Re: tapetape (not in faq-o-matic)
2006-05-25 08:57:41
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
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