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Date:      Fri, 30 Nov 2018 00:13:33 +0700
From:      Eugene Grosbein <eugen@freebsd.org>
To:        John Nielsen <lists@jnielsen.net>
Cc:        src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org
Subject:   Re: svn commit: r341232 - in head/usr.bin: . trim
Message-ID:  <39f2c6b4-1d84-1324-217d-12dd5c2573b8@freebsd.org>
In-Reply-To: <9812F670-DD3D-4A56-A826-28B4A055F488@jnielsen.net>
References:  <201811291421.wATELQbx059318@repo.freebsd.org> <9812F670-DD3D-4A56-A826-28B4A055F488@jnielsen.net>

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29.11.2018 23:45, John Nielsen wrote:

> I’m curious, would this also be useful for virtual disks or SAN/NAS devices backed by thinly-provisioned storage?

It won't work for for files residing on UFS/ZFS, if you mean that.

And you can verify that easily: just make extra file and try to trim it
to see "Inappropriate ioctl for device" error.

It might work for iSCSI attached devices, I'm not sure.



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