Just an update : Finally I found some technical details about this Thin Reclamation API :
(http://blogs.hds.com/claus/2009/12/i-love-it-when-a-plan-comes-together.html) "This week, (December 7th), Symantec announced their “completing the thin provisioning ecosystem” that includes the necessary API calls for the file system to “notify” the storage array when space is “deleted”. The interface is a previously disused and now revised/reused/repurposed SCSI command (called Write Same) which was jointly worked out with Symantec, Hitachi, and 3PAR. This command allows the file systems (in this case Veritas VxFS) to notify the storage systems that space is no longer occupied. How cool is that! There is also a subcommittee to INCITS T10 studying the standardization is this and SNIA is also studying this. It won’t be long before most file systems, databases, and storage vendors adopt this technology." So it's based on the SCSI Write Same/UNMAP command, (and if I understand correctly SATA TRIM is similar to this from the FS point of view) which standard is not ratified yet. Also, happy new year to everyone! Regards, sendai -- This message posted from opensolaris.org _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
