[OGSA-D-WG] ***SPAM*** Definition of data consistency

[Allen Luniewski]

Dave,

I think that I am okay with that suggested change.  I am a little bit
worried about using the word "measure" as it can be taken to imply things
that we really do not want to address (e.g., a means to measure and a
quantifiable scale for measurement).  I thought about suggesting changing
"A measure" to "An indication" but that seems just a bit too vague to me.
I don't have a better suggestion right now.

Allen Luniewski
IBM Cross Brand Services
IBM Silicon Valley Laboratory
555 Bailey Ave.
San Jose, CA 95141

408-463-2255
408-930-1844 (mobile)



                                                                           
             "Dave Berry"                                                  
             <daveb at nesc.ac.uk                                             
             >                                                          To 
             Sent by:                  <ogsa-d-wg at ogf.org>                 
             ogsa-d-wg-bounces                                          cc 
             @ogf.org                  "Treadwell, Jem"                    
                                       <jem.treadwell at hp.com>              
                                                                   Subject 
             10/08/2007 02:11          [OGSA-D-WG] ***SPAM***  Definition  
             PM                        of data consistency                 
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           




Jem queried our definition of data consistency, which is currently:

|-------------------------------------------------------------------------|
|A policy that specifies or describes how up-to-date an instance of data  |
|is in one service of a distributed system, with respect to one or more   |
|instances of that data elsewhere in the system.                          |
|-------------------------------------------------------------------------|




Jem said (in e-mail):



my thought was that data consistency would be a state of the data - it's
consistent w.r.t. some other set of data or it isn't; the policy would be
the rules that determine whether it is, and what the requirements are.


I've had a look through our document and I agree.  We refer to data
consistency policies but also to data consistency requirements, mechanisms
and strategies.

So, how about this as a revised definntion:

"A measure of how up-to-date an instance of data is in one service of a
distributed system, with respect to one or more instances of that data
elsewhere in the system."


Best wishes,

Dave Berry
Deputy Director, Research & E-infrastructure Development
National e-Science Centre
15 South College Street, Edinburgh, EH8 9AA
+44 131 651 4039           www.nesc.ac.uk
 --
  ogsa-d-wg mailing list
  ogsa-d-wg at ogf.org
  http://www.ogf.org/mailman/listinfo/ogsa-d-wg
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://www.ogf.org/pipermail/ogsa-d-wg/attachments/20071008/9e67e59c/attachment.html 
-------------- next part --------------
A non-text attachment was scrubbed...
Name: graycol.gif
Type: image/gif
Size: 105 bytes
Desc: not available
Url : http://www.ogf.org/pipermail/ogsa-d-wg/attachments/20071008/9e67e59c/attachment.gif 
-------------- next part --------------
A non-text attachment was scrubbed...
Name: pic20800.gif
Type: image/gif
Size: 1255 bytes
Desc: not available
Url : http://www.ogf.org/pipermail/ogsa-d-wg/attachments/20071008/9e67e59c/attachment-0001.gif 
-------------- next part --------------
A non-text attachment was scrubbed...
Name: ecblank.gif
Type: image/gif
Size: 45 bytes
Desc: not available
Url : http://www.ogf.org/pipermail/ogsa-d-wg/attachments/20071008/9e67e59c/attachment-0002.gif