SCSI-3 Conundrum (SPC)

Charles Monia Monia at mail.dec.com
Mon Jun 2 10:52:11 PDT 1997


* From the SCSI Reflector (scsi at symbios.com), posted by:
* Charles Monia <Monia at mail.dec.com>
*

Hi Gene:

I have been told that the SPC acronym in SCSI-2 only applied to floppy =
drives.  Given that rather limited usage, we (Digital) support changing =
the SPC acronym to SPPC as you suggest in alternative (b) below.

Charles
-----------

From:	US8RMC::"Gene_Milligan at notes.seagate.com" "Gene Milligan"  =
2-JUN-1997 11:53:50.74
To:	scsi <scsi at symbios.com>
CC:=09
Subj:	SCSI-3 Conundrum

* From the SCSI Reflector (scsi at symbios.com), posted by:
* Gene Milligan <Gene_Milligan at notes.seagate.com>
*
In the process of dealing with the ANSI pre-edits for SBC I have noticed =
that=20
SPC is an acronym for two different items in SCSI-3.

The original meaning of SPC is found in SCSI-2 and SBC which is "The =
step pulse=20
per cylinder (SPC) field is used to specify the number of additional =
step=20
pulses required per cylinder." For those not as familiar with SCSI as =
the=20
members of the committee it will be confusing to have two different =
meanings=20
for SPC (especially with the small caps distinction lost in ASCII =
excerpts as=20
it is in this Email).

The additional new meaning which is found in SCSI-3 including SBC is =
"SCSI-3=20
Primary Commands".

It seems to me there are two obvious alternatives to this conundrum:

 a) Rename NCITS 301-199X (e.g. SCSI-3 Overhead Commands (SOC)) and =
change=20
references to it accordingly.

 b) Change the acronym of step pules per cylinder to (SPPC).

Certainly the correct thing to do to not injure the original =
implementors is=20
choice (a). However since the injury would be infinitesimal and not =
noticed, I=20
suggest being cavalier and taking choice (b).

Although T10 has already approved whatever I do in Rev 8a, I would like =
to know  if there is any objection to changing the acronym of  step =
pules per cylinder  to (SPPC)?

Gene Milligan
Technical Editor of SBC
*
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% Date:  2 Jun 97 10:09:49=20
% Subject: SCSI-3 Conundrum
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