Hello Simon,
Unfortunately very slow restores is the biggest problem of
flashbackup backups.
The backup is very fast. And the restore of the volume is very fast.
But when you try to restore a file, then you may wait more time than the
time to restore the volume. Netbackup reads the backup serially, to find the
files.
Check this (in the new ugly and cannot search symanetc support
site)
http://www.symantec.com/docs/TECH53111
Note: Individual
file restore from a raw FlashBackup backup will perform much more slowly than a
restore of the entire partition, and the performance decreases exponentially the
more individual files that are selected for restore. One way to increase
performance is to configure the 'Maximum fragment size' on the Storage Unit to a
small size such as 1GB or even 500MB (prior to the backups of
course).
stefanos
From:
veritas-bu-bounces AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-bounces AT mailman.eng.auburn DOT edu] On Behalf Of WEAVER,
Simon (external)
Sent: Thursday, September 23, 2010 9:29
AM
To: veritas-bu AT mailman.eng.auburn DOT edu
Subject:
[Veritas-bu] FlashBackups - Q & A:
Hi
A fellow
member has kindly guided me into the right direction of using FlashBackps.
However I have a few Questions to clarify if poss.
Environemnt,
all Windows 2003 SP2 + NBU 6.5.6 - Running Eval License of NBU to open up
FlashBackup-Windows
I have
tested the product, and moved the tests into production (to gain full access to
Robot+Drives+San Media Servers).
I ran a
test on a Network based Client of their E: Drive. It performed the FlashBackup
in 48mins. Looking at the full backup running under the normal client took 2
hours.
So
today, I have tried to do a restore of a 1GB folder containing lots of files.
But its taking what appears to be ages. 20 Mins in, and only recovered 300mb so
far.
Does
this sound correct?
Also,
when I create a Backup Policy, under the Policy -> Backup Selections Tab I
type in \\.\E: and
press return. I get a dialog box telling me that "The NetBackup Client Service
on the client must have a Log on account specified other than the system
account. the account used must have permission to create directories and files
under the UNC path specified. Do you wish to continues?"
I have
an account created, and applied this to the NetBackup Client Service and as I
mentioned, it has run. But if I create a brand new policy, add a client in the
Clients Tab, then goto Backup Selections and type in \\. \E: and press Enter I
do not get a pop up message. If you look carefully, I have put a SPACE after the
fullstop! But this seems to go against the NetBackup documentation I have that
does not appear to show a space.
Finally,
the purpose of this is for some of our large servers that have Multiple volumes.
Is there any problem selecting multiple drive letters under Backup selections
tab? In other words, rather than list 1, can I list 8 different
volumes?
Thanks
for the feedback.
Regards
Simon
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