Re: How often to run self-tests?

On 15 Dec 2013 09:25, "Christian Franke" <[email protected]>
wrote:
>
> Ivan Lezhnjov Jr. wrote:
>
>> On Dec 15, 2013, at 4:58 AM, Weedy <...> wrote:
>>
>>> A very long time ago I found this and use it everywhere now. I don't
even remember what the options mean anymore.
>>> /dev/sda -d ata -o off -S on -a -s
(O/../../(7|3)/00|S/../.././12|L/../../6/03|C/../../7/03) -m root
>>
>> I read all man pages, was a bit painful haha but I can read that line
like English now :P
>
>
> You are welcome to provide (well tested and reviewed) patches(!) for the
man page files.
>
>
>
>> Stiil, wondering if there's any theory behind how fast these types of
checks should be run. One thing is obvious, SMART is meant to expose a
problem before it becomes a real problem of sorts. So, perhaps running the
tests somewhat often is a good idea. But how often that IS the question.
>
>
> It depends and may require some experiments.
>
> For servers running 7x24, one short test per day and one long test per
week is a good starting point.
>
> For desktop systems running 5x8, long tests may not work at all because:
> - OS accesses may slow down the self-test such that it cannot be
completed during working hours,
> and/or
> - the self-test may slow down the OS accesses such that the system is
unusable.
>
> This depends on the vendor specific self-test implementation in drive
firmware.
>
>
>
>>> I have a follow up question for this. I can drop the /dev/sdX and use
DEVICESCAN right?
>>
>> Absolutely
>
>
> Note that DEVICESCAN does not work for drives behind most RAID
controllers. Possible implementations would be vendor and platform specific.

Mdadm raid, soon to be brtfs raid. This isn't a problem

>>> How would I tell smartd to stagger the tests if I have a 4+ drive raid?
>
>
> Automatic staggering of tests is not possible yet. You need to add an
individual smartd.conf entry for each drive.
>
> I agree that this feature would make sense. Please create a ticket:
> https://sourceforge.net/apps/trac/smartmontools/newticket
Sure

>
> Thanks,
> Christian
>

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