On 11/10/05, Jon Nelson <jnelson-suse@jamponi.net> wrote:
On Thu, 10 Nov 2005, Yu Safin wrote:
On 11/10/05, Kyek, Andreas, VF-DE <A.Kyek@vodafone.com> wrote:
Yu Safin wrote:
I have a problem doing a restore of an LVM. I have an LVM with one Logical Volume and three disks (physical) mounted on /original. I did a backup of the three disks (dd) and now I need to restore but instead of restoring to the original LVM mount point (/original), I want to restore to a new mount point (/backup).
??? a dd Backup/Restore works on _physical_ devices (HDs, partitions, etc). It does not work on logical stuff like "mountpoints". OK, I understand this.
Just Restore your three disks with dd which is what I did but to different 3 disk. However, I don't want to restore to the /original mount point, I am trying to keep my existing /original and restore to a new /restore location (on the new 3 disks). Then try to rescan your volume group. If your LV can be found, mount it whereever you want. For some reason when I go through the pvcreate, vgcreate, lvcreate, lvdisplay everything is fine. Then I do a "mkdir /restore" and when I follow it with the mount, it complains that I have to do a "mke2fs -j /---new---LVM". But if I do that, then the mount works but the data from my original LVM is not there. I have done a few restores trying to figure out how to get around this problem. My restores take about 3 hours.
Why don't you try this:
This requires that you have the dd'd file available locally. mount -o loop,ro -t filesystem_type ./file_from_dd /temporary_mount_point
If that works, then: using lvcreate and mkfs.whatever, make a filesystem large enough to hold all of the files. Mount it under /new_mount_point.
cd /temporary_mount_point rsync -av . /new_mount_point
umount /temporary_mount_point
An alternative (and this is *dangerous*):
use lvcreate to make a new logical volume *at least* as large as the file_from_dd. Then
dd if=file_from_dd of=/path/to/logical_volume bs=4K sync
By /path/to/logical_volume:
If your volume group is named "jbod" and you created a logical volume named "fish", the path would be /dev/jbod/fish
Lastly: never use dd to back anything up again. Back up files, not block devices. Very good advise but it was the only backup I had. The file backup got damaged somehow and thanks god I had the disk backups. Unfortunately I needed to re-use my /LVM for an application so I created a new one. Now I am trying to go to my backup to restore what I had before my incident. The restore to the new disks works fine. When I do a "pvdisplay -new-volumes" it shows my LVM on the volumes. When I do a pvscan it does not find it. I followed your first advise but the mount -o loop shows nothing inside the file. When I followed the second advise I can't find /dev/jbod/fish.
-- Carpe diem - Seize the day. Carp in denim - There's a fish in my pants!
Jon Nelson <jnelson-suse@jamponi.net>
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