Hey All-

We're running NBU 3.2 patch 466 on HP-UX 11.0 and we're seeing backup 
performance that seems unduly slow.

NBU performance is, of course, a complex concept with lots of pieces that 
could slow it down, but it looks pretty simply when I see the following 
results of local writes to /dev/null:

    #tar cf - /var > /dev/null
(writes at 18GB/hr)

    #/usr/openv/netbackup/bin/bpbkar -dt 0 -r 888 -nocont /var > /dev/null
(writes at 8 GB/hr)

We have noticed that disabling JFS Asynchronous I/O (via "echo 1 > 
/usr/openv/netbackup/AIO_READS_MAX") speeds up the above bpbkar to 11GB/hr.

And for what it's worth,  I don't see an NBU slowdown when reading the raw 
device:

   #dd if=/dev/vg00/rlvol8 of=/dev/null bs=32768
(writes at 84 GB/hr)

   #/usr/openv/netbackup/bin/bpbkar -dt 0 -r 888 -nocont /dev/vg00/rlvol8 > 
/dev/null
(also writes at 84 GB/hr)


Has anyone else already trod this path?
TiA
rob