From mboxrd@z Thu Jan 1 00:00:00 1970 From: Wols Lists Subject: Re: Fwd: Installing Linux directly onto RAID6 Array........... Date: Sun, 24 May 2015 15:53:02 +0100 Message-ID: <5561E5CE.7000304@youngman.org.uk> References: <555294A0.6040703@websitemanagers.com.au> <5561B237.4040709@youngman.org.uk> <5561BCA4.4060904@fnarfbargle.com> <5561C6E9.3060706@youngman.org.uk> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 8bit Return-path: In-Reply-To: Sender: linux-raid-owner@vger.kernel.org To: Mikael Abrahamsson Cc: Brad Campbell , Another Sillyname , linux-raid@vger.kernel.org List-Id: linux-raid.ids On 24/05/15 15:06, Mikael Abrahamsson wrote: > On Sun, 24 May 2015, Wols Lists wrote: > >> And if you get read errors, well, aiui, raid won't help here either - >> especially with mirrored raid, you just get a read failure. Raid does >> NOT give you error recovery unless the drive physically fails, and if >> it's a bad block it gets fixed at the disk or disk driver level - well >> below the raid driver. > > You're wrong. In case of a read error from the physical drive on RAID1, > RAID5 or RAID6 then the information will be re-created from another > drive, and written to the drive that threw a read error. This is the > whole point of RAID with parity information. > Except raid 1 isn't parity ... :-) Personally, I still don't think "raid"ing swap is worth it, though. Horses for courses, ram is cheap, and in my circumstances I don't think I'd gain anything. Cheers, Wol