From mboxrd@z Thu Jan 1 00:00:00 1970 From: Spelic Subject: Re: filesystem corruption Date: Wed, 05 Jan 2011 16:52:04 +0100 Message-ID: <4D2493A4.9010209@shiftmail.org> References: <4D212D4A.3040003@feystorm.net> <20110103141603.632fdf3e@notabene.brown> <4D247FFB.3090209@feystorm.net> Mime-Version: 1.0 Content-Type: text/plain; format=flowed; charset=KOI8-R Content-Transfer-Encoding: 7bit Return-path: In-reply-to: <4D247FFB.3090209@feystorm.net> Sender: linux-raid-owner@vger.kernel.org To: "Patrick H." Cc: linux-raid List-Id: linux-raid.ids On 01/05/2011 03:28 PM, Patrick H. wrote: > No, my drives are battery backed as well. what drives are they, if I can ask? OCZ SSDs with supercapacitor maybe? Do you know if they will really flush the whole write cache on sudden power off? I read smoky sentences about this for the OCZ drives. In certain points it seemed like the supercapacitor was only able to provide the same guarantees of a HDD, that is, no further data loss due to erase-then-rewrite-32K and flash wear levelling stuff, but was not able to flush the write cache. Did you try with e.g. a stream of simple databases transactions then disconnecting the cable suddenly like this test http://www.mysqlperformanceblog.com/2009/03/02/ssd-xfs-lvm-fsync-write-cache-barrier-and-lost-transactions/ ? Thank you