Date: Wed, 14 Dec 2016 10:57:23 +0100 From: Miroslav Lachman <000.fbsd@quip.cz> To: Jan Bramkamp <crest@rlwinm.de>, freebsd-fs@freebsd.org Subject: Re: Re-sparse a file-backed IO device + zfs Message-ID: <58511783.9000702@quip.cz> In-Reply-To: <43b81c7e-8a7b-73f4-0a13-5c91c92663b6@rlwinm.de> References: <fa5f1d106a6b4a21ad408b30e8b14ffa@exch2-4.slu.se> <43b81c7e-8a7b-73f4-0a13-5c91c92663b6@rlwinm.de>
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Jan Bramkamp wrote on 2016/12/13 10:59: > On 13/12/2016 07:54, Karli Sjöberg wrote: >> Wouldn't you have needed TRIM on the disk(s) inside the VM and it >> would have taken care of all this for you? > > The ahci-hd driver supports TRIM on ZFS volumes. Why do you use sparse > file instead of a ZFS volume? I something had not changed you need twice the space of ZVOL to make a snapshot. So in some scenarios it is better to use files instead of ZVOL. Miroslav Lachman
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