Clarify between decimal bytes and binary bytes
Kevin D Butt
kdbutt at us.ibm.com
Wed Jul 7 11:45:35 PDT 2010
Formatted message: <a href="http://www.t10.org/cgi-bin/ac.pl?t=r&f=r1007075_f.htm">HTML-formatted message</a>
Rob,
Thanks. I thought Ralph and I had discussed this in the past, but I
couldn't find it in SPC-4.
Thanks,
Kevin D. Butt
SCSI & Fibre Channel Architect, Tape Firmware
MS 6TYA, 9000 S. Rita Rd., Tucson, AZ 85744
Tel: 520-799-5280
Fax: 520-799-2723 (T/L:321)
Email address: kdbutt at us.ibm.com
http://www-03.ibm.com/servers/storage/
From:
"Elliott, Robert (Server Storage)" <Elliott at hp.com>
To:
Kevin D Butt/Tucson/IBM at IBMUS, "t10 at t10.org" <t10 at t10.org>
Date:
07/07/2010 11:07 AM
Subject:
RE: Clarify between decimal bytes and binary bytes
Bob Snively championed that back in 2000 during SPC-2 letter ballot. The
conflicting units actually don't appear very often in the T10 standards.
See:
* SPC-4 revision 25 section 3.6.4
* SES-3 revision 2 section 7.3.11 table 95
SBC-3 revision 22 has no remaining uses of binary OR decimal prefixes, so
no longer references IEC 60027.
---
Rob Elliott HP ISS Platform Technology - Server Storage
From: owner-t10 at t10.org [mailto:owner-t10 at t10.org] On Behalf Of Kevin D
Butt
Sent: Wednesday, 07 July, 2010 11:37 AM
To: t10 at t10.org
Subject: Clarify between decimal bytes and binary bytes
I believe that the time has come to clear up confusion in the industry
about the units used in T10 standards. There should be a clause added in
each of the standards describing the difference between decimal bytes
(e.g., MB = 10^6) and binary bytes (e.g., MiB = 2^20). There has been
this definition in IEC for since Dec 1998.
References:
http://physics.nist.gov/cuu/Units/binary.html
http://en.wikipedia.org/wiki/Binary_prefix
I hesitate to bring in a solo proposal to modify SSC-4 or even SPC-4 when
this issue should apply to all standards.
Does anybody disagree that T10 should clarify the units being used in our
standards?
What is the preferred manner in which we should proceed to make sure this
clarification is added to each standard?
Thanks,
Kevin D. Butt
SCSI & Fibre Channel Architect, Tape Firmware
MS 6TYA, 9000 S. Rita Rd., Tucson, AZ 85744
Tel: 520-799-5280
Fax: 520-799-2723 (T/L:321)
Email address: kdbutt at us.ibm.com
http://www-03.ibm.com/servers/storage/
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