From mboxrd@z Thu Jan 1 00:00:00 1970 From: Nathan Bryant Subject: Re: [PATCH] SCSI midlayer power management Date: Wed, 11 Aug 2004 12:43:09 -0400 Sender: linux-scsi-owner@vger.kernel.org Message-ID: <411A4C9D.4040902@optonline.net> References: <4119611D.60401@optonline.net> <20040811080935.GA26098@elf.ucw.cz> <411A1B72.1010302@optonline.net> <1092231462.2087.3.camel@mulgrave> <1092237664.19009.23.camel@localhost.localdomain> <1092241693.1590.1.camel@mulgrave> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from pegasus.allegientsystems.com ([208.251.178.236]:30726 "EHLO pegasus.lawaudit.com") by vger.kernel.org with ESMTP id S268105AbUHKQnK (ORCPT ); Wed, 11 Aug 2004 12:43:10 -0400 In-Reply-To: <1092241693.1590.1.camel@mulgrave> List-Id: linux-scsi@vger.kernel.org To: James Bottomley Cc: Alan Cox , Pavel Machek , Linux SCSI Reflector , Linux Kernel Mailing List , Jeff Garzik James Bottomley wrote: > On Wed, 2004-08-11 at 10:21, Alan Cox wrote: > >>In addition we are not doing SCSI target so multi-initiator is ok. >>One question James - what are the rules for power management with >>SCSI when we provide termpwr to a shared bus ? Well there are (at least) two reasons to do shared bus: IP over SCSI and cluster filesystems. At least for cluster filesystems I think the answer is "don't suspend your machine" for the foreseeable future - what happens if your machine goes to sleep while holding cluster FS locks, etc. I doubt any CFS vendors are going to bother to support this any time soon, since it's a HA/server feature and power management is really a desktop/laptop feature.