From nobody Sun Jul 17 16:42:07 2022 X-Original-To: questions@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 4Lm9vj2svjz4WlQW for ; Sun, 17 Jul 2022 16:45:53 +0000 (UTC) (envelope-from grahamperrin@freebsd.org) Received: from smtp.freebsd.org (smtp.freebsd.org [96.47.72.83]) (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-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "smtp.freebsd.org", Issuer "R3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4Lm9vj2LrHz3tW1 for ; Sun, 17 Jul 2022 16:45:53 +0000 (UTC) (envelope-from grahamperrin@freebsd.org) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1658076353; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=swqI3DHcpbF2EJ4DOgaFdaKLnSXr9/E5PeqP2pmi2LM=; b=W03X2B3PfRhWmQWezJfAcuQkO6Rtk3A92MNiB/HpkKGK0rZfBHzAvEgi3pU/fQz6wuc2lO XYqNG1f9jrmuF742k3npMXP3zaN1vS1wDriU/OIw/lWh/vK6LNSNXcyQ/4fsvQ7KCPR4MW KDpeJadlZmR30YVC48lbuBtV429YQqTjuuqF31ofLDgoghbTxUOX157Vhp89V3r27+txyR fQj3C+2DMyw0hFq9MVr+uY8+g9FG52t6ih8BeBrHMDKRPdgDheU3a/Wfl0wb7fjhXZFUbn uqNNDB/b6WOvl6yLp2kWHm0g8/WUx0/W88tx4wpOrcjXwh56S3OTiXvQyEoqtA== Received: from [IPV6:2001:470:1f1c:a0::2] (tunnel642390-pt.tunnel.tserv1.lon2.ipv6.he.net [IPv6:2001:470:1f1c:a0::2]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) (Authenticated sender: grahamperrin) by smtp.freebsd.org (Postfix) with ESMTPSA id 4Lm9vj03MWzsw4 for ; Sun, 17 Jul 2022 16:45:52 +0000 (UTC) (envelope-from grahamperrin@freebsd.org) Content-Type: multipart/alternative; boundary="------------mT2Cei1nep2al0WjZqjQk0h2" Message-ID: Date: Sun, 17 Jul 2022 17:42:07 +0100 List-Id: User questions List-Archive: https://lists.freebsd.org/archives/freebsd-questions List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-questions@freebsd.org X-BeenThere: freebsd-questions@freebsd.org MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:91.0) Gecko/20100101 Thunderbird/91.11.0 Subject: zroot/ROOT/default, bectl(8) and boot environments (was: rationale for default ZFS datasets) Content-Language: en-GB To: questions@freebsd.org References: From: Graham Perrin Organization: FreeBSD In-Reply-To: ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1658076353; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=swqI3DHcpbF2EJ4DOgaFdaKLnSXr9/E5PeqP2pmi2LM=; b=vce7JcJwBb4TlGerDH3wFXoXukCh5S2NyEgIe2mCC0C9hU0+9AUHOFctkCHYtTdBZ6TeLb Ff6E0DbmNiew1HS9IiZJ3LjXuZ24OoPpShJZBxTHb2NnqlZrihXt++PknzaX/WAhaHBEQm 85AYp6gxBDWMmv46w3FwiMP/oyNLCMoM6Baix0+j4WtjGRfD3D0H/n/9vczT3bV9a0sUbd 36Uz/KFy9UvfHcWfgQmwLd8STZj8CTQ4+HXNse9rqg+pK774F9zbPDOMJUuLe6zkQzT19y CzBD3zlyKq+WGVG1jzWBqZJvkLfLwqN8ekVRfKIo+mntj/RwUG7G+IyC/lxItw== ARC-Seal: i=1; s=dkim; d=freebsd.org; t=1658076353; a=rsa-sha256; cv=none; b=G0qfYcrPRKMqRlwgvCpgIw9kGphzppj6wnqy0QjvGjk4/isoXnyCHAcQJMA9KECmenN4v5 vewnKGup9l7Mq4MNUuZnirWVi4wwe5VgoLV/aa8I7a8vMFhL6or9XdrIXAJpgTijEjgcUY fLOeNnqsKZAZRLL5ruKCIeuDRKq4anU1nCJfIXGns3mCSO+dqg90UAU74t6K+f2v8aS2mJ ovo7B901D8XgO9HRV4XOxtc+zFZe26w9/5tKyIR81lfMcbxzIinyTT2hq59b++aZmF5WJ6 LsBbi7wW7mLAzjB56CB5pI0O0RMG9Rr5H4/WkqgHs7qoKd+fUtQcY3uCqFzHVw== ARC-Authentication-Results: i=1; mx1.freebsd.org; none X-ThisMailContainsUnwantedMimeParts: N This is a multi-part message in MIME format. --------------mT2Cei1nep2al0WjZqjQk0h2 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit On 17/07/2022 17:28, Taceant Omnes wrote: > … what is the purpose of zroot/ROOT/default? … > root@fbsd-vm:~ # zfs list > NAME USED AVAIL REFER MOUNTPOINT > zroot 4.38G 32.0G 96K /zroot > zroot/ROOT 3.40G 32.0G 96K none > zroot/ROOT/default 3.40G 32.0G 3.40G / > zroot/tmp 1001M 32.0G 1001M /tmp > zroot/usr 508K 32.0G 96K /usr > zroot/usr/home 220K 32.0G 148K /usr/home > zroot/usr/ports 96K 32.0G 96K /usr/ports > zroot/usr/src 96K 32.0G 96K /usr/src > zroot/var 1.02M 32.0G 96K /var > zroot/var/audit 96K 32.0G 96K /var/audit > zroot/var/crash 96K 32.0G 96K /var/crash > zroot/var/log 540K 32.0G 540K /var/log > zroot/var/mail 124K 32.0G 124K /var/mail > zroot/var/tmp 96K 32.0G 96K /var/tmp Consider the output from two commands: zpool get bootfs zroot zfs get mountpoint zroot/ROOT/default If you find that the mountpoint is none, you might wonder about / in your listing above. This part of the magic of ZFS boot environments. ------------------------------------------------------------------------ Here, for example: % zpool get bootfs august NAME    PROPERTY  VALUE                              SOURCE august  bootfs    august/ROOT/n256570-5c19fabbe34-e  local % zfs get mountpoint august/ROOT/n256570-5c19fabbe34-e NAME                               PROPERTY    VALUE       SOURCE august/ROOT/n256570-5c19fabbe34-e  mountpoint  none        inherited from august % bectl list -c creation BE                        Active Mountpoint Space Created n250511-5f73b3338ee-d     -      -          64.6G 2021-11-13 15:43 n253776-d5ad1713cc3-b     -      -          9.43G 2022-03-18 09:31 n254693-d7696096209-f     -      -          4.60G 2022-04-27 17:41 n255078-e140d551b78-h     -      -          88.4G 2022-05-11 21:18 n255588-01235012e5b-d     -      -          2.61G 2022-05-15 00:29 n255588-01235012e5b-b-c1d -      -          14.0G 2022-05-23 18:11 n255769-f16e38162c7-k     -      -          6.48G 2022-06-14 20:36 n256147-1c665e95d44-d     -      -          6.35G 2022-06-25 08:08 n256363-9c42645a1e4-d     -      -          3.32G 2022-07-05 19:40 n256570-5c19fabbe34-c     -      -          3.66M 2022-07-13 10:53 n256570-5c19fabbe34-d     -      -          80.8M 2022-07-16 08:00 n256570-5c19fabbe34-e     NR     /          61.9G 2022-07-17 12:09 % See bectl(8) --------------mT2Cei1nep2al0WjZqjQk0h2 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 8bit
On 17/07/2022 17:28, Taceant Omnes wrote:
… what is the purpose of zroot/ROOT/default? …

