NW 7.4 SP2, Win2003
On our main SAN, we enumerate the folders to be backed up, rather than
just specifying ALL (or in our case, "H:"). We do this for speed reasons -
it's a lot faster to do this, rather than specifying a saveset of ALL. I'm
told that ALL backs up folders in sequence, while enumerating them (in
conjunction with parallelism) makes them back up in parallel, rather than
sequence.
Have I got that right?
Well, you can see what's coming ... there was a folder on the drive that
was not in the saveset list, and hence not backed up.
So my question ... I'd much prefer to just say "H:" as the saveset, and
get whatever is on the drive, and I won't need to change the saveset list
whenever a folder is added.
However, we're talking about a total amount of data in the range of 1 TB.
This is a AFTD storage node, so we back up to disk, and then clone to a
SDLT-600 library that is attached to the NW server. We do daily level 1
backups, and full on Friday (no way do the fulls finish in enough time
overnight). I think the daily Level 1 backups wouldn't be a problem -
right now, the longest it takes to back up the folders by enumerating them
is about 90 minutes (to disk, and then it clones to tape), so not
enumerating the savesets should still make them finish in the backup
window (6PM to about 7AM, more or less).
Here's a full backup on Friday:
Start time: Fri Oct 24 18:15:00 2008
Clone Start: Sat Oct 25 06:07:15 2008
End time: Sat Oct 25 15:38:01 2008
So ... if I specify a saveset of "H:", what other settings can I do to
ensure that I continue to get parallel saveset backups (i.e., that H:\A,
H:\B, H:\C are all backing up at the same time)? Is there some way I can
estimate how long? Or some setting (such as client parallelism) that will
give me most of the same speed I am getting now?
Client parallelism for this client is currently 12; savegroup parallelism
is 0 (this is the only client in that group). Server parallelism is 32.
Number of top level folders is currently 28.
I realize I am displaying what to some is a stunning lack of knowledge,
but please bear with me. :-)
Any suggestions welcome
--
Michael Leone
Network Administrator, ISM
Philadelphia Housing Authority
2500 Jackson St
Philadelphia, PA 19145
Tel: 215-684-4180
Cell: 215-252-0143
<mailto:michael.leone AT pha.phila DOT gov>
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