Re: Long test taking ages

On 2016-10-08 19:32, Gandalf Corvotempesta wrote:
> 2016-10-08 16:45 GMT+02:00 Carlos E. R. <>:
>> I would compare the exact hardware and type of load on those machines
>> trying to find coincidences.
> 
> Ok, i'll check. Keep in mind that when this happens, smart reports 0%
> remaining for many many hours.

I don't know about that.

> Another question: do you know the meaning of: "Require Write or
> Reassign Blocks command"
> shown doing "smartctl -x" on a SAS disk?

I'm not familiar with "-x", I normally use "-a". But let me guess. It
may be related to the Current_Pending_Sector and Offline_Uncorrectable
lines in the table of smart attributes.

When the disk hardware detects an error in a sector, on the next write
operation on that sector it remaps it to another place that was reserved
during manufacture for that purpose. Typically the error is detected on
reads, so it waits. A non-zero result appears on those lines. My brute
force approach is to write zeroes to the entire partition (or disk) in
order to force the reallocation, then restore from backup.

If this is what happens to you, it would also explain your problem. When
the disk hits a bad sector, the system tries several times to read it,
forcing everything else to wait. Thus other computers in your
installation would be fine, no bad sectors.

-- 
Cheers / Saludos,

		Carlos E. R.
		(from 13.1 x86_64 "Bottle" at Telcontar)

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