Re: RAID Sizes (was Re: Why do people in the UK put a u in the word color?)
On Thu, Apr 13, 2006 at 09:18:17AM -0400, Matthias Julius wrote:
> > On Wed, 2006-04-12 at 12:32 -0400, Matthias Julius wrote:
> >>
> >> Yes, there is. As example here is part of the output of mdadm:
> >>
> >> Array Size : 468872448 (447.15 GiB 480.13 GB)
> >> Device Size : 156290816 (149.05 GiB 160.04 GB)
> >> ^^^ ^^
> >>
> >> Note there is GiB (gibibyte) which is 1024 MiB (mebibyte) and there is
> >> GB (gigabyte) which is 1000 MB (megabyte).
> >
> > If GB is decimal, then why aren't the sizes
> > 468.87 GB
> > 156.29 GB
>
> Why should they be?
Because dividing by a multpile of 10 essentially simply moves the
decimal point to the left. The thing that's not bleedingly obvious
there though is that 156290816 is in kibibytes. :) So:
156290816 * 1024 / 1000 / 1000 / 1000 ~= 160.04 GB :)
Similar for 468872448.
--
"To the extent that we overreact, we proffer the terrorists the
greatest tribute."
- High Court Judge Michael Kirby
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