SUMMARY: Disk marked UNAVAIL / "cannot open" in zpool

Thanks for the responses I received regarding my storage issue on the X4200
M2. Most of the responses suggested looking into hardware issues. I worked
with the hardware vendor and didn't find any glaring issues on that side; the
array showed healthy, including the problem device.

This was ultimately tracked down to a label issue on the device. Somehow the
label got reverted to an SMI type label. Running format wouldn't allow a
relabel and a prtvtoc/fmthard from another disk of the same geometry failed
with errors. I had to run a 'format -e', label the device and select EFI label
type, re-run prtvtoc/fmthard, and the device and pool became available. The
data remained intact.

Thanks again for the responses,

Tim