From: Mike Christie <michaelc@cs.wisc.edu>
To: device-mapper development <dm-devel@redhat.com>
Cc: Devin <delldudedevin@gmail.com>
Subject: Re: Multipath / iSCSI issues
Date: Sun, 24 Feb 2013 17:50:00 -0600 [thread overview]
Message-ID: <512AA728.7040507@cs.wisc.edu> (raw)
In-Reply-To: <CAEctU6r9dnVnaMFgzO+8g0ktJ2VFTCaN47NiR5F4QH16_iX53g@mail.gmail.com>
On 02/24/2013 01:15 PM, Devin wrote:
>
> I am running Oracle Enterprise Linux 5.8 (which is really just Redhat).
> I am using Multipath and I have LUNS presented to me via iSCSI from a
> Hitachi SAN. I have the NICS bonded using the Linux bonding driver and
> using Active-Backup mode. I notice that when I loose a switch or
> connection to one of the switches that multipath freezes for at least 60
> seconds before it starts to respond again. Also it appears that IO being
> generated freezes until multipath responds again, this pause up to 60
> seconds is causing my Oracle instances to crash.
>
> I have not been able to easily find what settings i could possibly
> change to make it fail to a new path faster. It almost seems like it's
> taking multipath a bit to fail all IO to a new path that is working.
>
> Is there any information that might be useful for me that I can check on
> either the multipath side or the iSCSI side to see what is causing the
> issue???
>
What iscsi driver are you using? If you are using software iscsi that
comes with OEL 5.8 what are our node.session.timeo.replacement_timeout,
.timeo.noop_out_timeout and .timeo.noop_out_interval. And what is your
scsi command timeout. You can see that by doing:
cat /sys/block/sdX/device/timeout
next prev parent reply other threads:[~2013-02-24 23:50 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-02-24 19:15 Multipath / iSCSI issues Devin
2013-02-24 23:50 ` Mike Christie [this message]
2013-02-25 2:07 ` Devin
2013-02-25 16:42 ` Mike Christie
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=512AA728.7040507@cs.wisc.edu \
--to=michaelc@cs.wisc.edu \
--cc=delldudedevin@gmail.com \
--cc=dm-devel@redhat.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.