On Thu, Aug 07, 2003 at 04:54:21PM +0100, Joe Thornber wrote: > This scheme only works if you don't use the device while you are > taking an incremental backup. I think the real solution will be based > around snapshots. Right. But I think the point is this: one won't mind keeping multiple (tower of hanoi) long-lived (week or more) block change indices, because the performance impact should be very low. When it it time to do an actual backup, we simultaneously create a new block change index, take a regular snapshot, and freeze (or copy) the block-change index of interest. Then we just back up the blocks from the snapshot volume indicated in the frozen block-change index and then delete the frozen block-change index and the snapshot volume. For a typical filesystem, the snapshot volume persists for seconds to minutes while the data is copied, not the tens of minutes to hours often required to traverse the whole device with a tool like dump(8). Regards, Bill Rugolsky _______________________________________________ linux-lvm mailing list linux-lvm@sistina.com http://lists.sistina.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
