zfs discuss - May 2010 - Does Opensolaris support thin reclamation?

Support for thin reclamation depends on the SCSI "WRITE SAME" command;
see this draft of a document from T10:

    http://www.t10.org/ftp/t10/document.05/05-270r0.pdf. 

I spent some time searching the source code for support for "WRITE
SAME", but I wasn''t able to find much. I assume that if it was
supported, it would be listed in this header file:
   
http://src.opensolaris.org/source/xref/onnv/onnv-gate/usr/src/uts/common/sys/scsi/generic/commands.h

Does anyone know for certain whether Opensolaris supports thin reclamation on
thinly-provisioned LUNs? If not, is anyone interested in or actively working on
this?

I''m especially interested in ZFS'' support for thin
reclamation, but I would be interested in hearing about support (or lack of) for
UFS and SVM as well.
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Please find this thread for further info about this topic : 

http://www.opensolaris.org/jive/thread.jspa?threadID=120824&start=0&tstart=0

In short, ZFS doesn''t support thin reclamation today, although we have
RFE open to implement it somewhere in the future.

Regards,
sendai
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