Re: SMART detects pending sectors; take offline?

[Mark Knecht <markknecht@gmail.com>]

On Thu, Oct 12, 2017 at 6:16 AM, Alexander Shenkin <al@shenkin.org> wrote:
> On 10/12/2017 2:04 PM, Phil Turmel wrote:
>>
>> On 10/12/2017 07:01 AM, Wols Lists wrote:
>>>
>>> On 12/10/17 10:50, Alexander Shenkin wrote:
>>>>
>>>> Thanks Phil... Googling around, I haven't found a way to change it
>>>> either, but then again, I'm not really sure what to search for.
>>>>
>>>> What about changing my default disk timeout to something less than 120
>>>> secs?  Say, 100 secs instead of 180?
>>
>>
>> Nope.  The number has to be longer than the actual longest timeout of
>> your drive, which we now know is >120.  When I first investigated this
>> phenomenon years ago, I picked 120 for my timeouts.  Other reports
>> reached the list with the need for longer, and the recommendation for
>> 180 was chosen.
>>
>> If the driver times out, it resets the SATA connection while the drive
>> is still in la-la land.  MD gets the error and tries to write the fixed
>> sector.  The SATA connection is still resetting at that point, and MD
>> gets a *write* error, which boots that drive out of the array.
>
>
> Thanks Phil.  Lots of questions in my head, but all rather newbie-ish and
> don't want to bother folks, so I'll just wait till you experts hash it out
> and then will follow recommendations...
>
> thanks,
> allie

Not an expert here but on my Gentoo systems all running kernel 4.12.12 I
have the hangcheck timer disabled. Using it does not appear to be a
hard requirement.

- Mark