Date: Thu, 10 Sep 2020 17:08:26 +0200 From: Ludovit Koren <ludovit.koren@gmail.com> To: Christoph Brinkhaus <c.brinkhaus@t-online.de>, freebsd-questions@freebsd.org Subject: Re: ZFS snapshot - rollback problem Message-ID: <CADZBGL4qz7RcLdjAoQSFYxaV53vfa0tb15xZ4WXcTK76hKUPVA@mail.gmail.com> In-Reply-To: <20200910143458.GA83264@esprimo> References: <CADZBGL4C83JyMqHNP5A_aUV%2BddXxbd2F7RtCQhox4dCKKQAqLw@mail.gmail.com> <20200910143458.GA83264@esprimo>
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On Thursday, September 10, 2020, Christoph Brinkhaus < c.brinkhaus@t-online.de> wrote: > On Thu, Sep 10, 2020 at 04:18:39PM +0200, Ludovit Koren wrote: > > Hi, > > > > I have the following configuration: > > > > ~>uname -a > > FreeBSD XxX 11.3-STABLE FreeBSD 11.3-STABLE #1 r354607: Mon Nov 11 > > 12:19:28 CET 2019 root@jedi:/usr/obj/usr/src/sys/HP amd64 > > ~>zfs list > > NAME USED AVAIL REFER MOUNTPOINT > > zroot 244G 0 10.7G /mnt > > zroot/Centos8 6.80G 4.13G 2.67G - > > zroot/msw7 44.9G 25.8G 19.1G - > > zroot/swapdisk0 40.8G 20.6G 20.2G - > > zroot/usr 131G 0 50.9G /usr > > zroot/usr/home 80.1G 0 80.1G /usr/home > > zroot/var 9.94G 0 9.94G /var > > > > After zfs snapshot, which I did on the root, I got: > > ~>zfs list -t snapshot > > NAME USED AVAIL REFER MOUNTPOINT > > zroot@200909 1K - 10.7G - > > zroot/Centos8@200909 1K - 2.67G - > > zroot/msw7@200909 1K - 19.1G - > > zroot/swapdisk0@200909 0 - 20.2G - > > zroot/usr@200909 1K - 50.9G - > > zroot/usr/home@200909 1K - 80.1G - > > zroot/var@200909 1K - 9.94G - > > > > i.e. whole filesystem is read only. I am not able to do neither > > rollback, nor destroy of the snapshot. Is there any possibility to > > reset the filesystem to the read-write mode? > > I do not see there if it is read only or not. > To change the readyonly property: > zfs set readonly=off > > Mount to make it effective: > zfs mount -a > > > > Any help is greatly appreciated. > I hope my notes are correct and help you. > > If it would be so easy... The problem is the snapshot is over the zfs root file system. And on the snapshot I cannot change the property. Here are options: ~>zfs get all NAME PROPERTY VALUE SOURCE zroot type filesystem - zroot creation Mon May 27 23:30 2013 - zroot used 244G - zroot available 0 - zroot referenced 10.7G - zroot compressratio 1.00x - zroot mounted yes - zroot quota none default zroot reservation none default zroot recordsize 128K default zroot mountpoint /mnt local zroot sharenfs off default zroot checksum fletcher4 local zroot compression off default zroot atime on default zroot devices on default zroot exec on default zroot setuid on default zroot readonly off local zroot jailed off default zroot snapdir hidden default zroot aclmode discard default zroot aclinherit restricted default zroot createtxg 1 - zroot canmount on default zroot xattr off temporary zroot copies 1 default zroot version 5 - zroot utf8only off - zroot normalization none - zroot casesensitivity sensitive - zroot vscan off default zroot nbmand off default zroot sharesmb off default zroot refquota none default zroot refreservation none default zroot guid 15663691137267636586 - zroot primarycache all default zroot secondarycache all default zroot usedbysnapshots 1K - zroot usedbydataset 10.7G - zroot usedbychildren 234G - zroot usedbyrefreservation 0 - zroot logbias latency default zroot dedup off default zroot mlslabel - zroot sync standard default zroot refcompressratio 1.00x - zroot written 1K - zroot logicalused 193G - zroot logicalreferenced 10.7G - zroot volmode default default zroot filesystem_limit none default zroot snapshot_limit none default zroot filesystem_count none default zroot snapshot_count none default zroot redundant_metadata all default zroot@200909 type snapshot - zroot@200909 creation Wed Sep 9 11:12 2020 - zroot@200909 used 1K - zroot@200909 referenced 10.7G - zroot@200909 compressratio 1.00x - zroot@200909 devices on default zroot@200909 exec on default zroot@200909 