Veritas-bu

[Veritas-bu] NB51MP3 high cpu loads caused by bpdm?

2005-07-06 18:00:09
Subject: [Veritas-bu] NB51MP3 high cpu loads caused by bpdm?
From: Gregory.Geyer AT Avnet DOT com (Geyer, Gregory)
Date: Wed, 6 Jul 2005 15:00:09 -0700
Kathy,

I believe SIZE_DATA_BUFFERS and NUMBER_DATA_BUFFERS are for bptm only.
I've only just discovered "SIZE_DATA_BUFFERS_DISK" and
"NUMBER_DATA_BUFFERS_DISK" for use by bpdm.

However I also experienced shared memory issues with these as we're a
heavy disk-staging shop.  These might help your speeds, though I don't
know about offloading your CPU.

Reference Document ID 273532 for the above info.

G. 

-----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 Kathryn
Hemness
Sent: Wednesday, July 06, 2005 2:38 PM
To: veritas-bu AT mailman.eng.auburn DOT edu
Subject: [Veritas-bu] NB51MP3 high cpu loads caused by bpdm?

Greetings --

I am running NetBackup 5.1 MP3 on a Sun V240 and using Sun StorEdge 3511
storage arrays with 6TB capacity for backups to disk (not using the
disk-staging configuration).  The OS is Solaris 9.
The backups are first written to the storage array and then staged to
tape using cron-script managed duplications so that I can use
backupid-files containing backupids having the same retentions to
minimize tape mounts.  My tape library is a Qualstar 88264 LTO2 library
with 3 LTO2 drives.

To optimize read and write speeds the storage arrays, I alternate
directing all active backups to one storage array while staging
diskimages to tape from the other storage array.  I'm able to alternate
the active backup storage unit daily.

In order to complete all of the backups during typical non-workday
hours, I've set NUMBER_DATA_BUFFERS to 24 and SIZE_DATA_BUFFERS to
262144.

The backups are finishing in their configured windows, but the CPU load
is extremely high. The uptime commands shows a load of 25-40 all during
my backup windows and top shows the bpdm processes as using 1.0-1.4
percent of the CPU.

I'm curious to see if there are others seeing high loads caused by bpdm
whis is used for both disk and disk-staging storage units.
I'd like to hear about how others are configuring NetBackup for backups
to disk, mostly regarding the size of the disk storage units,
NUMBER_DATA_BUFFERS, SIZE_DATA_BUFFERS, and number of concurrent jobs.

Thanks for any information you can give me.

--kathy

_______________________________________________
Veritas-bu maillist  -  Veritas-bu AT mailman.eng.auburn DOT edu
http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu