From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Fri, 25 Aug 2000 00:46:13 +0200 From: =?iso-8859-1?Q?Ragnar_Kj=F8rstad?= Subject: Re: [linux-lvm] LVM and sw RAID1 Message-ID: <20000825004612.A16428@vestdata.no> References: <20000824124613.B19952@colombina.comedia.it> <200008241747.e7OHlNd04033@webber.adilger.net> <20000824200438.A32379@colombina.comedia.it> Mime-Version: 1.0 In-Reply-To: <20000824200438.A32379@colombina.comedia.it>; from Luca Berra on Thu, Aug 24, 2000 at 08:04:38PM +0200 Sender: owner-linux-lvm Errors-To: owner-linux-lvm List-Id: Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Luca Berra , Andreas Dilger , linux-lvm@msede.com On Thu, Aug 24, 2000 at 08:04:38PM +0200, Luca Berra wrote: > > > fixed that and pvmoved everything onto my lvm+raid5 (fixing another bug > > > in the process). Well, i discovered that reiserfs + LVM + raid DOES NOT > > > WORK, it actually filled 95% of my files with zeroes :) > > > > No journalling filesystem will work properly with RAID 5 - not reiserfs > > and not ext3. You need to stick with a non-journalling filesystem, or > > use RAID1. It may be that this is supposed to be fixed in 2.4, but I'm > > not 100% sure... > > > I probably dinna specify but it i am running 2.4.0-test7pre5 > so i can confirm reiserfs not working on raid+lvm with 2.4 If you have more information, please send a bugrapport to reiserfs@devlinux.com. > AFAIR the problem with journaling and raid was due to raid's usage > of the buffer cache during recnstruction, there was no reconstrucion > happening on my system. i will also try reiserfs on raid without > lvm, i cannot try ext3 since there isn't any patch for 2.4 For linux 2.2 it will not work with raid5 at all, the reconstruction issue is just for mirroring....I think. >From Chris Mason on reiserfs@devlinux.com: > reiserfs and raid: > The FAQ should state that hardware RAID is not a problem > 2.2: I found a mail saying that concatening, striping and mirroring > are ok, but raid5 has issues, but I also seem to remember reading > there were issues with reconstructing mirroring? Correct, any hardware raid is safe. For software, striping is ok. Mirroring is ok, but you *cannot* use the online mirror rebuild. software raid5 is unsafe. lvm is safe. > 2.4: Is everything working here? both lvm and md? > Yes, software raid in 2.4 is working properly, and so is lvm. -- Ragnar Kjorstad Torque Systems / Big Storage