zero deleted blocks

[Steven Hartland]

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 at helenius.fi>
To: <freebsd-fs at 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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