On Friday 24 January 2003 11:11, Martin Oehler wrote:
>Hi!
>
>Am Fre, 2003-01-24 um 16.22 schrieb Gene Heskett:
>> On Friday 24 January 2003 08:53, Martin Oehler wrote:
>> >Why is the length the same? Seems like switching the
>> > compression modes with mt is not working.
>>
>> It was still on?  You didn't say that you had turned it back off
>> above.  Maybe this drive has a compression scheme like the DDS
>> drives do, whereby it records the compression status in a hidden
>> header, and resets it to match that tape when the tape is next
>> scanned at insertion.  In which case see my rough outline of
>> what it takes to turn those flags off, in a previous message
>> earlier today.
>
>I'm sorry, I made a mistake. The hardware compression was off
>all the time. :(
>
># mt -f /dev/nrmt0 datcompression 0
>Compression off.
># mt -f /dev/nrmt0 datcompression 1
>Compression off.
>
Odd.  You must have a different version of mt than I.  Mine is 
silent when it does accept the keyword, but doesn't even recognize 
the datcompression keyword, spitting out its help screen instead.  
I have mt-st version 0.7

>I looked at IBMs ressources, but they offer drivers only for
>RedHat and older SuSE distributions, but I'm using SuSE 8.1 .
>Is it possible that the drive is that slow because I'm using
>native linux drivers?
>
>> >Additionally, I can't understand why the speed is that slow.
>> > The drive should write about 15 MB/sec without HC. Is it
>> > possible to ignore the measured speed and use the one from the
>> > datasheet of the tape?
>>
>> How fast is the interface?  Maybe it can't to 15 megs a second,
>> older scsi stuff was hard pressed to do 5 megs, often less. 
>> Much less.
>
>The interface is an Adaptec AIC-7899P U160.
>
>> >The used amanda version is amanda-2.4.3 .
>>
>> Which snapshot?  It should have a date string after the 2.4.3.
>
>The newest entry inside the ChangeLog is 2002-10-07.

Pretty ancient by now.

You might try the last 2.4.3-datestring snapshot from Jean-Louis's 
site at umontreal.  The link is near the bottom of the page at 
amanda.org.  Bookmark it.  I've been running the last snapshot from 
there, usually within a day of its release for > year without any 
surprises I couldn't live with.  But speed isn't somethng I can 
check as my dds2 changer can only do 400kps & that doesn't 
certainly doesn't strain anything except my patience. :(

-- 
Cheers, Gene
AMD K6-III@500mhz 320M
Athlon1600XP@1400mhz  512M
99.22% setiathome rank, not too shabby for a WV hillbilly