Date: Sun, 17 Jul 2022 17:42:07 +0100 From: Graham Perrin <grahamperrin@freebsd.org> To: questions@freebsd.org Subject: zroot/ROOT/default, bectl(8) and boot environments (was: rationale for default ZFS datasets) Message-ID: <f771afba-2a43-d048-f9bc-d98de0e2000a@freebsd.org> In-Reply-To: <CAKkGsYJKu9V6eveNSgs6783hz7dFnPGnh5C9cWnFqqJCgRzeDA@mail.gmail.com> References: <CAKkGsYJKu9V6eveNSgs6783hz7dFnPGnh5C9cWnFqqJCgRzeDA@mail.gmail.com>
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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) <https://www.freebsd.org/cgi/man.cgi?query=bectl&sektion=8&manpath=FreeBSD>; --------------mT2Cei1nep2al0WjZqjQk0h2 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 8bit <html data-lt-installed="true"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> </head> <body> <div class="moz-cite-prefix">On 17/07/2022 17:28, Taceant Omnes wrote:<br> </div> <blockquote type="cite" cite="mid:CAKkGsYJKu9V6eveNSgs6783hz7dFnPGnh5C9cWnFqqJCgRzeDA@mail.gmail.com"> <pre class="moz-quote-pre" wrap="">… what is the purpose of zroot/ROOT/default? …</pre> </blockquote> <br> <blockquote type="cite" cite="mid:CAKkGsYJKu9V6eveNSgs6783hz7dFnPGnh5C9cWnFqqJCgRzeDA@mail.gmail.com"> <pre class="moz-quote-pre" wrap="">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 </pre> </blockquote> <p>Consider the output from two commands: <br> </p> <p><font face="monospace">zpool get bootfs zroot</font></p> <p><font face="monospace">zfs get mountpoint zroot/ROOT/default</font></p> <p>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. <br> </p> <hr width="100%" size="2"> <p>Here, for example: <br> </p> <p><span style="font-family:monospace"><span style="color:#000000;background-color:#ffffff;">% zpool get bootfs august </span><br> NAME PROPERTY VALUE SOURCE <br> august bootfs august/ROOT/n256570-5c19fabbe34-e local <br> % zfs get mountpoint august/ROOT/n256570-5c19fabbe34-e <br> NAME PROPERTY VALUE SOURCE <br> august/ROOT/n256570-5c19fabbe34-e mountpoint none inherited from august <br> % bectl list -c creation <br> BE Active Mountpoint Space Created <br> n250511-5f73b3338ee-d - - 64.6G 2021-11-13 15:43 <br> n253776-d5ad1713cc3-b - - 9.43G 2022-03-18 09:31 <br> n254693-d7696096209-f - - 4.60G 2022-04-27 17:41 <br> n255078-e140d551b78-h - - 88.4G 2022-05-11 21:18 <br> n255588-01235012e5b-d - - 2.61G 2022-05-15 00:29 <br> n255588-01235012e5b-b-c1d - - 14.0G 2022-05-23 18:11 <br> n255769-f16e38162c7-k - - 6.48G 2022-06-14 20:36 <br> n256147-1c665e95d44-d - - 6.35G 2022-06-25 08:08 <br> n256363-9c42645a1e4-d - - 3.32G 2022-07-05 19:40 <br> n256570-5c19fabbe34-c - - 3.66M 2022-07-13 10:53 <br> n256570-5c19fabbe34-d - - 80.8M 2022-07-16 08:00 <br> n256570-5c19fabbe34-e NR / 61.9G 2022-07-17 12:09 <br> % <br> <br> </span>See <a moz-do-not-send="true" href="https://www.freebsd.org/cgi/man.cgi?query=bectl&sektion=8&manpath=FreeBSD">bectl(8)</a></p>; </body> <lt-container></lt-container> </html> --------------mT2Cei1nep2al0WjZqjQk0h2--
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