Date: Thu, 10 Sep 2020 18:13:09 +0200 From: Christoph Brinkhaus <c.brinkhaus@t-online.de> To: Ludovit Koren <ludovit.koren@gmail.com> Cc: FreeBSD Mailing List <freebsd-questions@freebsd.org> Subject: Re: ZFS snapshot - rollback problem Message-ID: <20200910161309.GA56432@esprimo> In-Reply-To: <CADZBGL4qz7RcLdjAoQSFYxaV53vfa0tb15xZ4WXcTK76hKUPVA@mail.gmail.com> References: <CADZBGL4C83JyMqHNP5A_aUV%2BddXxbd2F7RtCQhox4dCKKQAqLw@mail.gmail.com> <20200910143458.GA83264@esprimo> <CADZBGL4qz7RcLdjAoQSFYxaV53vfa0tb15xZ4WXcTK76hKUPVA@mail.gmail.com>
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On Thu, Sep 10, 2020 at 05:08:26PM +0200, Ludovit Koren wrote: > 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: Dear Ludovit, I make one comment here and some below. > > > 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 > > > Can it be that the disk is just full? It might make sense to disable swap temporary and free that space to help the system to recover. > > > 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 readyonly=off means read/write. It should be ok and is similar on my box. The source here is default but not local. May be at that time this setting has been default. > 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 This space can be used if swap is disabled. At that time no resource hungry application should run of course. > 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 Please stop hungry applications as far as possible. Then swap should become unnecessary and you can use the space to clean up. >From my understanding the setting readonly=off should not be the root cause. I will you success! Be patient - as if it would be so easy... Kind regards, Christoph > _______________________________________________ > freebsd-questions@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to "freebsd-questions-unsubscribe@freebsd.org"
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