Dave
I believe the marker could well be a file fragment tied in with the backup
policy and yes, if the backup fails after this "checkpoint", then when you
re-start the job, it knows to carry on from this point.
If however, you do a new backup in a different policy, I do not believe it
carries on from the checkpoint. and I think it starts again from the
beginning.
Other than that David, thats all I know !
Regards
Simon Weaver
3rd Line Technical Support
Windows Domain Administrator
EADS Astrium Limited, B23AA IM (DCS)
Anchorage Road, Portsmouth, PO3 5PU
Email: <mailto:Simon.Weaver at Astrium-eads.net> Simon.Weaver at
Astrium-eads.net
-----Original Message-----
From: Clooney, David [mailto:david.clooney at bankofamerica.com]
Sent: 11 December 2006 15:24
To: WEAVER, Simon; Veritas-bu at mailman.eng.auburn.edu
Subject: RE: [Veritas-bu] Checkpoint on backups.
Simon,
I understand what checkpoints are used for, what I'm trying to understand is
what exactly the "pitstop" you are talking about , is it another file number
on the tape?, or even a marker at the beginning of a new file.
I tend to sway to Martin's explanation where as it looks at the last
successful fragment and begins after that, my only question is "can the
fragments be overwritten as the backup has not completed and therefore the
final image not validated . what if other backups using the same pool
require tapes , how are these fragments protected until us mortals get in
say 9 hours later and then restart the job ??. If the fragments are
protected then potentially you could have useless data out there on tape as
images don't complete.
Could possibly the backup_id be created on checkpoint completion and the
fragments added to the same backup_id, don't know whether its possible, but
these are the questions I am trying to get answered.
Any ideas ?
Dave
_____
From: WEAVER, Simon [mailto:simon.weaver at astrium.eads.net]
Sent: 11 December 2006 15:12
To: Clooney, David; Veritas-bu at mailman.eng.auburn.edu
Subject: RE: [Veritas-bu] Checkpoint on backups.
Dave
Essentially, they are like "pit stops" - takes a pointer behind the scenes
of NBU.
For those unsure of what it does (even though most do!), If checkpoint is
enabled and it hits the "pitstop" at 450GB, a marker is set. If the backup
fails at 475GB, the restart happens at 450GB, rather than ALL THE way back
to the beginning of the backup job!
Thats what I understand about them, and I do use them for large TB backups.
Regards
Simon Weaver
3rd Line Technical Support
Windows Domain Administrator
EADS Astrium Limited, B23AA IM (DCS)
Anchorage Road, Portsmouth, PO3 5PU
Email: <mailto:Simon.Weaver at Astrium-eads.net> Simon.Weaver at
Astrium-eads.net
-----Original Message-----
From: Clooney, David [mailto:david.clooney at bankofamerica.com]
Sent: 11 December 2006 11:59
To: Veritas-bu at mailman.eng.auburn.edu
Subject: [Veritas-bu] Checkpoint on backups.
Hi,
Can anyone give a brief explanation of exactly what goes on when
checkpoint's are implemented on normal backup schedules. Understand what
they do but need to know what is going on in the background.
Cheers
Dave
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