From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jeff Johnson Subject: Is it possible to issue device reset to PMC PM8388 expander using sg3_utils or smp_utils? Date: Thu, 09 Dec 2010 10:41:00 -0800 Message-ID: <4D0122BC.8060501@aeoncomputing.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from mail-fx0-f43.google.com ([209.85.161.43]:61992 "EHLO mail-fx0-f43.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751622Ab0LISlQ (ORCPT ); Thu, 9 Dec 2010 13:41:16 -0500 Received: by fxm18 with SMTP id 18so2747795fxm.2 for ; Thu, 09 Dec 2010 10:41:15 -0800 (PST) Sender: linux-scsi-owner@vger.kernel.org List-Id: linux-scsi@vger.kernel.org To: linux-scsi@vger.kernel.org Greetings, Is it possible to issue a low level device reset to a PMC-Sierra PM8388 24x3G SAS expander using either sg3_utils or smp_utils? I am able to enumerate and read the status of the phys on the PM8388, read end device information, etc. I tried sg_reset and it does a bus reset but not an expander reset. Technical documentation on the PM8388 is not readily available so I do not know if it has a mode select bit or other special method to get the expander to reset itself. I am looking for an inband method to reset the expander to clear a condition where some phys in a wide connection fail to link. A power cycle clears the condition and I am looking to mimic a power cycle by bouncing the expander at the lowest level possible via the SAS host connection. Thank you. --Jeff