SATA disk disappears

[Warren Block]

On Sat, 12 Jan 2013, Christian Gusenbauer wrote:

> On Friday 11 January 2013 22:47:03 Warren Block wrote:
>> On Fri, 11 Jan 2013, Wojciech Puchar wrote:
>>>>> GEOM_MIRROR: Component ada2 (device home1) broken, skipping.
>>>>> GEOM_MIRROR: Cannot add disk ada2 to home1 (error=22).
>>>>>
>>>>>
>>>>> started gmirror rebuild and it now works at full speed.
>>>>>
>>>>> GEOM_MIRROR: Device home1: rebuilding provider ada2.
>>>>>
>>>>>
>>>>> What kind of hardware failure may it be? smartctl -a /dev/ada2 shows
>>>>> disk is fine.
>>>>
>>>> I had a new WD drive recently that had a write error.  Reallocated
>>>> sector count did not go up, but it quickly failed the SMART self-test,
>>>> short or long.  See smartctl(8) about the -t parameters.
>>>
>>> this is WD "green" 3TB
>>
>> 1T Red here.  The firmware is likely very similar.
>
> The same here: brandnew WD 2T green, 9.1 stable, svn rev. 244773, not using
> GEOM. I had that problem two times within the last two weeks, but the smart
> self tests can not find any errors/bad sectors.

Hmm.  The green drives are supposed to go to sleep for power saving, and 
then there's a multiple-second delay when they have to spin back up on 
access.  That should not be a problem for gmirror, but maybe it is. 
sysutils/ataidle can turn on the spindown.  Some drives do not accept 
that command, or claim to accept it but ignore it.  Worth a try, though.