On 7/24/06, Carsten Otte <[EMAIL PROTECTED]> wrote:
Well, that is what the device-mapper snapshot target is for: a) make a snapshot, which is very fast because it does not actually copy data b) use dd to copy the snapshot to a backup dasd while writing to the original disk c) destroy the snapshot again
Yes, when you are making the backups from within the Linux system itself, there are many options to make backups of a running system that are more or less useful to restore your data. The snapshot through device-mapper at least gives you a backup that is as good as what you get when you pull the plug. But I think we were talking about doing backup from the outside. I have looked in the past at options with LVM to suspend writing dirty pages to disk, signal something outside Linux to take the physical backup, and tell LVM to resume writing to disk. We did not implement it because the process appeared a bit risky. Rob ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
