[Veritas-bu] Improving backup performance to a disk STU

Oh you could MPX to disk if you REALLY WANTED TO...but why?

Well I do know of a great integrated disk and tape solution... ;-)

Mark there is a tuning parameter for the disk in NBU 5.0 that you may be
able to play with...

SIZE_DATA_BUFFERS_DISK
NUMBER_DATA_BUFFERS_DISK

Naturally before doing that log bpdm in /usr/openv/netbackup/logs/bpdm
and see what the log says about your current settings.



David A. Chapa * ADIC * 720.249.5836 * 720.272.8452 cell *
david.chapa AT adic DOT com

HIGH PERFORMANCE, SCALABLE, RELIABLE - http://www.adic.com/gopathlightvx


-----Original Message-----
From: veritas-bu-admin AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu] On Behalf Of
Mark.Donaldson AT cexp DOT com
Sent: Wednesday, July 21, 2004 3:39 PM
To: scott.kendall AT hospira DOT com; Dan.Otto AT veritas DOT com
Cc: veritas-bu AT mailman.eng.auburn DOT edu
Subject: RE: [Veritas-bu] Improving backup performance to a disk STU

18 Streams from a single NFS mounted filesystem (they're crazy in love
with
NFS around here) writing to a different single NFS mounted filesystem
(disk
STU) on the same server (acting as its own media server).

Each filesystem, source & destination, is on a different filer but both
are
accessed through the same gigabit ethernet connection.

And, Dan, multiplexing only applies to tape drives so I'm not doing it
on
the disk STU.

-M

-----Original Message-----
From: veritas-bu-admin AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu]On Behalf Of Kendall,
Scott APX
Sent: Wednesday, July 21, 2004 3:22 PM
To: Dan.Otto AT veritas DOT com
Cc: veritas-bu AT mailman.eng.auburn DOT edu
Subject: RE: [Veritas-bu] Improving backup performance to a disk STU


18 streams FROM the server, but how many going TO each disk storage unit
(how many concurrent jobs is the Storage Unit configured to handle)...
18?

Writes to disk aren't multiplexed the same way writes to tape are.  I
wouldn't expect 18 streams to disk to be faster than 18 streams to tape,
especially if it's a newer tape technology and most definitely if it's
parallel ATA your writing to.


- Scott


-----Original Message-----
From: Mark.Donaldson AT cexp DOT com [mailto:Mark.Donaldson AT cexp DOT com] 
Sent: Wednesday, July 21, 2004 1:58 PM
To: Dan.Otto AT veritas DOT com
Cc: veritas-bu AT mailman.eng.auburn DOT edu
Subject: RE: [Veritas-bu] Improving backup performance to a disk STU

18 simultaneous streams (client-side push using bpbackup with a
filelist).
Using 10 streams took a bit longer so fewer streams does not increase
performance.
-M

-----Original Message-----
From: Dan Otto [mailto:Dan.Otto AT veritas DOT com]
Sent: Wednesday, July 21, 2004 12:54 PM
To: Donaldson, Mark - Broomfield, CO
Subject: RE: [Veritas-bu] Improving backup performance to a disk STU


Are you using multi-streams in the backups to disk? That can cause the
disk to thrash and slow things down.

-----Original Message-----
From: Mark.Donaldson AT cexp DOT com [mailto:Mark.Donaldson AT cexp DOT com] 
Sent: Wednesday, July 21, 2004 1:41 PM
To: veritas-bu AT mailman.eng.auburn DOT edu
Subject: [Veritas-bu] Improving backup performance to a disk STU

Any suggestions for increasing the performace of backups to a disk
storage
unit?

I've recently switched a backup from tape to disk and experienced a ~20%
increase in backup times.  Any disk-specific tunables you're aware of?

-M

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