Enable UNMAP in ZFS

[Steven Hartland]

As others have said ZFS TRIM support, which can be backed by SATA TRIM or SCSI UNMAP, is supported in head. 

All these require driver support for the underlying card, which currently means either CAM ata or scsi supported controllers.

I do plan to MFC ZFS TRIM to stable but it could be a few weeks before I get to it.

I also have a fairly extensive patch for cam which improves cam trim, unmap support if you want to test it.

    Regards
    Steve
----- Original Message ----- 
From: "Dani" <dppascual at gmail.com>
To: <freebsd-fs at freebsd.org>
Sent: Friday, January 18, 2013 1:07 PM
Subject: Enable UNMAP in ZFS


> Hi all,
> 
> I have installed FreeBSD 9.1 and have created a ZFS pool with SAS disks.
> How can I enable UNMAP on SSDs devices used as cache and log devices?
> 
> Thanks you. Regards.
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