[Bug 204641] 10.2 UNMAP/TRIM not available on a zfs zpool that uses iSCSI disks, backed on a zpool file target

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=204641

Alexander Motin <mav at FreeBSD.org> changed:

           What    |Removed                     |Added
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                 CC|                            |mav at FreeBSD.org
           Assignee|freebsd-bugs at FreeBSD.org    |mav at FreeBSD.org

--- Comment #1 from Alexander Motin <mav at FreeBSD.org> ---
Are your iSCSI LUNs backed by regular files or ZVOLs? I am asking because
FreeBSD simply has no API to punch hole in existing file, that is why UNMAP
simply can not work for file-backend LUNs, and so it is automatically disabled.
CTL supports UNMAP for all other cases: ZVOLs in both device and file modes and
raw devices.

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