From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <1046196255.3e5bb01f900cd@lola.Pin.LU> From: Christian Limpach Subject: RE: [linux-lvm] Recovering from a hard crash References: <8075D5C3061B9441944E1373776451180F06F7@cinshrexc03.shermfin.com> In-Reply-To: <8075D5C3061B9441944E1373776451180F06F7@cinshrexc03.shermfin.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-lvm-admin@sistina.com Errors-To: linux-lvm-admin@sistina.com Reply-To: linux-lvm@sistina.com List-Help: List-Post: List-Subscribe: , List-Unsubscribe: , List-Archive: Date: Tue Feb 25 11:58:08 2003 List-Id: Content-Type: text/plain; charset="us-ascii" To: "Rechenberg, Andrew" Cc: linux-lvm@sistina.com Quoting "Rechenberg, Andrew" : > Would I then use LVM striping across md[0-9] to get the same effect? > The reason that this box is configured in such a way is because we want > the redundancing of RAID1 and the speed of RAID0 (hence RAID10). Will > LVM striping give the same performance lift as using Linux RAID0? I would think that performance will be the same. I think you'll get better performance if you keep some disks apart for your snapshots. Interesting actually... Which is better: all striped with md which puts the snapshot striped over all the disks or striping with LVM which will put the snapshot unstriped on dedicated disks or a combination of these two... > Also, will the device mapper and LVM2 patches work against a Red Hat > kernel and are they stable enough to run in a production environment? device-mapper and LVM2 seem stable, I'm still using LVM1. The device-mapper code is definitely top-notch. I don't know about Red Hat kernels. > Also, can anyone see any harm in me modifying the source for vgscan to > skip /dev/md0 since it will never actually be used in a volume group > outside of the RAID0 stripe on top of it? Would I have to modify any > other commands to make sure that I don't run into any trouble? I think vgscan is all you need to modify, pvscan and lvmdiskscan just display data. Removing/renaming /dev/md0 is just as good, nothing needs it anyway as far as I can tell... -- Christian Limpach