setuid on default zroot@200909 createtxg 20490195 - zroot@200909 xattr on default zroot@200909 version 5 - zroot@200909 utf8only off - zroot@200909 normalization none - zroot@200909 casesensitivity sensitive - zroot@200909 nbmand off default zroot@200909 guid 2206615480070071196 - zroot@200909 primarycache all default zroot@200909 secondarycache all default zroot@200909 defer_destroy off - zroot@200909 userrefs 0 - zroot@200909 mlslabel - zroot@200909 refcompressratio 1.00x - zroot@200909 written 10.7G - zroot@200909 clones - zroot@200909 logicalreferenced 10.7G - zroot@200909 volmode default default zroot/Centos8 type volume - zroot/Centos8 creation Thu Oct 31 14:12 2019 - zroot/Centos8 used 6.80G - zroot/Centos8 available 4.13G - zroot/Centos8 referenced 2.67G - zroot/Centos8 compressratio 1.00x - zroot/Centos8 reservation none default zroot/Centos8 volsize 4G local zroot/Centos8 volblocksize 8K default zroot/Centos8 checksum fletcher4 inherited from zroot zroot/Centos8 compression off default zroot/Centos8 readonly off inherited from zroot zroot/Centos8 createtxg 16467672 - zroot/Centos8 copies 1 default zroot/Centos8 refreservation 4.13G local zroot/Centos8 guid 5814621169889103161 - zroot/Centos8 primarycache all default zroot/Centos8 secondarycache all default zroot/Centos8 usedbysnapshots 1K - zroot/Centos8 usedbydataset 2.67G - zroot/Centos8 usedbychildren 0 - zroot/Centos8 usedbyrefreservation 4.13G - zroot/Centos8 logbias latency default zroot/Centos8 dedup off default zroot/Centos8 mlslabel - zroot/Centos8 sync standard default zroot/Centos8 refcompressratio 1.00x - zroot/Centos8 written 1K - zroot/Centos8 logicalused 2.66G - zroot/Centos8 logicalreferenced 2.66G - zroot/Centos8 volmode dev local zroot/Centos8 snapshot_limit none default zroot/Centos8 snapshot_count none default zroot/Centos8 redundant_metadata all default zroot/Centos8@200909 type snapshot - zroot/Centos8@200909 creation Wed Sep 9 11:12 2020 - zroot/Centos8@200909 used 1K - zroot/Centos8@200909 referenced 2.67G - zroot/Centos8@200909 compressratio 1.00x - zroot/Centos8@200909 devices on default zroot/Centos8@200909 exec on default zroot/Centos8@200909 setuid on default zroot/Centos8@200909 createtxg 20490195 - zroot/Centos8@200909 xattr on default zroot/Centos8@200909 nbmand off default zroot/Centos8@200909 guid 10823844225552088614 - zroot/Centos8@200909 primarycache all default zroot/Centos8@200909 secondarycache all default zroot/Centos8@200909 defer_destroy off - zroot/Centos8@200909 userrefs 0 - zroot/Centos8@200909 mlslabel - zroot/Centos8@200909 refcompressratio 1.00x - zroot/Centos8@200909 written 2.67G - zroot/Centos8@200909 clones - zroot/Centos8@200909 logicalreferenced 2.66G - zroot/Centos8@200909 volmode dev inherited from zroot/Centos8 zroot/msw7 type volume - zroot/msw7 creation Thu Feb 22 15:19 2018 - zroot/msw7 used 44.9G - zroot/msw7 available 25.8G - zroot/msw7 referenced 19.1G - zroot/msw7 compressratio 1.00x - zroot/msw7 reservation none default zroot/msw7 volsize 25G local zroot/msw7 volblocksize 8K default zroot/msw7 checksum fletcher4 inherited from zroot zroot/msw7 compression off default zroot/msw7 readonly off inherited from zroot zroot/msw7 createtxg 10775012 - zroot/msw7 copies 1 default zroot/msw7 refreservation 25.8G local zroot/msw7 guid 16581387537923661645 - zroot/msw7 primarycache all default zroot/msw7 secondarycache all default zroot/msw7 usedbysnapshots 1K - zroot/msw7 usedbydataset 19.1G - zroot/msw7 usedbychildren 0 - zroot/msw7 usedbyrefreservation 25.8G - zroot/msw7 logbias latency default zroot/msw7 dedup off default zroot/msw7 mlslabel - zroot/msw7 sync standard default zroot/msw7 refcompressratio 1.00x - zroot/msw7 written 1K - zroot/msw7 logicalused 19.0G - zroot/msw7 logicalreferenced 19.0G - zroot/msw7 volmode dev local zroot/msw7 snapshot_limit none default zroot/msw7 snapshot_count none default zroot/msw7 redundant_metadata all default zroot/msw7@200909 type snapshot - zroot/msw7@200909 creation Wed Sep 9 11:12 2020 - zroot/msw7@200909 used 1K - zroot/msw7@200909 referenced 19.1G - zroot/msw7@200909 compressratio 1.00x - zroot/msw7@200909 devices on default zroot/msw7@200909 exec on default zroot/msw7@200909 setuid on default zroot/msw7@200909 createtxg 20490195 - zroot/msw7@200909 xattr on default zroot/msw7@200909 nbmand off default zroot/msw7@200909 guid 3899706450355491715 - zroot/msw7@200909 primarycache all default zroot/msw7@200909 secondarycache all default zroot/msw7@200909 defer_destroy off - zroot/msw7@200909 userrefs 0 - zroot/msw7@200909 mlslabel - zroot/msw7@200909 refcompressratio 1.00x - zroot/msw7@200909 written 19.1G - zroot/msw7@200909 clones - zroot/msw7@200909 logicalreferenced 19.0G - zroot/msw7@200909 volmode dev inherited from zroot/msw7 zroot/swapdisk0 type volume - zroot/swapdisk0 creation Mon Feb 13 11:03 2017 - zroot/swapdisk0 used 40.8G - zroot/swapdisk0 available 20.6G - zroot/swapdisk0 referenced 20.2G - zroot/swapdisk0 compressratio 1.00x - zroot/swapdisk0 reservation none default zroot/swapdisk0 volsize 20G local zroot/swapdisk0 volblocksize 8K default zroot/swapdisk0 checksum fletcher4 inherited from zroot zroot/swapdisk0 compression off default zroot/swapdisk0 readonly off inherited from zroot zroot/swapdisk0 createtxg 8265142 - zroot/swapdisk0 copies 1 default zroot/swapdisk0 refreservation 20.6G local zroot/swapdisk0 guid 12592813906271140067 - zroot/swapdisk0 primarycache all default zroot/swapdisk0 secondarycache all default zroot/swapdisk0 usedbysnapshots 0 - zroot/swapdisk0 usedbydataset 20.2G - zroot/swapdisk0 usedbychildren 0 - zroot/swapdisk0 usedbyrefreservation 20.6G - zroot/swapdisk0 logbias latency default zroot/swapdisk0 dedup off default zroot/swapdisk0 mlslabel - zroot/swapdisk0 sync standard default zroot/swapdisk0 refcompressratio 1.00x - zroot/swapdisk0 written 0 - zroot/swapdisk0 logicalused 20.1G - zroot/swapdisk0 logicalreferenced 20.1G - zroot/swapdisk0 volmode geom local zroot/swapdisk0 snapshot_limit none default zroot/swapdisk0 snapshot_count none default zroot/swapdisk0 redundant_metadata all default zroot/swapdisk0@200909 type snapshot - zroot/swapdisk0@200909 creation Wed Sep 9 11:12 2020 - zroot/swapdisk0@200909 used 0 - zroot/swapdisk0@200909 referenced 20.2G - zroot/swapdisk0@200909 compressratio 1.00x - zroot/swapdisk0@200909 devices on default zroot/swapdisk0@200909 exec on default zroot/swapdisk0@200909 setuid on default zroot/swapdisk0@200909 createtxg 20490195 - zroot/swapdisk0@200909 xattr on default zroot/swapdisk0@200909 nbmand off default zroot/swapdisk0@200909 guid 6778261312202608185 - zroot/swapdisk0@200909 primarycache all default zroot/swapdisk0@200909 secondarycache all default zroot/swapdisk0@200909 defer_destroy off - zroot/swapdisk0@200909 userrefs 0 - zroot/swapdisk0@200909 mlslabel - zroot/swapdisk0@200909 refcompressratio 1.00x - zroot/swapdisk0@200909 written 20.2G - zroot/swapdisk0@200909 clones - zroot/swapdisk0@200909 logicalreferenced 20.1G - zroot/swapdisk0@200909 volmode geom inherited from zroot/swapdisk0 zroot/usr type filesystem - zroot/usr creation Mon May 27 23:31 2013 - zroot/usr used 131G - zroot/usr available 0 - zroot/usr referenced 50.9G - zroot/usr compressratio 1.00x - zroot/usr mounted yes - zroot/usr quota none default zroot/usr reservation none default zroot/usr recordsize 128K default zroot/usr mountpoint /usr local zroot/usr sharenfs off default zroot/usr checksum fletcher4 inherited from zroot zroot/usr compression off default zroot/usr atime on default zroot/usr devices on default zroot/usr exec on default zroot/usr setuid on default zroot/usr readonly off inherited from zroot zroot/usr jailed off default zroot/usr snapdir hidden default zroot/usr aclmode discard default zroot/usr aclinherit restricted default zroot/usr createtxg 21 - zroot/usr canmount on default zroot/usr xattr off temporary zroot/usr copies 1 default zroot/usr version 5 - zroot/usr