From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S268118AbUHKQ2j (ORCPT ); Wed, 11 Aug 2004 12:28:39 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S268114AbUHKQ2j (ORCPT ); Wed, 11 Aug 2004 12:28:39 -0400 Received: from stat16.steeleye.com ([209.192.50.48]:13547 "EHLO hancock.sc.steeleye.com") by vger.kernel.org with ESMTP id S268108AbUHKQ2W (ORCPT ); Wed, 11 Aug 2004 12:28:22 -0400 Subject: Re: [PATCH] SCSI midlayer power management From: James Bottomley To: Alan Cox Cc: Nathan Bryant , Pavel Machek , Linux SCSI Reflector , Linux Kernel Mailing List , Jeff Garzik In-Reply-To: <1092237664.19009.23.camel@localhost.localdomain> 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> Content-Type: text/plain Content-Transfer-Encoding: 7bit X-Mailer: Ximian Evolution 1.0.8 (1.0.8-9) Date: 11 Aug 2004 11:28:06 -0500 Message-Id: <1092241693.1590.1.camel@mulgrave> Mime-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org 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 ? I don't believe the spec addresses that. The rules we use in HA are that each bus entity supplies termpwr (i.e. all initiators and targets) and each terminator draws its power from the bus). Thus the bus is properly terminated until the last device powers down. You have to jumper this specially on most SCSI cards (especially if they're at the end of the bus and have internal termination). James