HappyLife.sg

Performing backup of your logical volume is pretty easy and fast. It is the safest way to backup any “open” files/databases.

1) Creating a snapshot of your current LVM

[root@svr2 ~]# lvcreate -L1000M -s -n volbackup /dev/VolGroup00/datavol
Rounding up size to full physical extent 1.00 GB
Logical volume “volbackup” created

2) You should see lvdisplay stating the snapshot LVM.

[root@svr2 ~]# lvdisplay /dev/VolGroup00/volbackup
— Logical volume —
LV Name /dev/VolGroup00/volbackup
VG Name VolGroup00
LV UUID H1s7bn-TKCu-sdfE-Xi0M-oZNA-ixvq-xsWvZj
LV Write Access read/write
LV snapshot status active destination for /dev/VolGroup00/datavol
LV Status available
# open 0
LV Size 100.00 GB
Current LE 3200
COW-table size 1.00 GB
COW-table LE 32
Allocated to snapshot 0.00%
Snapshot chunk size 4.00 KB
Segments 1
Allocation inherit
Read ahead sectors auto
– currently set to 256
Block device 253:4

3) Create a folder for it to do a proper mount.

[root@svr2 ~]# mkdir /backupvol
[root@svr2 ~]# mount /dev/VolGroup00/volbackup /backupvol

4) Do the backup now.

[root@svr2 ~]# tar -cf /root/datavol.tar.gz /backupvol

5) Umount, remove folder and delete the snapshot LVM

umount /backupvol
rm -rfv /backupvol
lvremove /dev/VolGroup00/volbackup

Hope this helps someone out there…