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Re: Deb10 installer can't install grub

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On Wed, Mar 03, 2021 at 05:16:14PM -0500, Felix Miata wrote:
> Andrei POPESCU composed on 2021-03-03 17:50 (UTC+0200):
> 
> > Felix Miata wrote:
> 
> >> To start with, RAID1 is marginally slower than ordinary filesystems on partitions.
> 
> > This is true for some workloads, for others it can be significantly 
> > faster.
> 
> > https://arstechnica.com/information-technology/2020/04/understanding-raid-how-performance-scales-from-one-disk-to-eight/
> 										
> [...] Do
> you know of, or can you provide a reference to, any way RAID1 performance can be
> better than single disk?

I can just provide a hint: when accessing mirrored disks, reading is
done whenever the first disk finishes; writing whenever both disks
are done. So reading is potentially faster, writing potentially
slower.

That's about latency. The throughput shouldn't change too much (unless
you're combining very different disks, but that'd be asking for it).

Compose this with several layers of buffering and I doubt you'll be
able to make out any significant difference though.

No experimental data to back this up, alas.

> Evolution as taught in public schools, like religion,
> 	is based on faith, not on science.

OK. Now all bets wrt RAID are off, anyway.

Cheers
 - t

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Deb10 installer can't install grub Dave Sherohman <dave@sherohman.org> - 2021-03-02 13:30 +0100
  Re: Deb10 installer can't install grub Dan Ritter <dsr@randomstring.org> - 2021-03-02 14:00 +0100
    Re: Deb10 installer can't install grub The Wanderer <wanderer@fastmail.fm> - 2021-03-02 14:30 +0100
      Re: Deb10 installer can't install grub Dan Ritter <dsr@randomstring.org> - 2021-03-02 16:00 +0100
        Re: Deb10 installer can't install grub The Wanderer <wanderer@fastmail.fm> - 2021-03-02 16:00 +0100
        Re: Deb10 installer can't install grub Charles Curley <charlescurley@charlescurley.com> - 2021-03-02 17:20 +0100
    Re: Deb10 installer can't install grub Dave Sherohman <dave@sherohman.org> - 2021-03-02 15:10 +0100
      Re: Deb10 installer can't install grub The Wanderer <wanderer@fastmail.fm> - 2021-03-02 15:20 +0100
        Re: Deb10 installer can't install grub The Wanderer <wanderer@fastmail.fm> - 2021-03-02 15:30 +0100
          Re: Deb10 installer can't install grub Dave Sherohman <dave@sherohman.org> - 2021-03-02 15:40 +0100
        Re: Deb10 installer can't install grub Dave Sherohman <dave@sherohman.org> - 2021-03-02 15:30 +0100
    Re: Deb10 installer can't install grub Felix Miata <mrmazda@earthlink.net> - 2021-03-02 20:10 +0100
      Re: Deb10 installer can't install grub Andrei POPESCU <andreimpopescu@gmail.com> - 2021-03-03 17:00 +0100
        Re: Deb10 installer can't install grub Felix Miata <mrmazda@earthlink.net> - 2021-03-03 23:20 +0100
          Re: Deb10 installer can't install grub Dan Ritter <dsr@randomstring.org> - 2021-03-03 23:50 +0100
            Re: Deb10 installer can't install grub <tomas@tuxteam.de> - 2021-03-04 10:10 +0100
              Re: Deb10 installer can't install grub Greg Wooledge <greg@wooledge.org> - 2021-03-04 14:20 +0100
                Re: Deb10 installer can't install grub <tomas@tuxteam.de> - 2021-03-04 14:30 +0100
                Re: Deb10 installer can't install grub Anssi Saari <as@sci.fi> - 2021-03-05 10:30 +0100
                Re: Deb10 installer can't install grub Darac Marjal <mailinglist@darac.org.uk> - 2021-03-05 11:10 +0100
                Re: Deb10 installer can't install grub Andy Smith <andy@strugglers.net> - 2021-03-05 13:00 +0100
          Re: Deb10 installer can't install grub <tomas@tuxteam.de> - 2021-03-04 10:10 +0100
          Re: Deb10 installer can't install grub Andrei POPESCU <andreimpopescu@gmail.com> - 2021-03-05 14:50 +0100
  Re: Deb10 installer can't install grub "Andrew M.A. Cater" <amacater@einval.com> - 2021-03-02 22:00 +0100
  Re: Deb10 installer can't install grub Dave Sherohman <dave@sherohman.org> - 2021-03-03 10:00 +0100
    SOLVED - Re: Deb10 installer can't install grub Dave Sherohman <dave@sherohman.org> - 2021-03-03 12:30 +0100
      Re: SOLVED - Re: Deb10 installer can't install grub Marc Auslander <marcausl@gmail.com> - 2021-03-03 16:50 +0100
        Re: SOLVED - Re: Deb10 installer can't install grub Dave Sherohman <dave@sherohman.org> - 2021-03-07 14:10 +0100
          Re: SOLVED - Re: Deb10 installer can't install grub Nicholas Geovanis <nickgeovanis@gmail.com> - 2021-03-07 15:10 +0100
    Re: Deb10 installer can't install grub Anssi Saari <as@sci.fi> - 2021-03-04 10:10 +0100

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