Re: SMART Uncorrectable_Error_Cnt rising - should I be worried?

From	David Christensen <dpchrist@holgerdanske.com>
Newsgroups	linux.debian.user
Subject	Re: SMART Uncorrectable_Error_Cnt rising - should I be worried?
Date	2024-01-11 03:20 +0100
Message-ID	<HUSPL-2gdQ-1@gated-at.bofh.it> (permalink)
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On 1/10/24 09:07, Curt wrote:
> On 2024-01-10, David Christensen <dpchrist@holgerdanske.com> wrote:
>> Given the OP's situation -- 8 consumer SSD's, same make and model,
>> possibly from a defective manufacturing batch, all purchased at the same
>> time, all deployed in the same RAID-6, all run 2.5 years 24x7, and all
>> suddenly showing lots of SMART warnings -- I would not have confidence
>> in that RAID.
> 
> It's curious, but I just heard something on French TV from a journalist
> that's relevant to this. She said she'd covered the aeronautics field in
> the past and mentioned the *principe de dissemblance* (dissimilarity
> principle). Critical redundant parts on aircraft, she claimed, would be
> sourced from different manufacturers in order to obviate the possibility
> of redundant failures you've raised here.

https://en.wikipedia.org/wiki/Failure_analysis

Using components from different vendors is a known mitigation technique 
and can help in the right situations.

Relevant to this this thread, some people use disk drives from different 
manufacturers in their RAID's.  Doing so with RAID-10 (stripe of 
mirrors) is straight forward -- within each mirror, use brand A for the 
first disk, brand B for the second, brand C for the third (or hot 
spares), etc..  It then makes sense to do the same with HBA's -- use HBA 
brand X for the first disks in each mirror, HBA brand Y for the second 
disks, HBA brand Z for the third/ spare disks, etc..  For x86 
workstations and servers, ECC memory, dual network interfaces, and dual 
power supplies come to mind.  I am unclear about dual processors and/or 
dual memory banks.  Moving beyond one computer, the process continues 
with KVM/ serial console fabric, networks, electric power, cooling, 
etc..  It's just a question of what failure modes you want to protect 
against and how much time and money you want to spend.

