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Re: RAID-1 and disk I/O

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On 7/18/21 2:16 AM, Reco wrote:
> 	Hi.
> 
> On Sat, Jul 17, 2021 at 02:03:15PM -0700, David Christensen wrote:
>>> But much more noticable is the difference of data reads of the two
>>> disks, i.e. 55 GB and 27 GB, i.e. roughly twice as much data is read
>>> from /dev/sdb compared to /dev/sda.  Trying to figure out the reason
>>> for this, dmesg didn't give me anything
>>
>> Getting meaningful information from system monitoring tools is
>> non-trivial.  Perhaps 'iostat 600' concurrent with a run of bonnie++.
>> Or, 'iostat 3600 24' during normal operations.  Or, 'iostat' dumped to
>> a time-stamped output file run once an hour by a cron job.
> 
> iostat belongs to sysstat package.
> sysstat provides sar, which, by default, gathers every detail of the
> host resource utilization and a little more once per 10 minutes.
> 
> There's little need for the kludges you're describing for one can simply
> invoke "sar -pd -f /var/log/sysstat/sa...".
> 
> Reco


Yes, sar(1) looks useful.  :-)


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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