From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Martin K. Petersen" Date: Thu, 22 Nov 2018 03:11:46 +0000 Subject: Re: [PATCH v5] target: add emulate_pr backstore attr to toggle PR support Message-Id: List-Id: References: <20181107131107.7426-1-ddiss@suse.de> In-Reply-To: <20181107131107.7426-1-ddiss@suse.de> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: target-devel@vger.kernel.org David, > The new emulate_pr backstore attribute allows for Persistent Reservation > and SCSI2 RESERVE/RELEASE support to be completely disabled. This can be > useful for scenarios such as: > - Ensuring ATS (Compare & Write) usage on recent VMware ESXi initiators. > - Allowing clustered (e.g. tcm-user) backends to block such requests, > avoiding the multi-node reservation state propagation. > > When explicitly disabled, PR and RESERVE/RELEASE requests receive > Invalid Command Operation Code response sense data. Applied to 4.21/scsi-queue. Thank you! -- Martin K. Petersen Oracle Linux Engineering