David

Thread

SMART Uncorrectable_Error_Cnt rising - should I be worried? The Wanderer <wanderer@fastmail.fm> - 2024-01-09 14:20 +0100
  Re: SMART Uncorrectable_Error_Cnt rising - should I be worried? Dan Ritter <dsr@randomstring.org> - 2024-01-09 16:00 +0100
    Re: SMART Uncorrectable_Error_Cnt rising - should I be worried? The Wanderer <wanderer@fastmail.fm> - 2024-01-09 16:30 +0100
      Re: SMART Uncorrectable_Error_Cnt rising - should I be worried? Michael Kjörling <2695bd53d63c@ewoof.net> - 2024-01-09 19:50 +0100
  Re: SMART Uncorrectable_Error_Cnt rising - should I be worried? Curt <curty@free.fr> - 2024-01-09 17:20 +0100
    Re: SMART Uncorrectable_Error_Cnt rising - should I be worried? The Wanderer <wanderer@fastmail.fm> - 2024-01-09 19:20 +0100
  Re: SMART Uncorrectable_Error_Cnt rising - should I be worried? Michael Kjörling <2695bd53d63c@ewoof.net> - 2024-01-09 17:30 +0100
    Re: SMART Uncorrectable_Error_Cnt rising - should I be worried? The Wanderer <wanderer@fastmail.fm> - 2024-01-09 19:30 +0100
      Re: SMART Uncorrectable_Error_Cnt rising - should I be worried? Michael Kjörling <2695bd53d63c@ewoof.net> - 2024-01-09 20:10 +0100
        Re: SMART Uncorrectable_Error_Cnt rising - should I be worried? The Wanderer <wanderer@fastmail.fm> - 2024-01-09 20:30 +0100
          Re: SMART Uncorrectable_Error_Cnt rising - should I be worried? The Wanderer <wanderer@fastmail.fm> - 2024-02-15 04:00 +0100
            Re: SMART Uncorrectable_Error_Cnt rising - should I be worried? songbird <songbird@anthive.com> - 2024-02-15 07:20 +0100
              Re: SMART Uncorrectable_Error_Cnt rising - should I be worried? The Wanderer <wanderer@fastmail.fm> - 2024-02-15 16:50 +0100
            Re: SMART Uncorrectable_Error_Cnt rising - should I be worried? David Christensen <dpchrist@holgerdanske.com> - 2024-02-15 09:20 +0100
              Re: SMART Uncorrectable_Error_Cnt rising - should I be worried? The Wanderer <wanderer@fastmail.fm> - 2024-02-15 16:50 +0100
                Re: SMART Uncorrectable_Error_Cnt rising - should I be worried? Michael Kjörling <2695bd53d63c@ewoof.net> - 2024-02-15 18:40 +0100
                Re: SMART Uncorrectable_Error_Cnt rising - should I be worried? David Christensen <dpchrist@holgerdanske.com> - 2024-02-16 11:00 +0100
                Re: SMART Uncorrectable_Error_Cnt rising - should I be worried? "Roy J. Tellason, Sr." <roy@rtellason.com> - 2024-02-16 20:00 +0100
                Re: SMART Uncorrectable_Error_Cnt rising - should I be worried? David Christensen <dpchrist@holgerdanske.com> - 2024-02-16 21:00 +0100
                Re: SMART Uncorrectable_Error_Cnt rising - should I be worried? Gremlin <scott-andrews@columbus.rr.com> - 2024-02-16 22:50 +0100
                Re: SMART Uncorrectable_Error_Cnt rising - should I be worried? "Roy J. Tellason, Sr." <roy@rtellason.com> - 2024-02-17 19:50 +0100
                Re: SMART Uncorrectable_Error_Cnt rising - should I be worried? gene heskett <gheskett@shentel.net> - 2024-02-18 02:50 +0100
            Re: SMART Uncorrectable_Error_Cnt rising - should I be worried? debian-user@howorth.org.uk - 2024-02-15 13:20 +0100
              Re: SMART Uncorrectable_Error_Cnt rising - should I be worried? The Wanderer <wanderer@fastmail.fm> - 2024-02-15 16:10 +0100
  Re: SMART Uncorrectable_Error_Cnt rising - should I be worried? David Christensen <dpchrist@holgerdanske.com> - 2024-01-09 23:40 +0100
    Re: SMART Uncorrectable_Error_Cnt rising - should I be worried? David Christensen <dpchrist@holgerdanske.com> - 2024-01-09 23:50 +0100
    Re: SMART Uncorrectable_Error_Cnt rising - should I be worried? Michael Kjörling <2695bd53d63c@ewoof.net> - 2024-01-10 10:40 +0100
      Re: SMART Uncorrectable_Error_Cnt rising - should I be worried? David Christensen <dpchrist@holgerdanske.com> - 2024-01-10 16:40 +0100
        Re: SMART Uncorrectable_Error_Cnt rising - should I be worried? Curt <curty@free.fr> - 2024-01-10 18:10 +0100
          Re: SMART Uncorrectable_Error_Cnt rising - should I be worried? Michael Kjörling <2695bd53d63c@ewoof.net> - 2024-01-10 18:40 +0100
            Re: SMART Uncorrectable_Error_Cnt rising - should I be worried? David Christensen <dpchrist@holgerdanske.com> - 2024-01-11 03:30 +0100
          Re: SMART Uncorrectable_Error_Cnt rising - should I be worried? Dan Ritter <dsr@randomstring.org> - 2024-01-10 18:40 +0100
          Re: SMART Uncorrectable_Error_Cnt rising - should I be worried? David Christensen <dpchrist@holgerdanske.com> - 2024-01-11 03:20 +0100
            Re: SMART Uncorrectable_Error_Cnt rising - should I be worried? Dan Ritter <dsr@randomstring.org> - 2024-01-11 15:10 +0100
              Re: SMART Uncorrectable_Error_Cnt rising - should I be worried? David Christensen <dpchrist@holgerdanske.com> - 2024-01-11 16:10 +0100
                Re: SMART Uncorrectable_Error_Cnt rising - should I be worried? Dan Ritter <dsr@randomstring.org> - 2024-01-11 19:30 +0100
              Re: SMART Uncorrectable_Error_Cnt rising - should I be worried? Stefan Monnier <monnier@iro.umontreal.ca> - 2024-01-11 21:30 +0100
                Re: SMART Uncorrectable_Error_Cnt rising - should I be worried? Michael Stone <mstone@debian.org> - 2024-01-12 00:00 +0100
                Re: SMART Uncorrectable_Error_Cnt rising - should I be worried? Dan Ritter <dsr@randomstring.org> - 2024-01-12 12:20 +0100
                Re: SMART Uncorrectable_Error_Cnt rising - should I be worried? The Wanderer <wanderer@fastmail.fm> - 2024-02-15 16:50 +0100

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