From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andreas Dilger Message-Id: <200002100714.AAA05415@webber.adilger.net> Subject: Re: [linux-lvm] Configuring boot partition with LVM Date: Thu, 10 Feb 2000 00:14:04 -0700 (MST) MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: owner-linux-lvm Errors-To: owner-linux-lvm List-Id: Content-Type: text/plain; charset="us-ascii" To: Linux LVM mailing list Christopher Shaulis writes: > I can't remember exactly how they explained it, but IBM has a good > reason for not allowing mirrored dump devices. I think the idea is that > in order to catch the system dumping in the LVM code itself, you have to > write the dump without the aid of the LVM. I think the way that works is > that it precomputes a list of offset:extent lists for the device when it > is brought online. I think that the issue isn't when the dump is written to a mirrored LV (as the dump will only go to one or the other copy of the LV), but when it is read back there is no way to determine which copy you will read from (I/O load balancing causes reads to come from either PV), so you may get intermittent garbage inside the dump... Cheers, Andreas -- Andreas Dilger \ "If a man ate a pound of pasta and a pound of antipasto, \ would they cancel out, leaving him still hungry?" http://www-mddsp.enel.ucalgary.ca/People/adilger/ -- Dogbert