On 10/13/06, Roger Lucas <roger@planbit.co.uk> wrote:
Hi Nick, RSYNC is useful for this, but it works at the file level. If you had, for example, a 1GB e-mail file (e.g. Outlook PST) or a large database file, and it was getting small changes every day (e.g. receiving a dozen 10KB e-mails => 120KB of changes), then RSYNC would quickly eat up your disk space as each backup taken with RSYNC a complete new copy of the whole 1GB file. Cascaded LVM snapshots, on the other hand, would allow the just the changes within the files to be kept, dramatically reducing the disk usage. I'm sure that you know this already, but it was worth explicitly stating the difference between RSYCN and LVM snapshots in case someone reading the list wasn't as sure. BR, Roger
For now, you may want to checkout rdiff-backup. It uses rsync like functionality to find deltas in your files and then it only backs up the deltas. IIRC, it actually keeps a current copy of your file, plus a series of deltas that let you get to older versions. Greg -- Greg Freemyer The Norcross Group Forensics for the 21st Century _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
