After some errors were logged as to a problem with a ZFS file system, I ran zfs status followed by zfs status -v... # zpool status pool: ehome 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: none requested config: NAME STATE READ WRITE CKSUM ehome ONLINE 6.28K 2.84M 0 c2t0d0p0 ONLINE 6.28K 2.84M 0 errors: 796332 data errors, use ''-v'' for a list [ elided ] # zpool status -v pool: ehome 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: none requested config: NAME STATE READ WRITE CKSUM ehome ONLINE 3.03K 2.09M 0 c2t0d0p0 ONLINE 3.03K 2.09M 0 << HANGS HERE>> From another window do a truss of zfs status... ioctl(3, ZFS_IOC_ERROR_LOG, 0x08041DE0) Err#12 ENOMEM ioctl(3, ZFS_IOC_ERROR_LOG, 0x08041DE0) Err#12 ENOMEM ioctl(3, ZFS_IOC_ERROR_LOG, 0x08041DE0) Err#12 ENOMEM ioctl(3, ZFS_IOC_ERROR_LOG, 0x08041DE0) Err#12 ENOMEM ioctl(3, ZFS_IOC_ERROR_LOG, 0x08041DE0) Err#12 ENOMEM ioctl(3, ZFS_IOC_ERROR_LOG, 0x08041DE0) Err#12 ENOMEM One would think it would get the message.... After a reboot, a move of the drive to another UFS port on the laptop, a zfe export of ehome and a zfs import of ehome, it is back on line with zero errors....