Netbackup 188.8.131.52 on Windows 2008 r2 - slow performance from DSSU to tape
I have a new Windows 2008 r2 server running Master&Media server v184.108.40.206.
I have a Arcvault 12 tape library - which Windows 2008 r2 sees correctly in Device Manager and I have installed the latest HP drivers (v220.127.116.11) for the Ultrium LTO 4 that is in that library.
Backing up clients to a DSSU (basic disk). That appears to work really well.
I can backup the DSSU to tape and everything works, except the tape drive backup speed is rock bottom - around 2MB/sec.
Running HP's tape tool on the system to test outside of NB, I get tape write speeds around 70MB/sec.
I've tried different SIZE_DATA_THIS and NUMBER_DATA_THAT settings with no tape write speed changes.