Thanks.  I'll give the DISK BUFFER settings a try.  I was kind of
wondering if a smaller buffer size might be better.


On Wed, 6 Jul 2005, Geyer, Gregory wrote:

> Date: Wed, 6 Jul 2005 15:00:09 -0700
> From: "Geyer, Gregory" <Gregory.Geyer AT Avnet DOT com>
> To: Kathryn Hemness <kfhemness AT ucdavis DOT edu>,
>      veritas-bu AT mailman.eng.auburn DOT edu
> Subject: RE: [Veritas-bu] NB51MP3 high cpu loads caused by bpdm?
>
> 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
>
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>

--kathy