From mboxrd@z Thu Jan 1 00:00:00 1970 From: Milan Broz Subject: Re: md raid5 fsync deadlock Date: Thu, 01 Mar 2012 09:46:11 +0100 Message-ID: <4F4F3753.80505@redhat.com> References: <4F4EB53C.6060901@redhat.com> <20120301125325.2b17e5f8@notabene.brown> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20120301125325.2b17e5f8@notabene.brown> Sender: linux-raid-owner@vger.kernel.org To: NeilBrown Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids On 03/01/2012 02:53 AM, NeilBrown wrote: > On Thu, 01 Mar 2012 00:31:08 +0100 Milan Broz wrote: > Are you certain it is a deadlock? No forward progress at all? Seems so, it was for several hours in this state without progress. > What is in md/stripe_cache_size? Does it change? > What happens if you double the number in stripe_cache_size? What if you > double it again? stripe_cache_size was 256, I doubled it to 512, now stripe_cache_active is 390 stripe_cache size is 512 and no progress. With stripe_cache size 1024 it survived few iterations of fio run, now it is locked up again: stripe_cache_active is 921 stripe_cache size is 1024 Thanks, Milan