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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