How to calculate SIZE_DATA_BUFFERS
I'm looking into getting better performance on our backups.
I found this recent Community post that is quite interesting as I have exactly this problem.
Netbackup Data Consumer waiting for full buffer, delayed 2186355 times
And have played around with different values in SIZE_DATA_BUFFERS and NUMBER_DATA_BUFFERS
There is no change in the
09/18/2013 11:31:40 - Info bptm (pid=6079) waited for full buffer 42749 times, delayed 154422 times
Whatever numbers I change.
The size and number changes per new started backup if I change the values.
09/18/2013 10:36:46 - Info bptm (pid=6079) using 131072 data buffer size
09/18/2013 10:36:46 - Info bptm (pid=6079) using 32 data buffers
But it also depends on the network settings, tape drive, probably interface to the tapedrive (SCSI/SAS/FCAL) and the label on the tape.
There must be a certain way of calculating what should be the optimal/default/best value!?
Trial and error doesnt appeal to me that much.
Just getting rid of the waiting for full buffer should improve things a bit.
All Solaris 10 hosts, SCSI Sun StorageTek SL48 Tape library with 2xLTO4