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Cc: freebsd-questions@freebsd.org
Subject: RE: zfs newbie question
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Hi,

   zpool create is a destructive command to data on the disks, ie any  
preexisting pool, but it would normally warn you if it found an  
existing pool on the disks you are trying to use.
Run:

# zpool import

and it will scan any attached disks for pools that are importable, if  
it detects your old pool then you can import it again via the zpool  
import <poolname> command,

cheers Andy.