uninterruptible sleep

["Mr. Dan" <bitsandbytes88@xxxxxxxxxxx>]

Hi,

When I run an online-backup  script(v810) on SLES, the process immediately 
goes into the 'D' STATE.
The backup finishes in a couple of hours.   The backup is good and I can 
restore.  Why does it do that though?   If I run the backup script at 12:20 
AM instead of 1:20 AM it finishes in 20 minutes instead of 2 hours.  When I 
run ps auxr, I don't see any weird process running between 1-3 AM that seem 
inauspicious.

~DjK