NUMBER_DATA_BUFFERS
So I've read the tuning guide, I've played around with different options for SIZE and NUMBER of buffers and I understand the formula of SIZE * NUMBER * drives *MPX as it relates to shared memory.
H...
Go higher - 64 is way to low. I run my media server on Linux as well. If you ramp it too high, you may hit the shared memory kernel limit and recive a status code 89 "problems encountered during setup of shared memory".
I use 262144 as SIZE_DATA_BUFFERS and at lest 512 for NUMBER_DATA_BUFFERS and NUMBER_DATA_BUFFETS_RESTORE.
Some test I did a few years ago when LOT3 was hot:
Before tuning: 19MB/sec (default values)
Second tuning attempt: 49MB/sec (using 128K block size, 64 buffers)
Final result: 129MB/sec (using 128K block size and 256 buffers)
And some notes:
http://www.mass.dk/netbackup/guides/49-netbackup-buffer-tuning.html
http://www.mass.dk/netbackup/quick-hints/58-shared-memoy-on-linux-staus-code-89.html
