From mboxrd@z Thu Jan 1 00:00:00 1970 From: Miles Fidelman Subject: Re: RAID6 and crashes (reporting back re. --bitmap) Date: Thu, 10 Jun 2010 17:22:19 -0400 Message-ID: <4C11578B.8010202@meetinghouse.net> References: <4C1128C2.4020105@meetinghouse.net> <20100611005743.43664e5b@natsu> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20100611005743.43664e5b@natsu> Sender: linux-raid-owner@vger.kernel.org Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids Roman Mamedov wrote: > On Thu, 10 Jun 2010 14:02:42 -0400 > Miles Fidelman wrote: > > >> 2. Are there any settings that can reduce the likelihood of a RAID >> volume being dirty after a crash? (The crash/reboot isn't that much of >> a problem - the several hours of degraded performance ARE a problem.) >> > Do you currently have a write intent bitmap in the array? I think it can > reduce the need for recovery by an order of magnitude in some cases. Check man > mdadm for --bitmap if you don't use it yet. > Just went through the process of turning it on for all my arrays. Incredibly painless and quick. Now I get to wait and see if it helps the next time I have a crash/reboot event. Thanks very much! Miles -- In theory, there is no difference between theory and practice. In practice, there is. .... Yogi Berra