From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Greaves Subject: Re: How to avoid complete rebuild of RAID 6 array (6/8 active devices) Date: Mon, 14 Jul 2008 17:14:44 +0100 Message-ID: <487B7B74.3010903@dgreaves.com> References: <41931C59-9A91-47A6-A81C-EC14001DA95B@gmail.com> <20080625161357.GH23944@skl-net.de> <18532.50062.63173.620773@notabene.brown> <48680586.609@tmr.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Sender: linux-raid-owner@vger.kernel.org To: Matthias Urlichs Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids Matthias Urlichs wrote: > On Sun, 29 Jun 2008 17:58:30 -0400, Bill Davidsen wrote: > >> Of course build an array out of drives so unstable that you can't safelt >> *run* a check is another topic. > > It's a topic that needs to be addressed sooner or later, however. > > Let's face it, drives do develop bad spots. > > Tossing a perfectly good drive because 0.0000064% of the data cannot be > read is wasteful (assuming a 64-kByte area of an 1-terabyte disk). I've found that once a disk starts to go bad there is a very strong tendency for it to continue to deteriorate. So I don't replace disks because they have a bad sector; I replace them because I suspect they will fail more as time goes by. Sure, some don't - I don't want to take that chance. David