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Re: Failing disk advice

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On 03/05/2017 01:02 PM, Gregory Seidman wrote:
> I have a disk that is reporting SMART errors. It is an active disk in a
> (kernel, not hardware) RAID1 configuration. I also have a hot spare in the
> RAID1, and md hasn't decided it should fail the disk and switch to the hot
> spare. Should I proactively tell md to fail the disk (and let the hot spare
> take over), or should I just wait until md notices a problem?

AFAIK desktop disks and "enterprise RAID" disks degrade differently. 
When a desktop disk is having trouble reading a sector, it will retry 
many times before giving up because it is likely the data does not exist 
anywhere else.  But, an enterprise RAID disc will retry only a few times 
and then fail; because the data should exist elsewhere and hung reads 
are intolerable in enterprise environments.  So, if you are using 
desktop disks in a RAID, you might need to manually intervene to 
compensate for the mismatch.


I'm confused by "I also have a hot spare in the RAID1".  Do you have a 
two-member RAID1 with a hot spare, or a three-member RAID1?  I would 
prefer the latter:

https://manpages.debian.org/jessie/mdadm/md.4.en.html


If you're planning on buying a fourth disk and adding it after fixing 
the RAID, can you add it now as a fourth RAID1 member, let it resilver, 
remove the failing disk from the RAID (e.g. reconfigure as three-member 
RAID1), and then pull the failing disk?


David

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Thread

Failing disk advice Gregory Seidman <gsslist+debian@anthropohedron.net> - 2017-03-05 22:20 +0100
  Re: Failing disk advice The Wanderer <wanderer@fastmail.fm> - 2017-03-05 23:50 +0100
  Re: Failing disk advice David Christensen <dpchrist@holgerdanske.com> - 2017-03-06 05:40 +0100
    Re: Failing disk advice Mirko Parthey <mirko.parthey@web.de> - 2017-03-06 12:20 +0100
      Re: Failing disk advice Gregory Seidman <gsslist+debian@anthropohedron.net> - 2017-03-07 02:30 +0100
        Re: Failing disk advice Patrick Zaloum <pzaloum@gmail.com> - 2017-03-07 17:30 +0100
    Re: Failing disk advice Andy Smith <andy@strugglers.net> - 2017-03-06 12:50 +0100

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