From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from magic.merlins.org ([209.81.13.136]:52702 "EHLO mail1.merlins.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750947AbaHTEGG (ORCPT ); Wed, 20 Aug 2014 00:06:06 -0400 Date: Tue, 19 Aug 2014 20:22:05 -0700 From: Marc MERLIN To: M G Berberich Cc: linux-btrfs Subject: Re: Questions on using BtrFS for fileserver Message-ID: <20140820032205.GL3875@merlins.org> References: <20140819162151.GA15166@forwiss.uni-passau.de> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 In-Reply-To: <20140819162151.GA15166@forwiss.uni-passau.de> Sender: linux-btrfs-owner@vger.kernel.org List-ID: On Tue, Aug 19, 2014 at 06:21:52PM +0200, M G Berberich wrote: > · incremental send/receive works. Yes. > · There is no support for hotspares (spare disks that automatically > replaces faulty disk). Correct > · BtrFS with RAID1 is fairly stable. >>From what I know. > · RAID 5/6 spreads all data over all devices, leading to performance > problems on large diskarrays, and there is no option to limit the > numbers of disk per stripe so far. Not sure about the performance issue, but either way, don't use RAID5/6 with btrfs for anything else than playing around. The code is not finished. > · If a disk failes, does BtrFS rebalance automatically? (This would > give a a kind o hotspare behavior) No, not for raid5/6. > · Are there any reports/papers/web-pages about BtrFS-systems this size > in use? Praises, complains, performance-reviews, whatever… Use md-raid5 which is known and true, and put btrfs on top. And still have backups, be ready for btrfs to become unusable (speed and/or deadlocks), get trashed, or some other problem. It's not guaranteed to happen, but the odds are far from being 0 either, so either your data is throwaway, or have good backups. Marc -- "A mouse is a device used to point at the xterm you want to type in" - A.S.R. Microsoft is to operating systems .... .... what McDonalds is to gourmet cooking Home page: http://marc.merlins.org/ | PGP 1024R/763BE901