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From: Bart Van Assche <bvanassche@acm.org>
To: Roland Dreier <roland@purestorage.com>
Cc: Ric Wheeler <rwheeler@redhat.com>,
	linux-fsdevel@vger.kernel.org,
	"linux-scsi@vger.kernel.org" <linux-scsi@vger.kernel.org>
Subject: Re: [LSF/MM TOPIC] linux servers as a storage server - what's missing?
Date: Wed, 18 Jan 2012 18:51:37 +0000	[thread overview]
Message-ID: <CAO+b5-qHGLXr7HtzV9R81sk8=h_L2i9-pR+uZ7yrGiKktsGZUQ@mail.gmail.com> (raw)
In-Reply-To: <CAL1RGDXDaeNG_YVC38f4nxvBA+btbypcW=1KyEzm90UQOw3HiQ@mail.gmail.com>

On Wed, Jan 18, 2012 at 6:46 PM, Roland Dreier <roland@purestorage.com> wrote:
> > Why would you crash is you have device mapper multipath configured to handle
> > path fail over? We have tons of enterprise customers that use that...
>
> cf http://www.spinics.net/lists/linux-scsi/msg56254.html
>
> Basically hot unplug of an sdX can oops on any recent kernel, no
> matter what dm stuff you have on top.
>
> > On the broader topic of error handling and so on, I do agree that is always
> > an area of concern (how many times to retry, how long time outs need to be,
> > when to panic/reboot or propagate up an error code)
>
> Yes, especially the scsi eh stuff escalating to a host reset when
> a single drive has gone bad -- even if the HBA is happily doing IO
> to other drives, we'll kill access to the whole SAS fabric.

With which SCSI low-level diver does that occur and how does the call
stack look like ? I haven't encountered any such issues while testing
the srp-ha patch set. However, I have to admit that the issues
mentioned in the description of commit 3308511 were discovered while
testing the srp-ha patch set.

Bart.

  reply	other threads:[~2012-01-18 18:51 UTC|newest]

Thread overview: 50+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-12-21 15:59 [LSF/MM TOPIC] linux servers as a storage server - what's missing? Ric Wheeler
2011-12-22  8:14 ` Shyam_Iyer
2011-12-22  8:14   ` Shyam_Iyer
2011-12-22 15:58   ` Vivek Goyal
2011-12-22 20:54     ` Shyam_Iyer
2011-12-22 20:54       ` Shyam_Iyer
2011-12-23  3:06       ` Vivek Goyal
2011-12-23  4:35         ` Shyam_Iyer
2011-12-23  4:35           ` Shyam_Iyer
2012-01-09 12:18       ` Hannes Reinecke
2012-01-09 12:59         ` Tom Coughlan
2012-01-10  6:53           ` Ric Wheeler
2012-01-20  8:55             ` Hannes Reinecke
2012-01-19 16:17           ` [LSF/MM TOPIC] linux servers as a storage server - what'smissing? Loke, Chetan
2012-01-19 16:17             ` Loke, Chetan
2012-01-19 16:19             ` Ric Wheeler
2012-01-19 16:26               ` Loke, Chetan
2012-01-19 16:26                 ` Loke, Chetan
2012-01-19 16:29                 ` Ric Wheeler
2012-01-19 17:32                   ` Loke, Chetan
2012-01-19 17:32                     ` Loke, Chetan
2012-01-19 17:44                     ` Ric Wheeler
2012-01-19 21:30                       ` Loke, Chetan
2012-01-19 21:30                         ` Loke, Chetan
2012-01-19 21:39                         ` Ric Wheeler
2012-01-24 17:05                           ` Loke, Chetan
2012-01-24 17:05                             ` Loke, Chetan
2012-01-24 18:13                             ` Ric Wheeler
2012-01-26 22:24                             ` Dave Chinner
2012-01-26 22:29                               ` Ric Wheeler
2012-01-03 19:26 ` [LSF/MM TOPIC][ATTEND] linux servers as a storage server - what's missing? Jeff Layton
2012-01-03 19:32   ` Chuck Lever
2012-01-17 21:16     ` J. Bruce Fields
2012-01-17 21:25       ` Chuck Lever
2012-01-24 21:36   ` J. Bruce Fields
2012-01-24 23:13     ` Ric Wheeler
2012-01-25 19:05       ` Christopher R. Hertel
2012-01-25 20:25       ` Christopher R. Hertel
2012-01-25 21:56         ` Roland Dreier
2012-01-25 22:09           ` Christopher R. Hertel
2012-01-26 21:52             ` Andy Grover
2012-01-26 11:15         ` Bart Van Assche
2012-01-18 17:00 ` [LSF/MM TOPIC] " Roland Dreier
2012-01-18 17:51   ` Ric Wheeler
2012-01-18 18:46     ` Roland Dreier
2012-01-18 18:51       ` Bart Van Assche [this message]
2012-01-18 19:00         ` Roland Dreier
2012-01-19  8:16         ` Rolf Eike Beer
2012-01-19 17:50       ` Loke, Chetan
2012-01-19 17:50         ` Loke, Chetan

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