Christopher Linn wrote:

> after getting these, i went and did what i should have done in the
> first place: build and run tape-src/tapetype  ;*)  here's what
> tapetype generated for me (no hardware compression of course):

Are you really really sure the hardware compression is really off?

> 
> # tapetype -e 50g -f /dev/rmt/1 -t SDX-500C
> wrote 1392640 32Kb blocks in 85 files in 8025 seconds (short write)
> wrote 1392640 32Kb blocks in 170 files in 7998 seconds (short write)
> define tapetype SDX-500C {
>     comment "just produced by tapetype program"
>     length 43520 mbytes

This is about the amount if hardware compression is ON!

>     filemark 0 kbytes
>     speed 5562 kps
> }
> 
> so i guess that must be 50 x 1000 x 1000 x 1000 bytes on the tape,
> and not 50 x 1024 x 1024 x 1024 bytes :*)))

yes, usually vendors use "Marketingbytes", which have 1000 in a kilo.

> 
> hardware is COMPAQ branded SDX-500C tapedrive in a COMPAQ
> StorageWorks SSL2000 series library, attached to a Sun Ultra60
> 450MHz/512Mb using a SunSwift(tm) PCI Adapter card in the 66MHz
> pci slot as the SCSI interface, Solaris 8 is the OS.  amanda
> version (tapetype cmd) is 2.4.2 release.

Did you adapt the file /kernel/drv/st.conf to define your tapedevice?
If not, that's probably the reason why you have hardware compression
on.  



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Paul Bijnens, Lant                                 Tel  +32 16 40.51.40
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