Forum Discussion
Hi cian
Tape subsystem performance has been discussed at VOX at lot of times. You may want to do searches for clues.
Also the "backup planning and performance tuning guide is worth reading":
https://www.veritas.com/support/en_US/doc/21414900-146141073-0/index
The number 1 tweak to look for first:
What is SIZE_DATA_BUFFERS and NUMBER_DATA_BUFFERS set to ?
Default on SIZE_DATA_BUFFERS i 262144 and for NUMBER_DATA_BUFERS value is 64. Try increasing the value to 512.
https://www.veritas.com/support/en_US/article.100008276
Please change for all media servers.
Then second, we need to look at the "waited for" messages in the job activity monitor. Why - well we don't know if data is coming in to slow or out to slow. But we can get a indication
Waited for full buffer - data coming in to slow
Waiting for empty buffer - Writing to tape is a issue.
https://www.mass.dk/netbackup-guides/netbackup-buffer-tuning-2/
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