Clarify between decimal bytes and binary bytes

Paul Stone Paul.Stone at quantum.com
Wed Jul 7 13:43:37 PDT 2010


Formatted message: <a href="http://www.t10.org/cgi-bin/ac.pl?t=r&f=r100707g_f.htm">HTML-formatted message</a>

SSC-4 uses the terms "megabytes written", "megabytes read", "megabytes
transferred", and "capacity in megabytes" in a number of fields.  These
are all decimal values.
___________________________________
Paul Stone | Firmware Engineer | Quantum Corporation | Office:
949.725.1874 | paul.stone at quantum.com  
________________________________
From: owner-t10 at t10.org [mailto:owner-t10 at t10.org] On Behalf Of Penokie,
George
Sent: Wednesday, July 07, 2010 12:34 PM
To: T10 Reflector
Subject: RE: Clarify between decimal bytes and binary bytes
I agree with Gerry's comment. I also looked in several of the most
common T10 standards (SPL, SPC, SAM, SBC) and there is no instance of
MB, MiB, or the four letters "mega" in any of those standards. So unless
you can show specific instances of its use, I don't see why we have to
deal with something that is not used in our standards.
Bye for now, 
George Penokie 
LSI Corporation 
3033 41st St. NW 
Suite 100 
Rochester, MN 55901 
507-328-9017 
george.penokie at lsi.com 
From: owner-t10 at t10.org [mailto:owner-t10 at t10.org] On Behalf Of Gerry
Houlder
Sent: Wednesday, July 07, 2010 1:44 PM
To: T10 Reflector
Subject: Re: Clarify between decimal bytes and binary bytes
I agree with your description of the use of MB versus MiB, but a quick
search of the most common T10 standards show no instance of the use of
either acronym. I'm not sure we should be specifying use of terms that
are not present in T10 standards, but are used in product data sheets.
SAS-2 does use MBps (for Megabytes per second) and correctly defines it
as a decimal entity.
On Wed, Jul 7, 2010 at 11:37 AM, Kevin D Butt <kdbutt at us.ibm.com> wrote:
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://physics.nist.gov/cuu/Units/binary.html&gt;  
http://en.wikipedia.org/wiki/Binary_prefix
<http://en.wikipedia.org/wiki/Binary_prefix&gt;  
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/
<http://www-03.ibm.com/servers/storage/&gt;  



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