I strongly recommend you use the "Multiple-Tape NetBackup Catalog
Backups" method described on page 181 of the 4.5 FP3 Sysadmin for Unix
guide.

'bpbackupdb' does not use the buffer sizes specified in
/usr/openv/netbackup/db/config/SIZE_DATA_BUFFERS, rather defaulting to a
32k buffer, which really slows down LTO drives.

You'll still get a slow backup of the second pass, but it's a small
amount of data. The bulk of the catalog will write much, much faster.
This method increased my catalog backups to LTO-2 media from 3 MB/s to
60 MB/s.

matt

On Thu, 2004-04-08 at 15:14, Nardello, John wrote:
> Environment:
>       HP-UX 11.0 master server
>       NetBackup 4.5 FP4
>       HP Tachyon PCI FC HBA
>       Fibre IBM LTO1 drive in an STK L5500
> 
> Our catalog backups have always run a little long, but lately it seems to 
> have gotten even worse. Backing up our 83 GB catalog is taking around 6.5 
> hours now, which comes out to about 3719k/sec. Does anyone have any 
> suggestions for increasing the throughput rate of this backup ? The catalog 
> is cleaned up fairly often so there's not much I can do to shrink its size 
> without altering our retention periods. Only the master server is being 
> accessed for this, and the filesystem is off of an EMC. The backup is 
> triggered via CLI so we do have backups running during it (we just don't have 
> a 6 hour window of downtime daily). 
> 
> Any suggestions for improving the throughput rates would be appreciated. 
> Thanks. 
> 
> John Nardello
> T-Mobile USA
> Enterprise Backup Group
> 
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