Jon,

On Wed, May 24, 2006 at 07:25:46PM -0400, Jon LaBadie wrote:
> On Wed, May 24, 2006 at 02:54:34PM -0400, Brian Cuttler wrote:
> > The -e made a huge difference in runtime.
> > # date ; amtapetype -e 400g -f /dev/rmt/3n ; date
> > Wed May 24 09:23:58 EDT 2006
> > Writing 2048 Mbyte   compresseable data:  33 sec
> > Writing 2048 Mbyte uncompresseable data:  33 sec
> > Estimated time to write 2 * 409600 Mbyte: 912 sec = 0 h 15 min
> > wrote 12386304 32Kb blocks in 189 files in 6539 seconds (short write)
> > define tapetype unknown-tapetype {
> >     comment "just produced by tapetype prog (hardware compression off)"
> >     length 386048 mbytes
> >     filemark 0 kbytes
> >     speed 61853 kps
> > }
> > 
> > I really should run it again with HW compresson ON.
> 
> If like my ultrium 1, the block count will be exactly the same,
> but the speed will be slower.

You are right, largely the same, run time of 3h 38 min and the speed
was a little lower, but only by about 1%, but I don't know enough 
about the amtapetype and maybe the pattern of the data written has
a lot to do with that.

> date ; amtapetype -e 400g -f /dev/rmt/3un ; date
Wed May 24 14:55:53 EDT 2006
Writing 2048 Mbyte   compresseable data:  34 sec
Writing 2048 Mbyte uncompresseable data:  33 sec
Estimated time to write 2 * 409600 Mbyte: 912 sec = 0 h 15 min
wrote 12320768 32Kb blocks in 94 files in 6320 seconds (short write)
wrote 12386304 32Kb blocks in 189 files in 6487 seconds (short write)
define tapetype unknown-tapetype {
    comment "just produced by tapetype prog (hardware compression off)"
    length 386048 mbytes
    filemark 0 kbytes
    speed 61742 kps
}
Wed May 24 18:33:20 EDT 2006

                                                thank you,

                                                Brian