From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Leslie Rhorer" Subject: RE: Odd RAID failure Date: Fri, 10 Apr 2009 20:34:28 -0500 Message-ID: <20090411013434.TGVC5844.cdptpa-omta02.mail.rr.com@Leslie> References: <49DF7B4D.5080109@kernel.org> Reply-To: Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from cdptpa-omtalb.mail.rr.com ([75.180.132.121]:60433 "EHLO cdptpa-omtalb.mail.rr.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750918AbZDKBej (ORCPT ); Fri, 10 Apr 2009 21:34:39 -0400 Received: from Leslie ([68.203.168.150]) by cdptpa-omta02.mail.rr.com with ESMTP id <20090411013434.TGVC5844.cdptpa-omta02.mail.rr.com@Leslie> for ; Sat, 11 Apr 2009 01:34:34 +0000 In-Reply-To: <49DF7B4D.5080109@kernel.org> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: linux-ide@vger.kernel.org > >>> If you can bear with slower operation, keeping issuing sync repeatedly > >>> (ie. something like while true; do sync; sleep 1; done) and see how > >>> the behavior changes might shed some light on what's going on too. > >> I wouldn't expect it to have any diagnostic value, really. The sync > >> command > >> locks up just like every other disk I/O when the event occurs. > > > > I tried this and it doesn't seem to have made a difference. Neither > does > > using noop as the scheduler. > > Hmm... yeah, I was mostly thinking about ext3 for this and the next > suggestion, which often has large latency when flushing its journal to > disk. I suppose the next stop is trying another filesystem? Well, I thought of that, of course. With over 6T of data, that means taking the array down (mostly) for more than 3 days. 'Not a propect I cherish, especially since it measn most of the data will then only exost on the backup system, and over a period of 3 days there are a lot of opportunities to lose the backup system , especially since it is JBOD. Indeed, the last time I re-formatted the RAID array, the backup system did fail. The motherboard shorted and took the power supply with it. Fortunately, I was able to recover the backup system and only lost a few files.