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Re: RAID-1 and disk I/O

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On 7/18/21 2:29 PM, Urs Thuermann wrote:
> David Christensen <dpchrist@holgerdanske.com> writes:
> 
>> You should consider upgrading to Debian 10 -- more people run that and
>> you will get better support.
> 
> It's on my TODO list.  As well as upgrading the very old hardware.
> Currently, it's a Gigabyte P35-DS3L with an Intel Core2Duo E8400 CPU
> and 8 GB RAM.  It's only my private home server and performance is
> still sufficient but I hope to reduce power consumption considerably.


I ran Debian on desktop hardware as a SOHO server for many years, but 
grew concerned about bit rot.  So, I migrated to low-end enterprise 
hardware and FreeBSD with ZFS.  The various SATA battles made things 
tougher than they should have been, but I fixed several problems and 
everything is now stable.


>>> # diff -U20 <(smartctl -x /dev/sda) <(smartctl -x /dev/sdb)
>>
>>
>> Why limit unified context to 20 lines?  You may be missing information
>> (I have not counted the differences, below).  I suggest '-U' alone.
> 
> 20 lines are just enough to get all.  You can see this because there
> are less than 20 context lines at the beginning and end of the diff
> and only one hunk.  GNU diff doesn't allow -U without a line count.


Sorry -- I do not use the -U option and misread the diff(1) man page.


> Yes, the old Gigabyte mainboard has only 3 Gbps ports.  I wasn't aware
> of this but have just looked up the specs.


SATA2 should be plenty for Seagate ST2000DM001 drives.  Two PCIe x1 
SATA3 HBA's or one PCIe x2+ SATA3 HBA might improve performance slightly 
under specific workloads, but I would just stay with motherboard SATA2 
ports (unless you find problems with them).


> And the server is about 8 years old, initially with only 1 hard drive
> which crashed while my backup was too small to hold everything.  This
> meant a lot of work (and quite some money) to get everything running
> again and to recover data which wasn't in the backup.


I think we have all been burned by trying to "make do" with inadequate 
backup devices.  I threw money at the problem after my last significant 
data loss, and now have backups several drives deep.  The funny thing 
is: when you're prepared, the gremlins know it and stay away.  ;-)


>> The smartctl(8) RAW_VALUE column is tough to read.  Sometimes it looks
>> like an integer.  Other times, it looks like a bitmap or big-endian/
>> little-endian mix-up.  The VALUE column is easier.  Both 119 and 117
>> are greater than 100, so I would not worry.
> 
> Hm, in some cases the RAW_VALUE looked somehow "more readable, and the
> VALUE looked suspicous to me.  And here I found the explanation in the
> smartctl(8) man page:
> 
>          Each Attribute has a "Raw" value, printed under the heading
>          "RAW_VALUE", and a "Normalized" value printed under the
>          heading "VALUE".
>          [...]
>          Each vendor uses their own algorithm to convert this "Raw"
>          value to a "Normalized" value in the range from 1 to 254.
>          [...]
>          So to summarize: the Raw Attribute values are the ones that
>          might have a real physical interpretation, such as
>          "Temperature Celsius", "Hours", or "Start-Stop Cycles".


Thank you for the clarification.  As usual, I am guilty of inadequate 
RTFM...


> Thanks for all your answers, hints, suggestions.  With that, and
> reading the man page more carefully (mostly motivate by your and
> other's answers) I learned quite a lot new about SMART and how to
> use/read it.


YW.  I am learning too.


David

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Thread

RAID-1 and disk I/O Urs Thuermann <urs@isnogud.escape.de> - 2021-07-17 14:50 +0200
  Re: RAID-1 and disk I/O Nicholas Geovanis <nickgeovanis@gmail.com> - 2021-07-17 16:40 +0200
  Re: RAID-1 and disk I/O Bob Weber <bobrweber@gmail.com> - 2021-07-17 16:50 +0200
  Re: RAID-1 and disk I/O Andy Smith <andy@strugglers.net> - 2021-07-17 17:00 +0200
  Re: RAID-1 and disk I/O David Christensen <dpchrist@holgerdanske.com> - 2021-07-17 23:10 +0200
    Re: RAID-1 and disk I/O David <bouncingcats@gmail.com> - 2021-07-18 03:40 +0200
      Re: RAID-1 and disk I/O David Christensen <dpchrist@holgerdanske.com> - 2021-07-18 09:10 +0200
      Re: RAID-1 and disk I/O rhkramer@gmail.com - 2021-07-18 13:10 +0200
        Re: RAID-1 and disk I/O David <bouncingcats@gmail.com> - 2021-07-18 15:40 +0200
          Re: RAID-1 and disk I/O rhkramer@gmail.com - 2021-07-19 01:40 +0200
    Re: RAID-1 and disk I/O Reco <recoverym4n@enotuniq.net> - 2021-07-18 11:20 +0200
      Re: RAID-1 and disk I/O David Christensen <dpchrist@holgerdanske.com> - 2021-07-18 23:00 +0200
    Re: RAID-1 and disk I/O Urs Thuermann <urs@isnogud.escape.de> - 2021-07-18 23:40 +0200
      Re: RAID-1 and disk I/O David Christensen <dpchrist@holgerdanske.com> - 2021-07-19 00:50 +0200

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