[comp.periphs.scsi] Question about scsi transfers.

jweiss@casbah.acns.nwu.edu (Jerry Weiss) (05/04/91)

  Im rather new to the SCSI world, so please excuse my lack of familiarity
with SCSI terminology.

I'm about to embark on interfacing a SCSI based data acquisition system to a
NeXT. Im sure I am in for all sorts of thrills and spills, but one application I
have requires spooling data continiously from the acquisition unit to the
computer and storing in on disk.

Is it possible given the nature of SCSI to have the acquisition unit write 
directly to the disk drive (also SCSI and on the same cable) bypassing the
host computer.  I'm aware that I will have to perform all sorts of minor
tricks, ie. prepare a special partition on the disk to allow easily transfer
of contiguous blocks of data as well as getting down and dirty with commands
given to the devices involved.   I'm interested in minimizing delays by
not bothering to store the data in the host system, only to have to write it
out again.  

Thanks for any help, suggestions or psychiatric advice.


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Jerry S. Weiss  |  Northwestern University Medical School
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