Hello, I am setting up a Ubuntu GNU/Linux server which will combine:
1) Software RAID1 (using mdadm) - To provide data protection against hardware failure
2) Logical Volume Manager (LVM) - Allowing flexibilty in organising my data and the ability to easily add more capacity in the future.
So far I have successfully:
1) Set up RAID1 using mdadm and created /dev/md0
2) Set up LVM making /dev/md0 a Physical Volume attached to a Volume Group called: vg_data. I have a Logical Volume called: lv_shared mounted on /home/shared :
NAME FSTYPE LABEL UUID MOUNTPOINT sda └─sda1 ext4 0xxxxxxx-2xxx-4xxx-8xxx-1xxxxxxxxxxx / sdb └─sdb1 linux_raid_member ubuntu:0 02342342-2333-4444-8888-111111111111 └─md0 LVM2_member 57e241ad-aee3-4486-8eaa-222222222222 └─vg_data-lv_shared ext4 048b529c-2e39-4f49-83c9-333333333333 /home/shared sdc └─sdc1 linux_raid_member ubuntu:0 02342342-2333-4444-8888-111111111111 └─md0 LVM2_member 57e241ad-aee3-4486-8eaa-222222222222 └─vg_data-lv_shared ext4 048b529c-2e39-4f49-83c9-333333333333 /home/shared
This is fine if there is a hardware failure on one of the data disks, but how do I go about creating an offsite backup
of the above setup?
The backup must be able to restore the entire system completely if something went wrong using just the offsite backup.
After reading up lots on the subject I found the following options but as I am completely new to this and want to ask and see what the community would recommend from their experience.
1) LVM snapshots
2) Duplicate one of the RAID drives. EG: (where sdd is my offsite backup physical disk.)
dd if=/dev/sdb of=/dev/sdd bs=64K conv=noerror,sync status=progress
What would the recovery process look like for the above backup methods?
I am really stuck on this and any pointers/links to relevent articles/suggestions would be really appreciated as I've spent a lot of time trying to figure out what to do, and my comfort zone is nowhere to be seen.
Thank you for reading my question and I hope it makes some sense to someone!
If I were to use rsync wouldn't I loose the Logical Volume Management scheme. A new problem also arises if you imagine that I expand the above setup to contain 3 pairs of RAID1. I then add those to expand total capacity of the logical volume. I would need to rsync the logical volume mount point (to copy all data) which would then contain 3 hard drives worth of data. This would need to be copied to span over multiple offsite drives (as I don't have a single drive that has the capacity of all 3 drives.) Is this possible using rsync. The more I think of this problem the only solution I can think of is making a backup server with the same configuration located offsite?