ZFS snapshot - rollback problem

[Ludovit Koren]

On Friday, September 11, 2020, David Christensen <dpchrist at holgerdanske.com>
wrote:

> On 2020-09-10 07:18, Ludovit Koren wrote:
>
>> Hi,
>>
>
> Hello. :-)
>
>
> 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
>>
>
> Thank you for posting that.
>
>
> Do you understand the difference between RELEASE and STABLE?
>
> https://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/
> current-stable.html
>
>
>
>
I think, I do.


> ~>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
>>
>
>
> I do not understand how your system can work at all if the root filesystem
> is mounted at /mnt (?).  Is your FreeBSD running on a different disc?  Do
> you have a multiple system disks, multi-boot, etc.?
>
>
>  If you see the time of creation, I think at that time it was a workaround
how to install on the zfs. I did not changed it, since. No the FreeBSD is
running from the disk. I have neither multiple system disks, nor
multi-boot.

In the /boot/loader.conf I have vfs.root.mountfrom="zfs.zroot"

After zfs snapshot, which I did on the root,
>>
>
> Please post your console session.
>
>
> Please run the following commands and post the console session:
>
> # camcontrol devlist


> # gpart show
>
> # mount
>
> # zpool status
>
>
>
>  camcontrol devlist

<Samsung SSD 840 PRO Series DXM04B0Q>  at scbus0 target 0 lun 0 (ada0,pass0)
<AHCI SGPIO Enclosure 2.00 0001>   at scbus3 target 0 lun 0 (pass1)

gpart show
=>       34  500118125  ada0  GPT  (238G)
         34        128     1  freebsd-boot  (64K)
        162  500117997     2  freebsd-zfs  (238G)

mount
zroot on / (zfs, local, nfsv4acls)
devfs on /dev (devfs, local, multilabel)
fdescfs on /dev/fd (fdescfs)
procfs on /proc (procfs, local)
linprocfs on /compat/linux/proc (linprocfs, local)
zroot/usr on /usr (zfs, local, nfsv4acls)
zroot/usr/home on /usr/home (zfs, local, nfsv4acls)
zroot/var on /var (zfs, local, nfsv4acls)
tmpfs on /var (tmpfs, local)
map -hosts on /net (autofs)
map -media on /media (autofs)
tmpfs on /tmp (tmpfs, local)

zpool status
  pool: zroot
 state: ONLINE
status: Some supported features are not enabled on the pool. The pool can
        still be used, but some features are unavailable.
action: Enable all features using 'zpool upgrade'. Once this is done,
        the pool may no longer be accessible by software that does not support
        the features. See zpool-features(7) for details.
  scan: resilvered 0 in 0 days 00:00:00 with 0 errors on Sat Apr  6
20:39:05 2019
config:

        NAME         STATE     READ WRITE CKSUM
        zroot        ONLINE       0     0     0
          gpt/disk0  ONLINE       0     0     0

errors: No known data errors