Forum Discussion

pmj's avatar
pmj
Level 3
12 years ago

Improving NDMP performance across multiple jobs

Hi, First off, I've gleaned a ton of information from this forum that has helped me solve some tough problems. I have one that I haven't found an answer for or I totally missed...... I am backing...
7.1.x and Earlier
AIX
Backing Up
Backup and Recovery
NetBackup
  • Mark_Solutions's avatar
    Mark_Solutions
    12 years ago

    One thing you may have missed, as you have covered your touch files in good detail is this one:

    SIZE_DATA_BUFFERS_NDMP

    NUMBER_DATA_BUFFERS_NDMP

    A nice description of them and how / if you can use them is here:

    http://www.symantec.com/docs/HOWTO56077

    Hope this helps

smurphy's avatar
smurphy
Level 4
12 years ago

NDMP performance troubleshoting can be very dfficult. Other than the BUFFER settings, nothng else in the software will alter it.

First, create a SIZE_DATA_BUFFERS_DISK file in netbackup/db/config and set it to 262144. SIZE_DATA_BUFFERS pertains only to tape.  It would be a very worthwhile test to try this backup to a physical tape storage unit, if you have one available.

NUMBER_DATA_BUFFERS set to 128 is rather high, I would throttle that back to 64 to start.

The one stream on the Celerra that does not get good thoughput, what happens if you run that standalone, no other backup jobs running?

Another test would be an archive-to-null.  On the Celerra, it would be something like this:

server_archive <datamover name> -w -f /dev/null/-J <file path>

I have no idea what it is on the IBM.  Run this and note the timing.