zfs incremental backup - destination has been modified

Hi everyone,

I am trying todo an incremental backup of a zone(volume) tank/vol1/vserver to another pool backup on the same machine:

creating the snapshots is working. The first "full" copy works, but the second one fails.
I just followed the man page. I am doing something wrong?

Greetings,

Stephan

# zfs list
NAME USED AVAIL REFER MOUNTPOINT
backup 3.59G 69.7G 96K /backup
backup/vol1 3.59G 69.7G 96K /backup/vol1
backup/vol1/vserver 3.59G 69.7G 3.59G /backup/vol1/vserver
backup/vol1/vserver@diff 104K - 3.59G -
tank 21.7G 2.75G 18K /tank
tank/usr 21.6G 2.75G 21.3G /usr
tank/usr/ports 334M 2.75G 262M /usr/ports
tank/usr/ports/distfiles 72.0M 2.75G 72.0M /usr/ports/distfiles
tank/var 93.5M 2.75G 92.5M /var
tank/var/log 1000K 2.75G 1000K /var/log
tank2 225G 41.1G 96K /tank2/
tank2/vol1 225G 41.1G 221G /tank2//vol1
tank2/vol1/vserver 3.62G 41.1G 3.59G /tank2//vol1/vserver
tank2/vol1/vserver@init 31.1M - 3.59G -
tank2/vol1/vserver@diff 1.41M - 3.59G -
tank2/vol1/vserver@diff2 996K - 3.59G -

# zfs snapshot tank2/vol1/vserver@diff

# zfs send tank2/vol1/vserver@diff | zfs receive -dv backup
receiving full stream of tank2/vol1/vserver@diff into backup/vol1/vserver@diff
received 3.42Gb stream in 565 seconds (6.20Mb/sec)

# zfs send -i tank2/vol1/vserver@diff tank2/vol1/vserver@diff2 | zfs receive -vd backup
receiving incremental stream of tank2/vol1/vserver@diff2 into backup/vol1/vserver@diff2
cannot receive: destination has been modified since most recent snapshot
cannot send 'tank2/vol1/vserver@diff2': Broken pipe

# zfs snapshot tank2/vol1/vserver@diff2

# zfs send -i tank2/vol1/vserver@diff tank2/vol1/vserver@diff2 | zfs receive -vd backup
receiving incremental stream of tank2/vol1/vserver@diff2 into backup/vol1/vserver@diff2
cannot receive: destination has been modified since most recent snapshot
cannot send 'tank2/vol1/vserver@diff2': Broken pipe
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