On Jul 24, 2006, at 12:47 PM, Rob van der Heij wrote:
On 7/24/06, Adam Thornton <[EMAIL PROTECTED]> wrote:
It strikes me that file-level backups are generally a lot easier to
work with, and use less archival media.
File level backup is great for "oops backup" when you erased a few
files and want them back. I am not sure whether you ever tried to
restore the entire server from file level backups when you lost the
disk. Typically you will need to re-install a new system and then
restore your backups on top of that. Think about how that works for
many servers at the same time (because it probably must be a major
problem if you actually lost DASD).
It's not that bad.
You should have a rescue system--which it *IS* a good idea to do
volume backups of, and easy too because it's almost never running.
This system has authority to link EVERYONE's disks.
You bring it up. You attach disks in batches of however many you're
comfortable with (I've only ever done it with one client at a time,
but you certainly could do more). You format and then mount those
disks in the right layout relative to the mount point.
You do the restore of your files from the rescue system into the
mounted filesystems. Then you do a chroot, run zipl (zipl -b would
also work, I guess), unmount the file systems, detach the disks, and
do the next batch.
No, you don't want to try a restore onto the same devices that are
actually RUNNING the system you're restoring on to. But the nice
thing about VM is that it makes not doing that much, much easier than
it is on discrete systems.
Bacula also supports a Bootstrap Record feature, but this has not
been extended to work with s390. The idea there is that you get a
minimal system (on CD-ROM, as it stands) which has just enough smarts
to find your disks, ask for your Bacula server, and then request the
appropriate restore for that client (you have one bsr per client).
This would be neat to port.
Adam
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