[Gllug] Performance Tweaking of SCSI tape drives

[John Hearns]

On Wed, 2002-07-24 at 09:55, Huw Lynes wrote:
> On Tuesday 23 July 2002 19:31, you wrote:

> 
> > it is possible that the higher figure you mention is with software
> > compression. so its actually only transfering max 10Mbit over the
> > SCSI bus, but say 16Mbit of data but in compressed form...
> 
> It seems unlikely. On the SGI boxes we talk to the tape using mt and 
> tar. And I should have written MB not Mb as I was talking about bytes 
> not bits. 

I shouldn't chip in here,
but IIRC the specs for DTFs are quoted uncompressed - they really
are pretty impressive beasts.
I think sony claim a sustained rate of 24MB/sec (I could be wrong).
The tapes are the size of laptops, mind!

BTW, Googling for this just turned up this rather nice site
http://www.storagesearch.com/


IIRC, the biscuit is taken with an even bigger Sony drive, used by some
astronomy experiment in Japan, The tapes are the size of tea trays.





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