From nobody Thu Oct 27 13:29:21 2022 X-Original-To: freebsd-fs@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 4Mymkf3cxfz4g2p6 for ; Thu, 27 Oct 2022 13:30:02 +0000 (UTC) (envelope-from karl@denninger.net) Received: from colo1.denninger.net (colo1.denninger.net [104.236.120.189]) (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 4Mymkd2HXgz3KCK for ; Thu, 27 Oct 2022 13:30:01 +0000 (UTC) (envelope-from karl@denninger.net) Received: from denninger.net (097-081-026-048.res.spectrum.com [97.81.26.48]) by colo1.denninger.net (Postfix) with ESMTP id C53352110B5 for ; Thu, 27 Oct 2022 09:29:24 -0400 (EDT) Received: from [192.168.10.25] (D15.Denninger.Net [192.168.10.25]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by denninger.net (Postfix) with ESMTPSA id 671E72A9280 for ; Thu, 27 Oct 2022 09:29:24 -0400 (EDT) Message-ID: <5391a765-a526-fb19-2f24-bd9067d2f125@denninger.net> Date: Thu, 27 Oct 2022 09:29:21 -0400 List-Id: Filesystems List-Archive: https://lists.freebsd.org/archives/freebsd-fs List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-fs@freebsd.org MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:102.0) Gecko/20100101 Thunderbird/102.4.0 Subject: Re: Does OpenZFS support taking snapshots of the entire operating system? Content-Language: en-US To: freebsd-fs@freebsd.org References: From: Karl Denninger In-Reply-To: Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-512; boundary="------------ms090807010207010804050601" X-Rspamd-Queue-Id: 4Mymkd2HXgz3KCK X-Spamd-Bar: ---- Authentication-Results: mx1.freebsd.org; dkim=none; dmarc=pass (policy=none) header.from=denninger.net; spf=pass (mx1.freebsd.org: domain of karl@denninger.net designates 104.236.120.189 as permitted sender) smtp.mailfrom=karl@denninger.net X-Spamd-Result: default: False [-4.90 / 15.00]; SIGNED_SMIME(-2.00)[]; SUBJECT_ENDS_QUESTION(1.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_MEDIUM(-1.00)[-1.000]; NEURAL_HAM_SHORT(-1.00)[-1.000]; DMARC_POLICY_ALLOW(-0.50)[denninger.net,none]; R_SPF_ALLOW(-0.20)[+mx]; MIME_GOOD(-0.20)[multipart/signed,multipart/alternative,text/plain]; FROM_EQ_ENVFROM(0.00)[]; ASN(0.00)[asn:14061, ipnet:104.236.64.0/18, country:US]; MIME_TRACE(0.00)[0:+,1:+,2:+,3:~,4:~]; MLMMJ_DEST(0.00)[freebsd-fs@freebsd.org]; R_DKIM_NA(0.00)[]; ARC_NA(0.00)[]; RCVD_TLS_LAST(0.00)[]; RCVD_COUNT_THREE(0.00)[3]; RCPT_COUNT_ONE(0.00)[1]; FREEFALL_USER(0.00)[karl]; RCVD_VIA_SMTP_AUTH(0.00)[]; TO_DN_NONE(0.00)[]; FROM_HAS_DN(0.00)[]; HAS_ATTACHMENT(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; PREVIOUSLY_DELIVERED(0.00)[freebsd-fs@freebsd.org]; MID_RHS_MATCH_FROM(0.00)[] X-ThisMailContainsUnwantedMimeParts: N This is a cryptographically signed message in MIME format. --------------ms090807010207010804050601 Content-Type: multipart/alternative; boundary="------------MjRFIkfueLjNyM8VTHUzpAnt" --------------MjRFIkfueLjNyM8VTHUzpAnt Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit You can snapshot a running root filesystem if it is ZFS; that has always been true of ZFS. If the "entire operating system" spans more than one filesystem or pool, however, you cannot get an atomic snapshot across them. Thus if you want that capacity (e.g. an atomic snapshot that is an "instant in time") the "entire operating system" must be contained in one ZFS filesystem. On 10/27/2022 09:26, Turritopsis Dohrnii Teo En Ming wrote: > Subject: Does OpenZFS support taking snapshots of the entire operating > system? > > Good day from Singapore, > > Does OpenZFS support taking snapshots of the entire operating system? > > -- Karl Denninger karl@denninger.net /The Market Ticker/ /[S/MIME encrypted email preferred]/ --------------MjRFIkfueLjNyM8VTHUzpAnt Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 8bit

You can snapshot a running root filesystem if it is ZFS; that has always been true of ZFS.

If the "entire operating system" spans more than one filesystem or pool, however, you cannot get an atomic snapshot across them.  Thus if you want that capacity (e.g. an atomic snapshot that is an "instant in time") the "entire operating system" must be contained in one ZFS filesystem.

On 10/27/2022 09:26, Turritopsis Dohrnii Teo En Ming wrote:
Subject: Does OpenZFS support taking snapshots of the entire operating system?

Good day from Singapore,

Does OpenZFS support taking snapshots of the entire operating system?


--
Karl Denninger
karl@denninger.net
The Market Ticker
[S/MIME encrypted email preferred]
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