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 1MGZBP-0006Mk-Qy for garchives@archives.gentoo.org; Tue, 16 Jun 2009 13:58:39 +0000 Received: from pigeon.gentoo.org (localhost [127.0.0.1]) by pigeon.gentoo.org (Postfix) with SMTP id DC624E048F; Tue, 16 Jun 2009 13:58:38 +0000 (UTC) Received: from relay01.mx.bawue.net (relay01.mx.bawue.net [193.7.176.67]) by pigeon.gentoo.org (Postfix) with ESMTP id B3C61E048F for ; Tue, 16 Jun 2009 13:58:38 +0000 (UTC) Received: from [129.69.212.52] (hspc32.informatik.uni-stuttgart.de [129.69.212.52]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) (Authenticated sender: stoile) by relay01.mx.bawue.net (Postfix) with ESMTP id 1A69448065 for ; Tue, 16 Jun 2009 15:58:38 +0200 (CEST) Subject: Re: [gentoo-user] [OT] RAID 1 over network From: Philipp Riegger To: gentoo-user@lists.gentoo.org In-Reply-To: <20090616164510.57f049c7@ilievnet.com> References: <20090616124046.7e484352@symbox> <20090616185856.61bd4ee3@coercion> <20090616164510.57f049c7@ilievnet.com> Content-Type: text/plain Date: Tue, 16 Jun 2009 15:58:37 +0200 Message-Id: <1245160717.11720.4.camel@hspc32.informatik.uni-stuttgart.de> 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 2.12.1 Content-Transfer-Encoding: 7bit X-Archives-Salt: 857470af-df1e-4c7a-b094-dcae1805a98c X-Archives-Hash: 3f1d8cd80298253ed952e4c7b503a0c9 On Tue, 2009-06-16 at 16:45 +0300, Daniel Iliev wrote: > DRBD is HA solution which is achieved by switching the role of the > nodes in case the "active node" goes offline. I think DRBD is not meant > for the schema OP has described, because only the "active node" is > accessible via FS. DRBD works between the FS and block device layers. > It catches the FS writes from the active node and sends them over the > network. DRBD on the backup node receives those and replicates them > directly to the disk driver. Thus you can't have mounted FS on the > backup node. If the active node goes offline, the backup node takes > over which means DRBD switches roles and the FS has to be mounted > afterwards. But that might be a good solution with 2.6.30, NFS and FSCACHE. Another solution would be to use ndb (network block devices), dm-raid and a cluster filesystem. Philipp