On Jan 17, 2012, at 4:11 AM, Anonymous Remailer (austria) wrote:
> I have a desktop system with 2 ZFS mirrors. One drive in one mirror is
> starting to produce read errors and slowing things down dramatically. I
> detached it and the system is running fine. I can't tell which drive it is
> though! The error message and format command let me know which pair the bad
> drive is in, but I don't know how to get any more info than that like the
> serial number etc. to know which disk it is. Is there a command to do this?
> All it shows is a 500G WD drive producing read errors and format shows
> identical info for both of the 500G WD drives.

If the errors bubble up to ZFS, then they will be shown in the output of "zpool 
Otherwise, you can use "iostat -En," as Casper noted, to show the error counters
per disk. For more detailed information, use "fmdump -eV"
 -- richard 

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