[jmjsgi]

thank you very much for your feedback.
Thanks to jwhat for the command lines.
I checked the partition with the "part" command in "fx".



Here is the information on my disk:

   

https://imgur.com/wzLPyNZ

-----partitions------
part      type                         blocks                                                             megabytes           (base+size)
  0:        xfs                    266240 + 286483248                                             130 + 139884
  1:        raw                       4096 + 262144                                                       2 + 128
  8:        volhdr                        0 + 4096                                                            0 + 2   
10:        volume                       0 + 286749488                                                  0 + 140014

I created the BOOT directory in tmp and used the command to mount the disk in the BOOT directory.
"mount -t xfs -o ro /dev/dsk/dksXdYs0 /tmp/BOOT"
the system did not want to mount the disk as read-only.

   

https://imgur.com/6G6YBAY

So I typed the command:
mount -t xfs -o rw /dev/dsk/dksXdYs0 /tmp/BOOT

my disk is mounted correctly

I was able to access the contents of my disk (tezro) and comparing the disk of my Onyx, I saw that the var directory had disappeared.
I found it in the "user_data" directory.
I moved it to the root of my mounted tezro disk (tmp/BOOT).
Then I wanted to unmount the disk with umount:
umount -t xfs -o rw /dev/dsk/dksXdYs0 /tmp/BOOT
I got an error message (see photo)

   

https://imgur.com/I0h03AH

umount -a -t xfs /dev/dsk/dks0d2s0/ /tmp/BOOT
or
umount -a -t xfs /dev/dsk/dks0d2s0/
I couldn't take it apart.

   

https://imgur.com/bvkZ3Bn

Can you give me the command so I can do this without affecting the dks0d2s0 disk and even less the one on my onyx.

Thank you.