Hello Ceph-users,

I am currently testing / experimenting with Ceph with some extra hardware that 
is laying around.  I am running Nautilus on Ubuntu 18.04 (all nodes).

The problem statement is that I’d like to backup a FreeNAS server using ZFS 
Snapshots and replication to a Ceph cluster.

I created a linux VM inside FreeNAS and inside the VM I mounted the RBD device 
of the Ceph cluster.  I created a test block device, mounted it on the VM and 
created a ZFS pool on it.  I did a test replication to to the device inside the 
VM and it worked great.

My next what-if scenario is “what if I need to expand the zpool?”.  I unmounted 
the zpool, unmounted the RBD device, and then resized it using “rbd resize 
—size <newsize> rbd1”.  Then I remounted the RBD device.  No problems here.  
However, when I mount the zpool and expand it (zpool import /dev/rbd0; zpool 
online -e vol) I get a panic.

Any thoughts as to what could be wrong?

Thanks!

George

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