ZFS zfs receive cannot create snapshot with multi-snapshot stream

B

bvgdas

Hello,

Trivial task. Create backup of system bootable zfs pool with several datasets and then restore it.

system:

Code: 
root@:~ # uname -a
FreeBSD  13.0-RELEASE FreeBSD 13.0-RELEASE #0 releng/13.0-n244733-ea31abc261f: Fri Apr  9 04:24:09 UTC 2021     [email]root@releng1.nyi.freebsd.org[/email]:/usr/obj/usr/src/amd64.amd64/sys/GENERIC  amd64


pool:
Code: 
root@:~ # zpool status -v
  pool: zsys
 state: ONLINE
config:

        NAME        STATE     READ WRITE CKSUM
        zsys        ONLINE       0     0     0
          gpt/BSD   ONLINE       0     0     0

errors: No known data errors
root@:~ #

zfs datatests:
Code: 
root@:~ # zfs list
NAME                USED  AVAIL     REFER  MOUNTPOINT
zsys               2.38G  12.6G       24K  none
zsys/ROOT          2.38G  12.6G       24K  none
zsys/ROOT/default  2.38G  12.6G     2.38G  /

create backup:
Code: 
root@:~ # zfs snapshot -r zsys@backup
root@:~ # zfs send -Rv zsys@backup | xz > [email]zsys@backup.xz[/email]

Code: 
root@:~ # zfs list -t snapshot
NAME                       USED  AVAIL     REFER  MOUNTPOINT
zsys@backup                  0B      -       24K  -
zsys/ROOT@backup             0B      -       24K  -
zsys/ROOT/default@backup   784K      -     2.38G  -
root@:~ #

delete snapshot:
Code: 
root@:~ # zfs destroy -r zsys@backup
root@:~ # zfs list -t snapshot
no datasets available
root@:~ #

trying to restore saved stream to snapshot for further restore (rollback):
Code: 
root@:~ # xz -cdk [email]zsys@backup.xz[/email] | zfs receive -dv zsys@restore
cannot receive: specified fs (zsys@restore) does not exist
root@:~ #
Actually I expected that zfs creates zsys@restore snapshot and push there data from my stream recursively in the same sequence as it was created.

Code: 
root@:~ # zfs snapshot -r zsys@restore
root@:~ # zfs list -t snapshot
NAME                        USED  AVAIL     REFER  MOUNTPOINT
zsys@restore                  0B      -       24K  -
zsys/ROOT@restore             0B      -       24K  -
zsys/ROOT/default@restore     0B      -     2.38G  -
root@:~ #

root@:~ # xz -cdk [email]zsys@backup.xz[/email] | zfs receive -dv zsys@restore
cannot receive: cannot specify snapshot name for multi-snapshot stream
root@:~ #

As expected when I try to restore to bootable and mounted FS I get error:
Code: 
root@:~ # xz -cdk [email]zsys@backup.xz[/email] | zfs receive -Fv zsys
cannot unmount '/': unmount failed
root@:~ #


Please explain me how can I make backup/restore operation using zfs send/receive? Perhaps I make some mistakes while zfs send operation.
Don't offer me to backup every dataset separately and restore it accordingly.

zfs guru, help. :)
 
I cannot delete this thread
I realized an idea of zfs send/receive.
To restore system pool I need new storage for new pool.
Then I have to boot from memory stick, then create new system pool and finally restore (zfs send), created early backup, to newly created pool.
 
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