From mboxrd@z Thu Jan 1 00:00:00 1970 From: Daniel Pocock Subject: Re: thanks md raid Date: Thu, 10 May 2012 21:51:58 +0000 Message-ID: <4FAC387E.1010006@pocock.com.au> References: <4FAC0ED2.2000201@pocock.com.au> <4FAC37D9.6040403@hardwarefreak.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <4FAC37D9.6040403@hardwarefreak.com> Sender: linux-raid-owner@vger.kernel.org To: stan@hardwarefreak.com Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids On 10/05/12 21:49, Stan Hoeppner wrote: > On 5/10/2012 1:54 PM, Daniel Pocock wrote: >> >> I'm glad my RAID1 worked as expected... just hoping I don't encounter >> any read timeouts on the non-TLER drive before my rebuild finishes: > > You have an inverse understanding of ERC. Drives without ERC will retry > forever, or until an upper layer puts a stop to its efforts. Drives > with a 7 second ERC will return a hard error after 7 seconds. > > So the only way you'll get a timeout with your rebuild is if the healthy > drive spends 30 seconds retying a sector read. > I was thinking about the more obscure case - that some other URE followed by an attempt at write access on the good drive fails and it becomes degraded