From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from plane.gmane.org ([80.91.229.3]:41757 "EHLO plane.gmane.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753866AbaADUJZ (ORCPT ); Sat, 4 Jan 2014 15:09:25 -0500 Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1VzXX6-0007EI-4x for linux-btrfs@vger.kernel.org; Sat, 04 Jan 2014 21:09:20 +0100 Received: from ip68-231-22-224.ph.ph.cox.net ([68.231.22.224]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Sat, 04 Jan 2014 21:09:20 +0100 Received: from 1i5t5.duncan by ip68-231-22-224.ph.ph.cox.net with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Sat, 04 Jan 2014 21:09:20 +0100 To: linux-btrfs@vger.kernel.org From: Duncan <1i5t5.duncan@cox.net> Subject: Re: btrfs raid1 and btrfs raid10 arrays NOT REDUNDANT Date: Sat, 4 Jan 2014 20:08:54 +0000 (UTC) Message-ID: References: <52C73987.7000106@jrs-s.net> <52C73D1A.8060805@gmail.com> <52C7402A.7050605@jrs-s.net> <52C741F5.7030106@gmail.com> <52C74415.3020407@jrs-s.net> <7B4E55D1-BA9B-4560-8442-429EDD01C92A@colorremedies.com> <1388847120.23513.21.camel@ret.masoncoding.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-btrfs-owner@vger.kernel.org List-ID: Chris Mason posted on Sat, 04 Jan 2014 14:51:23 +0000 as excerpted: > It'll pick the latest generation number and use that one as the one true > source. For the others you'll get crc errors which make it fall back to > the latest one. If the two have exactly the same generation number, > we'll have a hard time picking the best one. > > Ilya has a series of changes from this year's GSOC that we need to clean > up and integrate. It detects offline devices and brings them up to date > automatically. > > He targeted the pull-one-drive use case explicitly. Thanks for the explanation and bits to look forward to. I'll be looking forward to seeing that GSOC stuff then, as having dropouts and re-adds auto-handled would be a sweet feature to add to the raid featureset, improving things from a sysadmin's prepared-to-deal-with- recovery perspective quite a bit. =:^) -- Duncan - List replies preferred. No HTML msgs. "Every nonfree program has a lord, a master -- and if you use the program, he is your master." Richard Stallman