Ok, since we are on this subject, I have been having some slow backups on
one of my NT clients.  Below is what I got from my bptm log.  Any
suggestions on what I need to increase/decrease here?  This is a large store
with over 1 million small files.  And yes it is a web server running IIS.
Thanks in advance for any suggestons.

18:39:12 [544.543] <2> write_data: writing block shorter than BUFF_SIZE,
2048 bytes
18:39:12 [544.543] <2> write_data: writing short block, 2048 bytes,
remainder 0
18:39:13 [544.543] <2> write_data: waited for full buffer 361 times, delayed
2909 times

Thanks,
Rick

-----Original Message-----
From: David A. Chapa [mailto:david AT datastaff DOT com]
Sent: Monday, December 18, 2000 10:30 AM
To: Jim VandeVegt
Cc: NetBackup Veritas
Subject: Re: [Veritas-bu] NUMBER_ & SIZE_DATA BUFFERS


Jim:

Before I would change the NUMBER and SIZE, I would 
create a bptm logging directory.

/usr/openv/netbackup/logs/bptm

this should be created on each of your media servers 
(including any master that has netbackup controlled 
devices).

this log will let you know how your buffer situation 
looks.

For one of my clients, I have found that the defaults 
were just about fine, with a slightly different 
orientation.

instead of the 8x64 I tried 16x32 (most of the backups 
use multiplexing).  This increased the speed quite a 
bit and using the bptm logging directory you are able 
to measure those results accordingly.

My 2 cents.

David Chapa

Quoting Jim VandeVegt <vandevegt AT yahoo DOT com>:

> Can other readers share what your NUMBER and 
SIZE_DATA_BUFFERS are in
> /usr/openv/netbackup/db/config?
> 
> My master server is a Sun 450, 1 GB RAM, 2x 400 MHz 
processing. 
> Shared Memory MAX is set to 1GB in /etc/system. Six 
tape drives.
> 
> I recently noticed my backups were going pretty slow 
and I realized I
> didn't have these two files in place, thus I was 
using the default
> 8x32KB buffers. I remembered from my NetBackup class 
that almost
> everyone increases the size of the buffers and 
usually decreases the
> numbers, but maintains a great increase in the total 
size of the
> buffer (size times number).
> 
> I tried 4 buffers 1048576 bytes (2^20 = 1 MB) big. I 
noticed a
> speedup in backups, but some NT clients started 
throwing errors.
> 
> Most of the errors are 174, a media manager error, 
which doesn't make
> a lot of sense; and a few error 41 (network 
connection timeout).
> 
> But I haven't fully diagnosed the errors net in the 
log files. I'm
> more interested in what other installations use for 
the buffer settings.
> 
> =====
> Jim VandeVegt
> vandevegt AT yahoo DOT com vandevegt AT avaya DOT com
> http://members.xoom.com/vandevegt
> Toilet paper should come off the front!
> 
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
David A. Chapa
Consulting Manager
DataStaff, Inc.
847 413 1144
_______________________________________________
Veritas-bu maillist  -  Veritas-bu AT mailman.eng.auburn DOT edu
http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu