ZFS snapshot - rollback problem

[David Christensen]

On 2020-09-10 23:31, Ludovit Koren wrote:
> On Friday, September 11, 2020, David Christensen ... wrote:
> 
>> On 2020-09-10 07:18, Ludovit Koren wrote:

>>> ~>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

>> 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 find it very useful to show the date, time, username, hostname, and 
path in my shell prompt.  I use the toor account, the Bash shell, and 
export PS1 in ~/.profile:

2020-09-11 00:31:08 toor at f3 ~
# grep 'export PS1' .profile
export PS1='\n\D{%Y-%m-%d %H:%M:%S} '${USER}'@\h \w\n\$ '


> I think at that time it was a workaround how to install on the zfs. 

Please run and post:

# zfs list


> I did not changed it, since. No the FreeBSD is
> running from the disk. I have neither multiple system disks, nor
> multi-boot.

Okay.


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

Okay.


> After zfs snapshot, which I did on the root,

>> Please post your console session.

?


>   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)

Okay.


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

Please run and post:

# gpart show -l


Did you partition the disk by hand, use the FreeBSD installer, or 
something else?


> 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)

Okay.  zroot is mounted at /, which makes sense.


> 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

Okay.


Please post a console session showing the ZFS snapshot and rollback 
problem(s).


David