avasek at yahoo.com
Fri Nov 7 01:07:11 PST 2008
Thanks!. I did know that there would be only one active path, but path switching doesnt seem to happen when one path fails. The behaviour is intermittent, so i was wondering if there are any kernel tunables that i could play with, like timeout variables etc.
From: John Nielsen <lists at jnielsen.net>
To: freebsd-questions at freebsd.org
Cc: Ganesh kamath <ganbi at yahoo.com>
Sent: Thursday, November 6, 2008 8:36:13 PM
Subject: Re: Geom multipath
On Thursday 06 November 2008 07:13:36 am Ganesh kamath wrote:
> I am trying to get multipath running in freebsd version 7. Are there
> any configuration files that i can tweak with geom multipath?. The
> paths are active/passive to the storage array and i dont seem to have
> control of what path the IO takes, so i was wondering if there are any
> tweaks thati could do to control the flow of IO to a specific path.
Read the manpage. Thoroughly. gmultipath(8). :) There is only one active
path to any device, and it is the first in the list of devices. You
specify the device list when you create the provider and it is updated if
errors occur and when gmultipath labeled devices reappear. I would
guess/hope that the order would be preserved across a reboot but I'm not
sure. That type of question might be suitable for the freebsd-geom@
> Also, the IO doesnt resume when i try to do some cable pulls and plug
> them back.
If you're not using an mpt or isp disk controller then you have to
initiate a rescan manually for the device to reappear. See camcontrol
and/or atacontrol. When the device _does_ reappear it will be inserted at
the end of the list, so I/O will continue across the alternate path which
is still first in the list.
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