ZFS snapshot - rollback problem

[Ludovit Koren]

>>>>> Christoph Brinkhaus <c.brinkhaus at t-online.de> writes:

    > On Thu, Sep 10, 2020 at 04:18:39PM +0200, Ludovit Koren wrote:
    > Dear Ludovit,

    > I quote the first message because I have a complete different idea.
    > I hope this is ok.

    >> 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 at 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

    > Is it possible that the pool has been generated using Centos?
    > Then the features of the pool might be different to that what
    > is supported by FreeBSD.

    > Kind regards,
    > Christoph

    >> 
    >> After zfs snapshot, which I did on the root, I got:
    >> ~>zfs list -t snapshot
    >> NAME                     USED  AVAIL  REFER  MOUNTPOINT
    >> zroot at 200909               1K      -  10.7G  -
    >> zroot/Centos8 at 200909       1K      -  2.67G  -
    >> zroot/msw7 at 200909          1K      -  19.1G  -
    >> zroot/swapdisk0 at 200909      0      -  20.2G  -
    >> zroot/usr at 200909           1K      -  50.9G  -
    >> zroot/usr/home at 200909      1K      -  80.1G  -
    >> zroot/var at 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?
    >> 
    >> 
    >> Any help is greatly appreciated.
    >> 
    >> 
    >> Regards,
    >> 
    >> 
    >> lk
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Just to sum up, at the end. I did backup of the FS and reinstall the
OS. I did not find the way to reset the FS to read-write mode.

Regards,

lk