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From: "Loke, Chetan" <Chetan.Loke@netscout.com>
To: "Roland Dreier" <roland@purestorage.com>
Cc: <linux-fsdevel@vger.kernel.org>, <linux-scsi@vger.kernel.org>
Subject: RE: [LSF/MM TOPIC] linux servers as a storage server - what's missing?
Date: Thu, 19 Jan 2012 12:50:33 -0500	[thread overview]
Message-ID: <D3F292ADF945FB49B35E96C94C2061B9159135E1@nsmail.netscout.com> (raw)
In-Reply-To: <CAL1RGDXDaeNG_YVC38f4nxvBA+btbypcW=1KyEzm90UQOw3HiQ@mail.gmail.com>

> From: linux-scsi-owner@vger.kernel.org [mailto:linux-scsi-
> owner@vger.kernel.org] On Behalf Of Roland Dreier
> Sent: January 18, 2012 1:46 PM
> To: Ric Wheeler
> Cc: linux-fsdevel@vger.kernel.org; linux-scsi@vger.kernel.org
> Subject: Re: [LSF/MM TOPIC] linux servers as a storage server - what's
> missing?
> 
> > 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.


Depends on the use-case. In the particular (SAN)use-case that I'm
talking about, 
you shouldn't unplug live sdX which is still mapped on the target(array)
side.
I've attempted to fix it somewhere and it works. If you need more info
about eh and initiator fixes, email me offline.

When would this case arise? :
a) you unknowingly unmap *hot* LUNs from target(array) while managing
the array.

End result - reset storm on front-end. You just need a smarter way to
isolate/localize this
front-end storm.


Chetan Loke

      parent reply	other threads:[~2012-01-19 17:50 UTC|newest]

Thread overview: 41+ 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 15:58   ` Vivek Goyal
2011-12-22 20:54     ` Shyam_Iyer
2011-12-23  3:06       ` Vivek Goyal
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 16:19             ` Ric Wheeler
2012-01-19 16:26               ` Loke, Chetan
2012-01-19 16:29                 ` Ric Wheeler
2012-01-19 17:32                   ` Loke, Chetan
2012-01-19 17:44                     ` Ric Wheeler
2012-01-19 21:30                       ` Loke, Chetan
2012-01-19 21:39                         ` Ric Wheeler
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
2012-01-18 19:00         ` Roland Dreier
2012-01-19  8:16         ` Rolf Eike Beer
2012-01-19 17:50       ` Loke, Chetan [this message]

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