Re: [Veritas-bu] Real World NBU Buffer settings Win2k3
2010-09-15 15:36:11
Jonathan
My comments about Flashbackups came from symantec rep, who
felt it would not be ideal.
The volumes are "windows" compressed, and hold over 1.7TB's
compressed data. Uncompressed and it could be around 3TB+
Maybe I could look into this more. But I did want to find
out if anyone had buffer settings recommended for large file system
backups.
Si
Actually,
Flashbackup is a life-saver on Windows compressed volumes. I have a 400GB volume
with 1.2TB of compressed data on it that used to take 36 hours to backup. I now
move that same amount of data via flashbackup in ~3 hours.
-Jonathan
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: Wednesday, September 15, 2010 2:07
PM To: Spearman, David;
veritas-bu AT mailman.eng.auburn DOT edu Subject: Re: [Veritas-bu] Real World
NBU Buffer settings Win2k3
Hi
David
Hmmm...
Thanks.
This is
very interesting. And also shoots my SLA's right out of the planet into a Galaxy
unknown to us!
Cannot
understand how we can recover a system is 2 days, when it takes double to backup
completely!
Have
also mixed with Multiplexing, and no joy!
I dont
think FlashBackups will help either, as its an array of small - medium - large
files.
Oh dear
:-(
Si
From: Spearman, David
[mailto:spe08 AT co.henrico.va DOT us] Sent: Wednesday, September 15, 2010
7:05 PM To: WEAVER, Simon (external);
veritas-bu AT mailman.eng.auburn DOT edu Subject: RE: Real World NBU Buffer
settings Win2k3
Simon,
For
what it’s worth
64kb
buffer size
128
buffers
Multiplex
6
LTO4
10GB
backbone/2Gb FC
I
have played around with all sorts of buffer sizes but in our mixed environment
64 works best.
But
4 days for 1.7TB seems more like the norm to me. We have several servers verging
on 1TB that can take 36 hours.
David
Spearman
County
of Henrico
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: 15 September, 2010 02:00 PM To:
veritas-bu AT mailman.eng.auburn DOT edu Subject: [Veritas-bu] Real World NBU
Buffer settings Win2k3
Hi
All Anyone
got any real world experience on buffer settings:
scenarion:
Win2k3
San Media, connected to 2GB Fabric attached 8 LTO4 Drives. Due to
drive availability, Multiplexing onto one drive.
Main
problem: One volume (1,7tb in size) takes over 4 days to fully complete.
Got the
Tuning Guide and Technote 244602, but I tried some settings, only to find the
backup would not even mount tape correctly.
So back
to "no" settings at the mo.
Volume
are generic files/folders, mixture of large and small sizes. But 1.7TB's in my
view should be done quicker. Also Data is compressed.
Regards
Simon
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