From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mike Power Subject: Re: mdadm and disk failures Date: Thu, 16 Jun 2011 08:34:52 -0700 Message-ID: <4DFA229C.1080404@dodtsair.com> References: <4DF97A7B.1070901@dodtsair.com> <20110616105908.474d22bc@natsu> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20110616105908.474d22bc@natsu> Sender: linux-raid-owner@vger.kernel.org To: Roman Mamedov Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids Ahh I understand more clearly now. Because the failing drive will report an IO error the raid system can respond reactively by getting the data else where and writing it to the failing disk. Earlier I had thought that the raid system might periodically poll the disks to see what blocks were lost and correct them. This makes me much more interested in setting up a raid system above and beyond the performance benefit.