[dm-devel] multipath-tools-0.4.4 on 3par unknown path failure issue

[Andy]

On Thu, Aug 11, 2005 at 04:19:24PM -0400, Alan Kasindorf wrote:
> 
> >I've had problems like this happen to me on 3par too.  What kernel version
> 
> However, I'd like to know what the exact issue is. I'm not exactly great 
> on eliciting issues with the linux kernel right now. How were you 
> monitoring what events the SAN was sending up through the card? I could 
> use this to at least verify what is happening if/when we lose another 
> mount. None of our servers were being rebooted when this happened though.
> 
My issue was that I was getting I/O errors when other systems were rebooted
(and occasionally other times, reboots consistently would cause a problem),
and those I/O errors would cause the mount to drop.  Somehow I got the idea
that turning off failfast might help and it did.  I have not monitored what
events the SAN was sending the card, all I did was turn on debugging in the
qla2xxx drivers and ask Andrew Vasquez (qlogic developer) about them.

Andy