[CentOS] SAN help
Per Qvindesland
per at norhex.com
Fri Jan 8 20:08:08 UTC 2010
Hi
No if you have a dual hba then the host should in worst case scenario
become un-responsive for a second or two but then continue as nothing
had happen.
If it fails then it may be your multipath config but a lot of the time
it is sitting at your switch level or san.
Regards
Per
On Fri, 2010-01-08 at 13:50 -0600, Paras pradhan wrote:
> Thanks for the Link Ray.
>
> One thing I am confused is... "failover manual" means whenever there
> is a link failure this will case the host to be rebooted?
>
>
> Paras.
>
>
> On Fri, Jan 8, 2010 at 9:53 AM, Ray Van Dolson <rayvd at bludgeon.org>
> wrote:
> On Fri, Jan 08, 2010 at 09:45:14AM -0600, Paras pradhan wrote:
> > Since I see the following entry
> > at
> /usr/share/doc/device-mapper-multipath-0.4.7/multipath.conf.defaults
> > I am assuming I do not need to add it to multipath.conf but
> I do not know
> > exaclty. Also my storage is Hitachi openv and the default
> one has Product
> > name as "DF.*" as you can see below.
> >
> > So I am confused in here.
> >
> > device {
> > # vendor "HITACHI"
> > # product "DF.*"
> > # getuid_callout "/sbin/scsi_id -g -u -s /block/%n"
> > # prio_callout "/sbin/mpath_prio_hds_modular %d"
> > # features "0"
> > # hardware_handler "0"
> > # path_grouping_policy group_by_prio
> > # failback immediate
> > # rr_weight uniform
> > # rr_min_io 1000
> > # path_checker readsector0
> > # }
> >
>
>
> I'm not familiar with this SAN, so can't suggest to you a
> better
> device configuration snippet.
>
> Google may help you out: search for your device type and
> "multipath.conf". Alternately, if your vendor supports RHEL5
> (I'm sure
> they do), you could contact them and ask them to provide you
> with a
> known good configuration.
>
> Actually, a quick search yields this:
>
> http://www.calivia.com/book/export/html/74
>
> Which seems to have what you need (verify of course).
>
>
> Ray
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