[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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> 
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