root@fbsd-vm:~ # zfs list
NAME                 USED  AVAIL     REFER  MOUNTPOINT
zroot               4.38G  32.0G       96K  /zroot
zroot/ROOT          3.40G  32.0G       96K  none
zroot/ROOT/default  3.40G  32.0G     3.40G  /
zroot/tmp           1001M  32.0G     1001M  /tmp
zroot/usr            508K  32.0G       96K  /usr
zroot/usr/home       220K  32.0G      148K  /usr/home
zroot/usr/ports       96K  32.0G       96K  /usr/ports
zroot/usr/src         96K  32.0G       96K  /usr/src
zroot/var           1.02M  32.0G       96K  /var
zroot/var/audit       96K  32.0G       96K  /var/audit
zroot/var/crash       96K  32.0G       96K  /var/crash
zroot/var/log        540K  32.0G      540K  /var/log
zroot/var/mail       124K  32.0G      124K  /var/mail
zroot/var/tmp         96K  32.0G       96K  /var/tmp

Consider the output from two commands:

zpool get bootfs zroot

zfs get mountpoint zroot/ROOT/default

If you find that the mountpoint is none, you might wonder about / in your listing above. This part of the magic of ZFS boot environments.

Here, for example:

% zpool get bootfs august
NAME    PROPERTY  VALUE                              SOURCE
august  bootfs    august/ROOT/n256570-5c19fabbe34-e  local
% zfs get mountpoint august/ROOT/n256570-5c19fabbe34-e
NAME                               PROPERTY    VALUE       SOURCE
august/ROOT/n256570-5c19fabbe34-e  mountpoint  none        inherited from august
% bectl list -c creation
BE                        Active Mountpoint Space Created
n250511-5f73b3338ee-d     -      -          64.6G 2021-11-13 15:43
n253776-d5ad1713cc3-b     -      -          9.43G 2022-03-18 09:31
n254693-d7696096209-f     -      -          4.60G 2022-04-27 17:41
n255078-e140d551b78-h     -      -          88.4G 2022-05-11 21:18
n255588-01235012e5b-d     -      -          2.61G 2022-05-15 00:29
n255588-01235012e5b-b-c1d -      -          14.0G 2022-05-23 18:11
n255769-f16e38162c7-k     -      -          6.48G 2022-06-14 20:36
n256147-1c665e95d44-d     -      -          6.35G 2022-06-25 08:08
n256363-9c42645a1e4-d     -      -          3.32G 2022-07-05 19:40
n256570-5c19fabbe34-c     -      -          3.66M 2022-07-13 10:53
n256570-5c19fabbe34-d     -      -          80.8M 2022-07-16 08:00
n256570-5c19fabbe34-e     NR     /          61.9G 2022-07-17 12:09
%

See bectl(8)

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