From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alex Turin Subject: Re: [PATCH 00/11] First pass at merging Bart's HA work Date: Thu, 6 Dec 2012 17:55:12 +0200 Message-ID: <50C0BFE0.909@mellanox.com> References: <1353957308.2681.5.camel@dabdike> <1353989041.28917.24.camel@obelisk.thedillows.org> <1354242098.3670.3.camel@obelisk.thedillows.org> <50BF9760.2080801@acm.org> <50C0A76C.20500@acm.org> <50C0AB42.8040402@mellanox.com> <50C0B407.4010706@acm.org> Mime-Version: 1.0 Content-Type: text/plain; charset="ISO-8859-1"; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <50C0B407.4010706-HInyCGIudOg@public.gmane.org> Sender: linux-rdma-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Bart Van Assche Cc: Or Gerlitz , David Dillow , Roland Dreier , James Bottomley , "linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , linux-scsi , fujita.tomonori-Zyj7fXuS5i5L9jVzuh4AOg@public.gmane.org, rcj-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org List-Id: linux-rdma@vger.kernel.org On 12/6/2012 5:04 PM, Bart Van Assche wrote: > On 12/06/12 15:27, Or Gerlitz wrote: >> The core problem here seems to be that scsi_remove_host simply never >> ends. > > Hello Or, > > The later patches in the srp-ha patch series avoided such behavior by > checking whether the connection between SRP initiator and target is > unique, and by removing duplicate SCSI hosts for which the transport > layer failed. Unfortunately these patches are still under review. > Unless someone can come up with a better solution I will post a patch > one of the next days that makes ib_srp again fail all commands after > host removal started. That will avoid spending a long time doing error > recovery. > > Also, you might have noticed that Hannes Reinecke reported a few days > ago that the SCSI error handler may need a lot of time for other > transport types - this behavior is not SRP specific. > > Bart. > Hello Bart, In our case we don't have duplicate hosts or targets. We are working with a single SCSI disk. To make scsi_remove_host hang we simply disabling a IB port and run "dd if=/dev/sdb of=/dev/null count=1". Alex -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html