode "*"
}
defaults {
user_friendly_names yes
}
devices {
device {
vendor "IBM"
product "1815"
prio_callout "/sbin/mpath_prio_rdac /dev/%n"
path_grouping_policy group_by_prio
failback immediate
path_checker rdac
hardware_handler "1 rdac"
user_friendly_names yes
}
}
"failback immediate" sounds wrong to me, but that's what I have, and
I think I've tested failovers.. Hmm, guess I should double-check that one.
>
>> DS4800+dm-multipath is supported from Red Hat.
>
> I beg to differ. I've just closed a support case with Red Hat because
> they were not able to help.
Well, when I asked them they specifically stated that DS4800 +
RHEL5/dm-multipath was a redhat supported option. The respons from
redhat was:
"dm-multipath works with DS4800 and is supported by Red Hat but not IBM.
If you would like (or need) a fully supported IBM installation then you
will need to use mpp/lsi (but it is not supported by Red Hat)
In this case it is best to inquire with IBM to see what they say and with
the above information and the response from IBM, you will need to decide
the best course of action for your set up."
BTW: this is a good resource for this config:
http://sources.redhat.com/lvm2/wiki/MultipathUsageGuide
-jf
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