We use 3590 B1A drives, with 10/30 carts providing native capacity of
10GB, with up to 30GB using hardware compression. I am under the
impression that the hardware will choose the best compression possible
UNLESS it is specifically told otherwise (i.e. via a TAPE COMP/NOCOMP
and DDR COMP/NOCOMP/LZCOMP options). Is this true, and is there a way
to query the hardware from z/VM (4.4) to see if default hardware
compression has been enabled on the drives (I imagine it has to be set
by the CE during install/configuration)?
I have a z/Linux user that was trying to dump 13GB of data and ran out
of space, so it looks as though default hardware compression is not
working. :(
-Mike
