Hi,

this is just to update the current state.

I replaced the bitchy SLR7 with a brand-new SLR7 (same firmware version) and
it works without hardware-compression! I replaced the Harddisk in the backup
machine with a WinXP drive, installed the Tandberg tools and I switched off
HW-comp. Then I switched back to Linux. amtapetype resulted in:

define tapetype SLR7 {
    comment "just produced by tapetype prog (hardware compression off)"
    length 18889 mbytes
    filemark 0 kbytes
    speed 2848 kps
}

That's fine, isn't it.

Therefore I will have to send the old SLR7 back to Tandberg Germany for a
repair, which will cost 250 EUR lump-sum because it's older than 3 years.
:-( Well, never touch a running system.

Best regards
Uwe


> Matthias Andree writes:
> > This looks strange. Is the drive in auto-retension mode and 
> rewinding
> > the tape again and again?
> 
> No, I typed 'su amanda -c "/usr/sbin/amtapetype -c -e 20g -f 
> /dev/nst0'
> 
> > Does your drive have current firmware? Check tandberg.com.
> 
> This is worth a try, good idea.
> 
> > ship 3 MB/s out to the drive. If you're using an IDE drive to spool,
> > check if it uses DMA with hdparm -I and perhaps turn it on 
> with hdparm
> > -d1 /dev/hda; and perhaps with hdparm -u1 /dev/hda set the "unmask
> > interrupts" flag. It is said to not work on all hardware, but 
> > I have yet
> > to find a hardware combination where -u1 didn't work.
> 
> I will check that on Monday, too. Before starting my 
> experiments trying to
> switch off compression I was quite happy with the drive and 
> the speed. The
> only thing what bothered me was the need to adjust the drive 
> capacity in
> amanda.conf several times taking into account that hw-compr. 
> forced me to
> guesstimate the tape length.
> 
> Best regards
> Uwe
> 
> 
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