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Date:      Sun, 20 May 2018 18:46:47 +0000
From:      bugzilla-noreply@freebsd.org
To:        fs@FreeBSD.org
Subject:   [Bug 228359] rebuild gmirror + ufs + ssd +trim
Message-ID:  <bug-228359-3630-NzlwWmGEgV@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-228359-3630@https.bugs.freebsd.org/bugzilla/>
References:  <bug-228359-3630@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D228359

Warner Losh <imp@FreeBSD.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |imp@FreeBSD.org

--- Comment #2 from Warner Losh <imp@FreeBSD.org> ---
"To answer your question directly, no, there is currently no way to ask UFS=
 to
TRIM unused filesystem blocks. Of course, gmirror has no way to know whethe=
r a
given block is used or not, so the problem cannot be solved there. Creating=
 a
large file and deleting it is probably the only reasonable workaround for n=
ow."

Doesn't fsck_ufs -E do this?

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