Write Stream IDs?

[Bill Martin-SSI]

* From the T10 Reflector (t10 at t10.org), posted by:
* Bill Martin-SSI <bill.martin at ssi.samsung.com>
*
Howard the document you want is 15-141r0. You can get this document at
http://www.t10.org/cgi-bin/ac.pl?t=d&f=15-141r0.pdf. 
Bill Martin
SSD I/O Standards 
Samsung Semiconductor, Inc. 
Cell (408) 499-1839
-----Original Message-----
From: owner-t10 at t10.org [mailto:owner-t10 at t10.org] On Behalf Of Howard Chu
Sent: Tuesday, May 12, 2015 6:44 AM
To: t10 at t10.org
Subject: Write Stream IDs?
* From the T10 Reflector (t10 at t10.org), posted by:
* Howard Chu <hyc at symas.com>
*
Hi, can someone point me to discussions/drafts for Write Stream IDs? I was
just pointed to this list and haven't found anything relevant in the
Published section of the t10.org web site.
My main interest is in grouping and partially ordering writes, not sure if
Stream IDs helps there. What I'm hoping for:
> Since atomic I/Os have come up recently, I thought I'd throw a 
> wish-list item out there for consideration. It seems to me that the 
> notion of write barriers was too heavy-handed. What I would like is a 
> way to tag groups of writes. The only ordering constraint being, 
> writes within a group tagged N cannot be started before all writes in 
> group N-1 have completed. Aside from that, writes within a group may 
> be freely mixed and reordered with non-tagged/non-grouped writes, and 
> freely reordered within the group. That would allow a DB application 
> to commit its transactions with a consistent ordering without 
> requiring a full cache flush/sync/etc., thus reducing impact on overall
I/O.
(from http://www.spinics.net/lists/linux-fsdevel/msg70047.html )
-- 
   -- Howard Chu
   CTO, Symas Corp.	      http://www.symas.com
   Director, Highland Sun     http://highlandsun.com/hyc/
   Chief Architect, OpenLDAP  http://www.openldap.org/project/
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