utf8only off - zroot/usr normalization none - zroot/usr casesensitivity sensitive - zroot/usr vscan off default zroot/usr nbmand off default zroot/usr sharesmb off default zroot/usr refquota none default zroot/usr refreservation none default zroot/usr guid 3173040953131777265 - zroot/usr primarycache all default zroot/usr secondarycache all default zroot/usr usedbysnapshots 1K - zroot/usr usedbydataset 50.9G - zroot/usr usedbychildren 80.1G - zroot/usr usedbyrefreservation 0 - zroot/usr logbias latency default zroot/usr dedup off default zroot/usr mlslabel - zroot/usr sync standard default zroot/usr refcompressratio 1.00x - zroot/usr written 1K - zroot/usr logicalused 131G - zroot/usr logicalreferenced 50.7G - zroot/usr volmode default default zroot/usr filesystem_limit none default zroot/usr snapshot_limit none default zroot/usr filesystem_count none default zroot/usr snapshot_count none default zroot/usr redundant_metadata all default zroot/usr@200909 type snapshot - zroot/usr@200909 creation Wed Sep 9 11:12 2020 - zroot/usr@200909 used 1K - zroot/usr@200909 referenced 50.9G - zroot/usr@200909 compressratio 1.00x - zroot/usr@200909 devices on default zroot/usr@200909 exec on default zroot/usr@200909 setuid on default zroot/usr@200909 createtxg 20490195 - zroot/usr@200909 xattr on default zroot/usr@200909 version 5 - zroot/usr@200909 utf8only off - zroot/usr@200909 normalization none - zroot/usr@200909 casesensitivity sensitive - zroot/usr@200909 nbmand off default zroot/usr@200909 guid 15403344970624252860 - zroot/usr@200909 primarycache all default zroot/usr@200909 secondarycache all default zroot/usr@200909 defer_destroy off - zroot/usr@200909 userrefs 0 - zroot/usr@200909 mlslabel - zroot/usr@200909 refcompressratio 1.00x - zroot/usr@200909 written 50.9G - zroot/usr@200909 clones - zroot/usr@200909 logicalreferenced 50.7G - zroot/usr@200909 volmode default default zroot/usr/home type filesystem - zroot/usr/home creation Mon May 27 23:33 2013 - zroot/usr/home used 80.1G - zroot/usr/home available 0 - zroot/usr/home referenced 80.1G - zroot/usr/home compressratio 1.00x - zroot/usr/home mounted yes - zroot/usr/home quota none default zroot/usr/home reservation none default zroot/usr/home recordsize 128K default zroot/usr/home mountpoint /usr/home local zroot/usr/home sharenfs off default zroot/usr/home checksum fletcher4 inherited from zroot zroot/usr/home compression off default zroot/usr/home atime on default zroot/usr/home devices on default zroot/usr/home exec on default zroot/usr/home setuid on default zroot/usr/home readonly off inherited from zroot zroot/usr/home jailed off default zroot/usr/home snapdir hidden default zroot/usr/home aclmode discard default zroot/usr/home aclinherit restricted default zroot/usr/home createtxg 41 - zroot/usr/home canmount on default zroot/usr/home xattr off temporary zroot/usr/home copies 1 default zroot/usr/home version 5 - zroot/usr/home utf8only off - zroot/usr/home normalization none - zroot/usr/home casesensitivity sensitive - zroot/usr/home vscan off default zroot/usr/home nbmand off default zroot/usr/home sharesmb off default zroot/usr/home refquota none default zroot/usr/home refreservation none default zroot/usr/home guid 16701701910904504413 - zroot/usr/home primarycache all default zroot/usr/home secondarycache all default zroot/usr/home usedbysnapshots 1K - zroot/usr/home usedbydataset 80.1G - zroot/usr/home usedbychildren 0 - zroot/usr/home usedbyrefreservation 0 - zroot/usr/home logbias latency default zroot/usr/home dedup off default zroot/usr/home mlslabel - zroot/usr/home sync standard default zroot/usr/home refcompressratio 1.00x - zroot/usr/home written 1K - zroot/usr/home logicalused 80.0G - zroot/usr/home logicalreferenced 80.0G - zroot/usr/home volmode default default zroot/usr/home filesystem_limit none default zroot/usr/home snapshot_limit none default zroot/usr/home filesystem_count none default zroot/usr/home snapshot_count none default