From mboxrd@z Thu Jan 1 00:00:00 1970 From: Anthonys Lists Subject: Re: RFC - Raid error detection and auto-recovery (was Fault tolerance with badblocks) Date: Tue, 16 May 2017 17:11:58 +0100 Message-ID: <591B24CE.50805@youngman.org.uk> References: <591314F4.2010702@youngman.org.uk> <87lgpyn5sf.fsf@notabene.neil.brown.name> <87vap2tlvq.fsf@esperi.org.uk> <5919B0AC.30705@youngman.org.uk> <7ba308d7-6954-8cd9-e623-93b940c5e370@turmel.org> <591AD58E.6090408@youngman.org.uk> <591B125A.1000307@youngman.org.uk> <1bccccd1-1ff8-1cb3-492e-42468a3c8a8f@turmel.org> <87efvosstq.fsf@esperi.org.uk> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <87efvosstq.fsf@esperi.org.uk> Sender: linux-raid-owner@vger.kernel.org To: Nix , Phil Turmel Cc: NeilBrown , linux-raid List-Id: linux-raid.ids On 16/05/2017 16:51, Nix wrote: > On 16 May 2017, Phil Turmel spake thusly: > >> >On 05/16/2017 10:53 AM, Wols Lists wrote: >>> >>First thing we do is read the entire stripe. >> > >> >A substantial performance degradation, right out of the gate... > I'm fairly sure Wol's intention is to do this as part of a check/repair > operation. You don't want to run like this in normal usage! (Though I > agree that it seems unclear whether you want to do this at all.) It's not meant to be on by default. Imho, if the sysadmin switches it on, it's their lookout :-) Integrity over speed - some sysadmins might make that choice. Cheers, Wol