Fixing vdev name

[Alexander Leidinger]

Quoting David Chisnall <theraven at freebsd.org> (from Wed, 19 Sep 2018  
15:16:16 +0100):

> Hello the list,
>
> I have a VM that uses ZFS with a pair of striped devices.  The first  
> is a partition on the root disk, created by the installer.  When  
> this was too small, I added another device (da1) and told the pool  
> to expand to use it (no redundancy, because the underlying storage  
> for the VM images provides that).  After a reboot, I can no longer  
> boot the system. Booting from the install CD and attempting to  
> import the pool, it correctly identifies da0p4 as one of the  
> devices, but gives me a long number instead of da1.

This means ZFS doesn't see the other device (or more correctly no  
device with the ZFS meta-data on the device which matches what the  
pool wants to see as the second vdev).

Do you see the second disk from non-ZFS tools? Does the partition info  
look OK there (if you partitioned it before giving it to ZFS)? Does  
the geometry/size look correct?

> How do I fix this so that the pool again points to da1?

As a side note, it doesn't matter if it is da1 or something else (e.g.  
/dev/gpt/<volid> or whatever), as long as it is a geom provider  
instead of the uuid of the device like it seems to be the case right  
now.

Bye,
Alexander.

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