Date: Fri, 17 Apr 2020 15:06:14 +0200 From: Ruben <mail@osfux.nl> To: freebsd-questions@freebsd.org Subject: Re: iscsi + restoring zfs snapshot Message-ID: <0027cc2b-124f-bef3-f1aa-5c50a1c819b1@osfux.nl> In-Reply-To: <0ead1643-0fa3-3a89-2d2b-9086a46af6f6@osfux.nl> References: <0ead1643-0fa3-3a89-2d2b-9086a46af6f6@osfux.nl>
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Hi,
Still having trouble understanding this...
Any pointers?
Regards,
Ruben
On 4/12/20 11:10 AM, Ruben via freebsd-questions wrote:
>
> Hi,
>
> I have a couple of linux clients that mount an iscsi target provided by
> a zfs filesystem on a FreeBSD host.
> Yesterday I messed things up and I am trying to restore a snapshot to
> revert the changes.
>
> I seem to be able to do so, but since the result is somewhat unexepected
> I'm probably going the wrong way about it. The strange thing is that
> the snapshot restored from 2 weeks ago contains changes from last night :S
>
> This is the FS:
>
> zfs get all data/Docker/torrent
> NAME PROPERTY VALUE SOURCE
> data/Docker/torrent type volume -
> data/Docker/torrent creation Sun Dec 1 21:04 2019 -
> data/Docker/torrent used 56.8G -
> data/Docker/torrent available 93.0G -
> data/Docker/torrent referenced 19.7G -
> data/Docker/torrent compressratio 1.00x -
> data/Docker/torrent reservation none default
> data/Docker/torrent volsize 30G local
> data/Docker/torrent volblocksize 8K default
> data/Docker/torrent checksum on default
> data/Docker/torrent compression off default
> data/Docker/torrent readonly off default
> data/Docker/torrent createtxg 22810439 -
> data/Docker/torrent copies 1 default
> data/Docker/torrent refreservation 30.9G local
> data/Docker/torrent guid 15050313927458195147 -
> data/Docker/torrent primarycache all default
> data/Docker/torrent secondarycache all default
> data/Docker/torrent usedbysnapshots 6.12G -
> data/Docker/torrent usedbydataset 19.7G -
> data/Docker/torrent usedbychildren 0 -
> data/Docker/torrent usedbyrefreservation 30.9G -
> data/Docker/torrent logbias latency default
> data/Docker/torrent dedup off default
> data/Docker/torrent mlslabel -
> data/Docker/torrent sync standard default
> data/Docker/torrent refcompressratio 1.00x -
> data/Docker/torrent written 17.1K -
> data/Docker/torrent logicalused 12.1G -
> data/Docker/torrent logicalreferenced 9.25G -
> data/Docker/torrent volmode dev local
> data/Docker/torrent snapshot_limit none default
> data/Docker/torrent snapshot_count none default
> data/Docker/torrent redundant_metadata all default
>
> These are its snapshots:
>
> zfs list -t snapshot -r data/Docker/torrent
> NAME USED AVAIL REFER
> MOUNTPOINT
> data/Docker/torrent@2020-02-15_09.05.00--90d 677M - 6.30G -
> data/Docker/torrent@2020-02-22_09.05.00--90d 783M - 6.57G -
> data/Docker/torrent@2020-02-29_09.05.00--90d 798M - 6.65G -
> data/Docker/torrent@2020-03-07_09.05.00--90d 693M - 8.71G -
> data/Docker/torrent@2020-03-14_09.05.00--90d 684M - 11.2G -
> data/Docker/torrent@2020-03-21_09.05.00--90d 611M - 13.9G -
> data/Docker/torrent@2020-03-28_09.05.00--90d 864M - 18.1G -
> data/Docker/torrent@2020-04-04_09.05.00--90d 17.1K - 19.7G -
> [root@gneisenau:/usr/home/fux]#
>
> This is my restore attempt:
>
> zfs send data/Docker/torrent@2020-03-14_09.05.00--90d | zfs receive
> data/restoredfromsnapshot
>
> If I unmount the FS from the client, and export this new FS instead as:
>
> lun 3 {
> path /dev/zvol/data/restoredfromsnapshot
> size 30G
> }
>
> , restart ctld, mount that on the same linux client (but with the "ro"
> option):
>
> /dev/sdd on /mnt/restored_data type ext4 (ro,noatime,stripe=256,_netdev)
>
> it contains :
>
> root@torrent:/mnt/restored_data# ls -laht
> total 44K
> drwxr-xr-x 5 root root 4.0K Apr 12 10:23 ..
> drwx--x--x 14 root root 4.0K Apr 11 21:06 docker
> drwxrwxr-x 8 root root 4.0K Apr 11 20:57 .
> drwxr-xr-x 3 root root 4.0K Apr 11 20:57 deluge_config
> drwxr-xr-x 3 root root 4.0K Apr 11 20:57 docker_volumes
> drwxr-xr-x 2 root root 4.0K May 21 2019 downloads
> drwxr-xr-x 2 root root 4.0K May 21 2019 sickrage
> drwx------ 2 root root 16K May 21 2019 lost+found
> root@torrent:/mnt/restored_data#
>
> changes from way after 2020-03-14 , including those from last night .
>
> Huh? I'm using zfSnap for creating the snapshots, like this:
>
> /usr/local/sbin/zfSnap -s -z -a 90d -r data/Docker
>
> My first attempt to rollback yesterday's changes involved using the
> rollback option ( zfs rollback -r
> data/Docker/torrent@2020-04-04_09.05.00--90d ) but that did not work
> either (yesterday's changes were not reverted).
>
> Somebody got any insights as to why i'm unable to revert yesterday's
> changes?
>
> Any feedback appreciated!
>
> Kind regards,
>
> Ruben
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