I''ve had this happen once or twice now, running n74. I''ll run ''zpool scrub'' on my root pool and *immediately* get an error reported: # zpool status -v tank pool: tank state: ONLINE status: One or more devices has experienced an error resulting in data corruption. Applications may be affected. action: Restore the file in question if possible. Otherwise restore the entire pool from backup. see: http://www.sun.com/msg/ZFS-8000-8A scrub: scrub in progress, 0.76% done, 0h41m to go config: NAME STATE READ WRITE CKSUM tank ONLINE 0 0 0 mirror ONLINE 0 0 0 c0t0d0s0 ONLINE 0 0 0 c3t0d0s0 ONLINE 0 0 0 errors: Permanent errors have been detected in the following files: //dev/dsk/c0t0d0s0 I *assume* that this is talking about the /dev/dsk/c0t0d0s0 *file*, not the device. Removing the file immediately causes ''zpool status'' to report the error as ''tank/rootfs:<0x3840d>''. Recreating the device file at this point makes no difference. No matter what I do, though, the pool is magically clean at the end of the scrub. Is this a known bug? Scott