Forum Discussion

spenukon's avatar
spenukon
Level 4
12 years ago

Slow backup performance

Hi   We have extremely slow performance in our new netbackup environment. It cannot do more than 8mb/sec. We don't have many clients running backups on this except few NDMP shares and nbu servers...
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  • Nicolai's avatar
    Nicolai
    12 years ago

    0/12/2012 04:51:11 - Info bptm (pid=7528) using 1024 data buffer size

    You need to check this value  - it shoud be 262144. If the backup really use 1K block size it will be very very slow. Check SIZE_DATA_BUFFERS_NDMP on the media server that control the NDMP backup.

    more info on SIZE_DATA_BUFFERS_NDMP http://www.symantec.com/docs/TECH147938

mph999's avatar
mph999
Level 6
12 years ago

Here we are:

10/12/2012 07:51:14 - Info bptm (pid=3066) waited for full buffer 974900 times, delayed 975018 times

There are a lot of 'delays', we see that bptm is waiting for a full bufer, which means the data isn't being sent from the client very quickly.

The most likely causes are :

1.  Data read speed of the client

2. Network (this can includenetwork settings in the os and possibly network buffer size setting)

But ...

10/12/2012 03:10:49 - Info bptm (pid=3066) using 1024 data buffer size

10/12/2012 03:10:49 - Info bptm (pid=3066) using 30 data buffers

On the media servers create these files :

/usr/openv/netbackup/db/config/SIZE_DATA_BUFFERS

Put the value 262144 in this file

/usr/openv/netbackup/db/config/NUMBER_DATA_BUFFERS

Put the value 128 in this file

(Nicolia has covered the ndmp tuning file )

Re-run a backup that uses this media server - does it go any quicker.

Martin