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Solaris 10 master/media, NBU 6.5.6, Quantum Scalar i500 library with LTO5 tape drives and 1 LTO3 tape drive. Library is partitioned into 200 slots
with the LTO5 drives & encrypted (robot 1), and 180 slots with the LTO3 drive (robot 2).
I just implemented an i500 library and compared with the old STK L180 (robot 0), I am noticing a markedly increased latency in operations that talk to the robot via TLD. (The i500 robot moves slower
than the L180, but I am referring to the time needed just to get it to move. I am not that concerned with the slower feed rate.)
Examples:
* Doing a vault deferred eject. I observed a 2-3 minute delay from the activity monitor details saying it was ejecting and the robot starting to move tapes into the IE slots. I never really timed the L180 when using
it for vault, but the librarians never complained about it.
* Robot inventory without update and without IE cleanout. I timed two each. The L180 was 8s & 12s. The LTO5 virtual library was 20-25s. The LTO3 virtual library was 25-30s.
* Ran from the command line: echo "s s"|time tldtest -r /path/to/robot/control. L180 was 1.4s. LTO5 was 17.5s, LTO3 was 25.2s.
IO for tape operations is good. The i500 utilizes LUN 1 on one of the tape drives in the partition to control the robot. (Attempting to eliminate fabric communication as an issue.)
Not seeing any errors in /var/adm/messages.
Ability to view a log / enable a log somewhere? I looked under netbackup/logs. The mklogdir script does not create anything obvious for this. Did not see anything under /usr/openv/volmgr either.
It points to the library being the problem, but I want to make sure I have investigated NetBackup as well.
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