From mboxrd@z Thu Jan 1 00:00:00 1970 From: Hannes Reinecke Subject: Re: [PATCH] scsi_dh_alua: Add module parameter to allow failover to non preferred path without STPG Date: Sun, 31 Mar 2013 18:24:22 +0200 Message-ID: <51586336.9080802@suse.de> References: <8255ED565A0EAA4A960625E27D49DBF21FF906FB@SACEXCMBX04-PRD.hq.netapp.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <8255ED565A0EAA4A960625E27D49DBF21FF906FB@SACEXCMBX04-PRD.hq.netapp.com> Sender: linux-scsi-owner@vger.kernel.org To: "Stewart, Sean" Cc: "linux-scsi@vger.kernel.org" , "dm-devel@redhat.com" , "James.Bottomley@suse.de" , "snitzer@redhat.com" List-Id: dm-devel.ids On 03/28/2013 11:07 PM, Stewart, Sean wrote: > Currently ALUA device handler sends STPG command during failover and failback. > Failover can be optimized by implicit failover (by not to sending STPG command), > when 1 is passed as hwhandler parameter in multipath.conf. ex "2 alua 1". We may > need to pass the parameter through module param for alua device handler to optimize > failover if incase retain_attached_hwhandler set in multipath.conf and hwhandler > is set with non-tpgs device handler ex: '1 rdac'. > > Signed-off-by: Vijay Chauhan > Signed-off-by: Sean Stewart > Acked-by: Hannes Reinecke Cheers, Hannes