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- To: email@example.com
- Subject: dd/lvm question
- From: "Koree A. Smith" <firstname.lastname@example.org>
- Date: Wed, 2 Apr 2008 16:07:29 -0500
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- Organization: Southern Illinois Linux Users Group
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I asked a related question here a while back, but I never truly solved this issue, and came at it from a different angle. Here's what I want to do:
1. I have a linux server with two drives, one is sda, the other sdb. The drives are *identical*
2. I want to dd sda to sdb
3. I want to be able to boot either sda or sdb
4. I want to be able to script a regular (daily, weekly, monthly) dd to keep the second image fresh
I have played around with this, and here are the challenges
1. the dd works fine. However, it creates duplicate UUIDs (duh), so when the system boots, it gives a message like " Found duplicate PV PnvnzL7YFft76Ky0EaPbOh519SQD5Uxc: using /dev/sdb2 not
2. I found some workarounds using the lvm.conf file's filters, but those aren't really going to work for what I want to do, as I'm not allowed to re-roll the initrd to do this.
3. pvchange -u should work fine, but I am having a challenge there. To make it work, one has to umount anything on it (easy), and disable the VGs on it (easy too). I then try to do the "pvchange -u /dev/sdb2" command, and it says that isn't a valid PV. The only thing that has to happen is for the UUIDs to change (hard) and the ext3 labels to change (easy).
Anyone got a clue how to get past this?
Koree A. Smith, RHCE