[illumos-Discuss] Heads up: iSCSI UNMAP support

[Dan McDonald]

The Illumos gate now has support for the UNMAP operation for iSCSI if the backing store is a ZFS zvol (raw/character device).  If your filesystem supports UNMAP (e.g. -o discrard with Linux EXT4), you'll see space reclamation on the zvol.

Thanks to original author Sumit Gupta (whose original code is in NS3.1), and Eric Schrock and George Wilson who provided ZFS help to this newbie.

Enjoy!
Dan McD.

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