Adding disk (with wrong block size) to existing zpool - block size?

At the moment, we set the block size to 4096 in vdc.conf for ldoms and then create the oracle DB zpools.

ZDB for the zpool reports 12 - which is correct I believe.

Anyway, we've moved over to new disks. We achieved this by adding the new vdisk to the mirror, allowing it to resilver, then removing old disks (so we're left with new disks only).

Then we realised we'd not added an entry into vdc.conf for the new disks.

BUT, ZDB still reports 12.

Yes, we could add the old disks back in, take new ones, edit vdc.conf, repeat process (but its 75 vdisks).