On Thu, Feb 27, 2003 at 11:43:21AM -0600, Damon LaCaille wrote:
> Hi everyone,
> 
> I am configuring an HP JetStore 6000 C1533 DDS-2 tape drive.  I have 4 of
> them in a SpectraLogic 10000 (BullFrog) tape library, with 60 slots.
> 
> I am running tapetype like this:
> 
> # ./tapetype -e 4g -f /dev/rmt/0bn -t "HP JetStore 6000 C1533"
> 
> It's been running for about 90 minutes and I'm estimating it's about 40% of
> the way done.

Well, IIRC, DDS2 drives from HP spec 500KB/sec (30MB/min, 1.8GB/hr).
Tapetype will have to write 4BG, rewind, write 4GB.  You do the math.

> My question:  Should I have used the compression device (/dev/rmt/0mbn or
> /dev/rmt/0hbn) instead of the non-compression device?  I've noticed a few
> posts that reference compression devices when running tapetype, but the docs
> say to use the regular device.

Somewhere in the tapetype docs it must say DO NOT USE HARDWARE COMPRESSION!

BTW on Solaris at least, /dev/rmt/0 (with no l,m,h,...) means use the default
density, not the lowest or no-compression density.  In my case, an HP DDS3
drive, the default 0 is the same as 0c, i.e. compression.

BTW it will not affect tapetype, but the "b" devices are not recommended
for use with amanda.

-- 
Jon H. LaBadie                  jon AT jgcomp DOT com
 JG Computing
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