zroot/usr/home redundant_metadata all default zroot/usr/home@200909 type snapshot - zroot/usr/home@200909 creation Wed Sep 9 11:12 2020 - zroot/usr/home@200909 used 1K - zroot/usr/home@200909 referenced 80.1G - zroot/usr/home@200909 compressratio 1.00x - zroot/usr/home@200909 devices on default zroot/usr/home@200909 exec on default zroot/usr/home@200909 setuid on default zroot/usr/home@200909 createtxg 20490195 - zroot/usr/home@200909 xattr on default zroot/usr/home@200909 version 5 - zroot/usr/home@200909 utf8only off - zroot/usr/home@200909 normalization none - zroot/usr/home@200909 casesensitivity sensitive - zroot/usr/home@200909 nbmand off default zroot/usr/home@200909 guid 14302389932766417239 - zroot/usr/home@200909 primarycache all default zroot/usr/home@200909 secondarycache all default zroot/usr/home@200909 defer_destroy off - zroot/usr/home@200909 userrefs 0 - zroot/usr/home@200909 mlslabel - zroot/usr/home@200909 refcompressratio 1.00x - zroot/usr/home@200909 written 80.1G - zroot/usr/home@200909 clones - zroot/usr/home@200909 logicalreferenced 80.0G - zroot/usr/home@200909 volmode default default zroot/var type filesystem - zroot/var creation Mon May 27 23:40 2013 - zroot/var used 9.94G - zroot/var available 0 - zroot/var referenced 9.94G - zroot/var compressratio 1.00x - zroot/var mounted yes - zroot/var quota none default zroot/var reservation none default zroot/var recordsize 128K default zroot/var mountpoint /var local zroot/var sharenfs off default zroot/var checksum fletcher4 inherited from zroot zroot/var compression off default zroot/var atime on default zroot/var devices on default zroot/var exec on default zroot/var setuid on default zroot/var readonly off inherited from zroot zroot/var jailed off default zroot/var snapdir hidden default zroot/var aclmode discard default zroot/var aclinherit restricted default zroot/var createtxg 133 - zroot/var canmount on default zroot/var xattr off temporary zroot/var copies 1 default zroot/var version 5 - zroot/var utf8only off - zroot/var normalization none - zroot/var casesensitivity sensitive - zroot/var vscan off default zroot/var nbmand off default zroot/var sharesmb off default zroot/var refquota none default zroot/var refreservation none default zroot/var guid 15336045084130388053 - zroot/var primarycache all default zroot/var secondarycache all default zroot/var usedbysnapshots 1K - zroot/var usedbydataset 9.94G - zroot/var usedbychildren 0 - zroot/var usedbyrefreservation 0 - zroot/var logbias latency default zroot/var dedup off default zroot/var mlslabel - zroot/var sync standard default zroot/var refcompressratio 1.00x - zroot/var written 1K - zroot/var logicalused 9.93G - zroot/var logicalreferenced 9.93G - zroot/var volmode default default zroot/var filesystem_limit none default zroot/var snapshot_limit none default zroot/var filesystem_count none default zroot/var snapshot_count none default zroot/var redundant_metadata all default zroot/var@200909 type snapshot - zroot/var@200909 creation Wed Sep 9 11:12 2020 - zroot/var@200909 used 1K - zroot/var@200909 referenced 9.94G - zroot/var@200909 compressratio 1.00x - zroot/var@200909 devices on default zroot/var@200909 exec on default zroot/var@200909 setuid on default zroot/var@200909 createtxg 20490195 - zroot/var@200909 xattr on default zroot/var@200909 version 5 - zroot/var@200909 utf8only off - zroot/var@200909 normalization none - zroot/var@200909 casesensitivity sensitive - zroot/var@200909 nbmand off default zroot/var@200909 guid 12205140544561506623 - zroot/var@200909 primarycache all default zroot/var@200909 secondarycache all default zroot/var@200909 defer_destroy off - zroot/var@200909 userrefs 0 - zroot/var@200909 mlslabel - zroot/var@200909 refcompressratio 1.00x - zroot/var@200909 written 9.94G - zroot/var@200909 clones - zroot/var@200909 logicalreferenced 9.93G - zroot/var@200909 volmode default default I am lost lk
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