From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from pigeon.gentoo.org ([208.92.234.80] helo=lists.gentoo.org) by finch.gentoo.org with esmtp (Exim 4.60) (envelope-from ) id 1Pzedm-0001wP-32 for garchives@archives.gentoo.org; Wed, 16 Mar 2011 00:31:06 +0000 Received: from pigeon.gentoo.org (localhost [127.0.0.1]) by pigeon.gentoo.org (Postfix) with SMTP id 7A2C1E06BE; Wed, 16 Mar 2011 00:29:35 +0000 (UTC) Received: from outbound.icp-qv1-irony-out4.iinet.net.au (outbound.icp-qv1-irony-out4.iinet.net.au [203.59.1.104]) by pigeon.gentoo.org (Postfix) with ESMTP id C6023E06BE for ; Wed, 16 Mar 2011 00:29:34 +0000 (UTC) X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AkEGACqhf006B8n2/2dsb2JhbACEPpRRjH93sA2RQ4Eng0V2BIUuin4a X-IronPort-AV: E=Sophos;i="4.63,191,1299427200"; d="scan'208";a="642355696" Received: from unknown (HELO moriah.localdomain) ([58.7.201.246]) by outbound.icp-qv1-irony-out4.iinet.net.au with ESMTP; 16 Mar 2011 08:29:32 +0800 Received: from localhost (localhost [127.0.0.1]) by moriah.localdomain (Postfix) with ESMTP id 9C0A41F44EBC for ; Wed, 16 Mar 2011 08:29:32 +0800 (WST) X-Virus-Scanned: amavisd-new at localdomain Received: from moriah.localdomain ([127.0.0.1]) by localhost (moriah.localdomain [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Kt8DE9v6z8fR for ; Wed, 16 Mar 2011 08:29:27 +0800 (WST) Received: from [192.168.48.1] (troll [192.168.48.1]) by moriah.localdomain (Postfix) with ESMTP id 731F41E3327E for ; Wed, 16 Mar 2011 08:29:27 +0800 (WST) Subject: Re: [gentoo-user] Re: terrible performance with btrfs on LVM2 using a WD 2TB green drive From: Bill Kenworthy To: gentoo-user@lists.gentoo.org In-Reply-To: References: <1300167466.30677.32.camel@troll> Content-Type: text/plain; charset="UTF-8" Date: Wed, 16 Mar 2011 08:29:25 +0800 Message-ID: <1300235366.14376.10.camel@troll> Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-Id: Gentoo Linux mail X-BeenThere: gentoo-user@lists.gentoo.org Reply-to: gentoo-user@lists.gentoo.org Mime-Version: 1.0 X-Mailer: Evolution 2.30.3 Content-Transfer-Encoding: 7bit X-Archives-Salt: X-Archives-Hash: a1dbaea7122e10aa7571898b6752467b On Tue, 2011-03-15 at 15:26 +0000, James wrote: > Bill Kenworthy iinet.net.au> writes: > > > > I have recently added a WD 2TB green drive to two systems and am finding > > terrible performance with btrfs on an LVM using these drives. > > Hmmmm, I've been contemplating btrfs on some new installs > with the eventual goal of a CEPH network file system, on top > of ext4 and/or btrfs. Is this issue just with the drivers, or > related to btrfs too? > same plan as mine :) > How is btrfs , from the "driver's seat"? > Some early corruption that was due to a failing (old/ancient) HD - easily fixed using online fsck until I realised it was caused by the hardware and removed the drive (actually it finally died!). I have had one instance of a more serious corruption caused by some bug in btrfs that needed the latest btrfsck from git to fix offline - later kernels do not suffer from this apparently. Otherwise I have been hammering it as a dirvish backup server and except for speed its fine - and I wont be able to confirm that the speed issue is btrfs's fault until I get the partitioning correct - and dirvish is somewhat unique in what it does so it could be a special case. > Does this aberration you detail, extend to the Green Seagate 2T drives? > No idea :) > > I just saw on the mythtv list about the sector size problem these drives > > Can you give a precise link to this list or can I follow it (read only) > via net news? (if so what is the news group name)? google for adf and 4k sectors > > I'd like to read up on this issue, as I have several gentoo installs > (very soon) that will have RAID1 using (2) ST 2T green drives. > > Alternative RAID configs and performance/reliability results is > also of keen interest to many; so thanks for posting about these > issues. > > > James > > Read up about raid and the model of green drive you are contemplating - not all are compatible from what I have read. Billk