Hello All, I recently upgrade a test system that had a zpool (test_pool) from S10u5 to S10U6-zfsroot by simply replacing the root disks. I exported the zpool before I init 5''ed the system. On S10u5, the zpool vdevs were on c2t#d#. On S10U6-zfsroot, the zpool vdevs were on c4t#d#. I ran zpool import to see the pool and everything showed up ok. I then ran zpool import test_pool and import was successful. I was asked to upgrade zpool version so I performed a zpool upgrade test_pool. Next, I ran zpool status test_pool. To my surprise, my hot spare had the old c2t#d# vdev name and was unavailable. All other zpool vdevs had the new c4t#d# names. I tried exporting the zpool one more time. I reviewed the output of zpool import, it showed zpool test_pool with all the correct vdevs names(c4t#d#) as online. I then pulled the spare and the spare vdev name changed from c4t#d# online to c2t#d# unavailable. Re-inserted the spare and all zpool vdevs are c4t#d# and online. I re-imported the zpool but zpool status still showed spare with old vdev name and unavailable. Has anyone seen this, if so how can I clean/reset/update/fix the zpool vdev names? Thanks for your replies. -- This message posted from opensolaris.org