We have a physical RedHat server with two 60GB local disks, and two RAID 1 devices on them. There are also a few multipathed SAN luns.
Disk /dev/sda: 60.0 GB, 60022480896 bytes Device Boot Start End Blocks Id System /dev/sda1 * 1 2628 21101568 fd Linux raid autodetect /dev/sda2 2628 4598 15825920 fd Linux raid autodetect /dev/sda3 4598 7298 21686272 82 Linux swap / Solaris Disk /dev/sdb: 60.0 GB, 60022480896 bytes Device Boot Start End Blocks Id System /dev/sdb1 * 1 2628 21101568 fd Linux raid autodetect /dev/sdb2 2628 4598 15825920 fd Linux raid autodetect cat /proc/mdstat Personalities : [raid1] md1 : active raid1 sda2 sdb2 15824828 blocks super 1.1 [2/2] [UU] bitmap: 1/1 pages [4KB], 65536KB chunk md0 : active raid1 sda1 sdb1 21101496 blocks super 1.0 [2/2] [UU] bitmap: 1/1 pages [4KB], 65536KB chunk unused devices: <none> Filesystem Size Used Avail Use% Mounted on /dev/md0 20G 9.0G 9.9G 48% / /dev/md1 15G 13G 1.2G 92% /u01
The server is located in a vendor site, so we dont have direct access. We are planning to upgrade the OS from 6.3 to 6.5 and would like to take a backup of the root FS, in case we need to revert back. If this were a VM, we could take a snapshot before patching. Since this is a client system, we dont have permission to install any third party tools.
I have a few thoughts in mind, but am not sure if it is the right approach.
- Do either a
ddof the FS or device
- Copy across the image to
'somewhere'. Not sure if I can copy to a lun, because multipath devices may not be accessible in rescue mode
- In case a restore is needed, boot into rescue and restore from saved image
Does this sound right? Where would that