ATA queued commands (was Re: ULTRA ATA/100)

From: Mark Hahn (hahn@coffee.psychology.mcmaster.ca)
Date: Wed Jun 07 2000 - 17:33:27 EST


> It seems that "Tagged command queuing" is also mentioned in the
> specifications of newer IBM Desktars at
> http://www.storage.ibm.com/hardsoft/diskdrdl/prod/deskpop.htm

IBM deserves MAJOR credit for the following page:
http://www.storage.ibm.com/hardsoft/diskdrdl/prod/deskpop.htm

all too often, lawyers have made companies anal-retentive about specs.
in the 75GXP doc, I can't find whether it supports a queue depth >0.
for Linux, that's not a big deal: disconnect is the real win, since
that lets us talk to the other disk on the chain. (and Linux already
does a better job of head scheduling with a queue of 256 requests.)

37 MB/s typical sustained bandwidth (>35 as measured by bonnie,
through ext2). basically A Very Nice Disk.

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