I manage a CentOS 4.8 server for a small workgroup. Last year I converted the filesystem to LVM over software RAID (RAID 1, two mirrored drives).
I now have the following filesystems on LVM/RAID:
/dev/mapper/vg-home 619G 231G 358G 40% /home /dev/mapper/vg-tmp 7.9G 55M 7.5G 1% /tmp /dev/mapper/vg-usr 7.9G 2.7G 4.9G 36% /usr /dev/mapper/vg-var 7.9G 3.1G 4.5G 42% /var
To back these filesystems up, I use rsnapshot and a couple of external 2TB USB drives that I rotate weekly. In practice that has worked very well. I have rsnapshot configured to do snapshots every four hours.
Given that configuration, should I also consider doing LVM snapshots? Are LVM snapshots more efficient? Could I be doing them more often than the rsnapshot backups every 4 hours without significantly impacting system performance?
I am aware that LVM snapshots could be used to ensure database consistency for backups, however this server doesn't run a database so that isn't really a concern.
It seems like there might be a way to do both LVM and rsnapshot backups in a complimentary fashion but I am unable to suss it out.