Date: Mon, 13 Aug 2012 09:18:38 +0100 From: "Steven Hartland" <killing@multiplay.co.uk> To: "Petri Helenius" <petri@helenius.fi>, <freebsd-fs@freebsd.org> Subject: Re: zero deleted blocks Message-ID: <22BACE55A93F4888AA2B38387FFBF971@multiplay.co.uk> References: <7BDA02A3-99ED-4F67-9B2D-5AAF1523642E@helenius.fi>
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Sounds like you may be talking about delete / trim support?
If so UFS supports BIO_DELETE via -t on newfs or on an existing
FS via tunefs -t enable
ZFS doesn't currently BIO_DELETE but should soon as we've sponsored
a project to add it, just waiting on it being committed. I've
got a patch against 8.3-RELEASE if your interested in testing.
It does require support from the underlying layers. cam ata
supports it but cam da doesn't but again we have a patch for
that if you want to test.
Regards
Steve
----- Original Message -----
From: "Petri Helenius" <petri@helenius.fi>
To: <freebsd-fs@freebsd.org>
Sent: Monday, August 13, 2012 7:01 AM
Subject: zero deleted blocks
Hi,
Is it possible to have ZFS or UFS to zero out the deallocated blocks to facilitate VM disk compaction?
Pete
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