From owner-freebsd-virtualization@freebsd.org Wed Jul 15 14:21:12 2020 Return-Path: Delivered-To: freebsd-virtualization@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id CEFBD36774F for ; Wed, 15 Jul 2020 14:21:12 +0000 (UTC) (envelope-from allanjude@freebsd.org) Received: from tor1-11.mx.scaleengine.net (tor1-11.mx.scaleengine.net [209.51.186.6]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 4B6KLb62dKz3gq7 for ; Wed, 15 Jul 2020 14:21:11 +0000 (UTC) (envelope-from allanjude@freebsd.org) Received: from [10.1.1.2] (Seawolf.HML3.ScaleEngine.net [209.51.186.28]) (Authenticated sender: allanjude.freebsd@scaleengine.com) by tor1-11.mx.scaleengine.net (Postfix) with ESMTPSA id 3237E264AB for ; Wed, 15 Jul 2020 14:21:10 +0000 (UTC) DKIM-Filter: OpenDKIM Filter v2.10.3 tor1-11.mx.scaleengine.net 3237E264AB Subject: Re: zfs compression of a volume To: freebsd-virtualization@freebsd.org References: <20200715140444.GA72748@bastion.zyxst.net> From: Allan Jude Autocrypt: addr=allanjude@freebsd.org; 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WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20200715140444.GA72748@bastion.zyxst.net> Content-Type: text/plain; charset=windows-1252 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 4B6KLb62dKz3gq7 X-Spamd-Bar: / Authentication-Results: mx1.freebsd.org; none X-Spamd-Result: default: False [0.00 / 15.00]; ASN(0.00)[asn:6939, ipnet:209.51.160.0/19, country:US]; local_wl_from(0.00)[freebsd.org] X-BeenThere: freebsd-virtualization@freebsd.org X-Mailman-Version: 2.1.33 Precedence: list List-Id: "Discussion of various virtualization techniques FreeBSD supports." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 15 Jul 2020 14:21:13 -0000 On 2020-07-15 10:04, tech-lists wrote: > Hi, > > If a zfs-backed bhyve instance is created, and compression is not set, > if the > instance is turned off, then compression set on the host for the volume > (and > then the bhyve instance is started), is the instance compressed in its > entirety at that time, or just data subsequently added to it? > > thanks, When you change the compression setting on any ZFS dataset (filesystem or volume), it only applies to blocks that are written (or overwritten) after that point. You do not need to stop the bhyve to change the compression setting. If you want to recompress the entire volume: 1) stop the bhyve 2) snapshot the volume 3) create a new volume, with compression enabled 4) zfs send -e oldvolume@snapshot | zfs recv -F newvolume 5) start the bhyve using the new volume 6) (optional) destroy the old volume -- Allan Jude