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:sp...@co.henrico.va.us] 
Sent: Wednesday, September 15, 2010 7:05 PM
To: WEAVER, Simon (external); veritas-bu@mailman.eng.auburn.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-boun...@mailman.eng.auburn.edu
[mailto:veritas-bu-boun...@mailman.eng.auburn.edu] On Behalf Of WEAVER,
Simon (external)
Sent: 15 September, 2010 02:00 PM
To: veritas-bu@mailman.eng.auburn.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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