Change in Netbackup buffer size

[prats]

Hi,

We need to do a change in Netbackup buffer size to tune our backups.

Does it need a quiet time to implement the changes?

Guess, active backups will get affected if changes are not done during quiet time?

Thanks for all the help.

Regards

Padmaja.

[Marianne · Accepted solution]

A change will not affect current backups.

Buffer sizes are determined for each individual job before the actual data transfer is started and is used for the duration of the job. Evidence can be found in bptm log.

New jobs that are started after the change will use the new settings.

[Nicolai]

You can verify the buffer setting by doing a :

findstr "io_init" {logdate}.log  for Windows

or

grep "io_init" {logdate}.log

in the bptm log located in [install_paht]\netbackup\logs\bptm

e.g:

10:26:15.157 [4168] <2> io_init: found index: 1
10:26:15.158 [4168] <2> io_init: using 262144 data buffer size
10:26:15.158 [4168] <2> io_init: CINDEX 1, sched Kbytes for monitoring = 40000
10:26:15.158 [4168] <2> io_init: using 512 data buffers

[prats]

Ok. and what about no.of buffers?

Does this hold true for change in number of buffers as well?

Regards

prats.

[Marianne]

Correct. Check bptm log as per Nicolai's example.

SIZE_DATA_BUFFERS :  io_init: using 262144 data buffer size 
NUMBER_DATA_BUFFERS  : io_init: using 512 data buffers

[prats]

Thanks for the reply

Changed the buffer size and active jobs were ok.

But after changing the no.of buffers on the media server some jobs failed with status code 174 - media manager - system error occurred data buffers out of sequence,expected number 913272,received 1 and some with status code : 13 - file read failed.

Re-runs were ok.

Regards

Prats.

[Nicolai]

I always a good thing to do test restore before and after changing SIZE_DATA_BUFFERS - just to be sure you still can read the backups.

Better safe now than sorry in ½  year :D

[prats]

solved