From mboxrd@z Thu Jan 1 00:00:00 1970 From: Miles Fidelman Subject: Re: Missing Drives Date: Tue, 20 Jul 2010 22:06:31 -0400 Message-ID: <4C465627.5050002@meetinghouse.net> References: <201007210129.41566.james@howells.uk.net> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <201007210129.41566.james@howells.uk.net> Sender: linux-raid-owner@vger.kernel.org Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids James Howells wrote: > Basically, I have a 5 disk RAID-5 array in an Addonics external enclosure. > Each disk is 1TB in size. Since I am running it over USB, it's takes 3-3.5 > days to resync the disks if something goes pear-shaped. > > I can't speak to your underlying problem, but if you add an internal (or external) bitmap to your array, it speeds up rebuild time considerably. At create time, you can use the " --bitmap=internal " option. I know you can also add a bitmap to an existing array, but I don't remember the magic incantation at the moment (you can probably find it by searching the list archives - the topic has come up before). Or google "write intent bitmap." Miles Fidelman -- In theory, there is no difference between theory and practice. In practice, there is. .... Yogi Berra