Tom Servo wrote:
>>> How can I diagnose why a resilver appears to be hanging at a certain
>>> percentage, seemingly doing nothing for quite a while, even though the
>>> HDD LED is lit up permanently (no apparent head seeking)?
>>>
>>> The drives in the pool are WD Raid Editions, thus have TLER and should
>>> time out on errors in just seconds. ZFS nor the syslog however were
>>> reporting any IO errors, so it weren't the disks.
>>>
>>
>> Check the FMA logs:
>>   fmadm faulty
>>   fmdump -e[vV]
>
> Nothing noteworthy in there. fmadm shows nothing, fmdump just 
> ereport.io.ddi.fm-capability repeatedly, which comes from oss_cmi8788 
> (some OpenSound driver).

argv!  Can you try to dd from the misbehaving device and see if
that kicks off a diagnosis?  It may take some time to timeout, though,
by default it will be several minutes per iop.  (for the geezers, format
has had a media scanner for decades)
 -- richard

>>
>>> Stopping the scrub didn't work, the zfs command didn't return. It 
>>> took a
>>> hard reset to make it stop.
>>>
>>
>> scrub is not a zfs subcommand, perhaps you meant zpool?
>> Depending on the failure, zpool commands may hang, fixed in b100.
>
> Yeah, sorry, zpool doesn't return.
>
> Regards,
> -mg

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