From mboxrd@z Thu Jan 1 00:00:00 1970 From: Miles Fidelman Subject: Re: Network-based RAID6 Date: Wed, 30 Mar 2011 10:43:17 -0400 Message-ID: <4D934185.9020201@meetinghouse.net> References: <20110330131157.49fd2521@natsu> <20110330144944.3c87185c@natsu> <4D933188.30003@hardwarefreak.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Sender: linux-raid-owner@vger.kernel.org Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids I wonder how OCFS (or some other distributed file system) would run over btfrs (raid10, no raid6), over AOE or iSCSI block devices. Roberto Spadim wrote: > OCFS with DRBD could work very nice in linux > i didn't tested mdadm with ndb in a production enviroment > DRBD have brainsplit solutions, since you will run a complex > filesystem, i consider using working solutions, DRBD and OCFS is nice > yes, mdadm can run under DRBD > DRBD = raid1 over network > OCFS = oracle filesystem (cluster filesystem) > it works > > 2011/3/30 Stan Hoeppner: > >> Roman Mamedov put forth on 3/30/2011 3:49 AM: >> >>> On Wed, 30 Mar 2011 11:20:41 +0400 >>> CoolCold wrote: >>> >>> >>>> Looking on your host I think you speak russian, so may be this will be >>>> somehow helpful for you >>>> http://community.livejournal.com/ru_root/2216389.html >>>> >>> Thanks -- I have looked through the websites of some distributed filesystems >>> (Ceph, GlusterFS, MooseFS etc) and checked this thread too, but from what I >>> could find, all filesystems I read about so far are at most capable of RAID0 or >>> RAID1-like modes, where fault-tolerance is either not provided, or achieved >>> only by "all data is replicated across N nodes", which of course divides the >>> total usable space by N. I haven't found any FS which would do block-level >>> replication relying not on dumb copies, but on RAID5/6-like parity algorithms >>> for fault-tolerance. Maybe I missed something? >>> >> You likely won't find any distributed filesystem that performs block >> level replication over the network, at least not a FOSS one. These are >> filesystems, mind you, not distributed block device drivers. If they >> perform any replication to afford a level of fault tolerance, it will be >> at the file level, not the block level. >> >> If you want true block level replication over a network, look into DRBD. >> However, it is also limited to mirroring. >> >> -- >> Stan >> -- >> To unsubscribe from this list: send the line "unsubscribe linux-raid" in >> the body of a message to majordomo@vger.kernel.org >> More majordomo info at http://vger.kernel.org/majordomo-info.html >> >> > > > -- In theory, there is no difference between theory and practice. In practice, there is. .... Yogi Berra