Date: Thu, 19 Apr 2001 15:26:32 -0700 From: Darryl Okahata <darrylo@soco.agilent.com> To: Warner Losh <imp@harmony.village.org> Cc: freebsd-small@FreeBSD.ORG Subject: Re: The ultimate board! Message-ID: <200104192226.PAA21832@mina.soco.agilent.com> In-Reply-To: Your message of "Thu, 19 Apr 2001 10:58:50 MDT." <200104191658.f3JGwo804947@harmony.village.org>
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Warner Losh <imp@harmony.village.org> wrote:
> Based on 10e5 writes per block, 8k blocks and 5M of available space, 1
> write per second is about 723 days, assuming even wear on each of the
> available blocks (unless I've messed up my calculations). That puts
> it at two years. one write per minute would be 120 years and one
> write per hour would be 7200 years.
... but, you can't assume even wear. Don't directory entries,
etc., get written in the same place, over and over? What about
superblocks?
Still, even if you assume 2 writes a minute (once every 30
seconds???) to the same block, over and over, it's still over two years
(1e5 writes -- I'm assuming that you mean "100000" for "10e5", and not
"1000000").
[ Of course, if one were to write a new/special filesystem that ensured
even wear, that would work well for CF .... ]
--
Darryl Okahata
darrylo@soco.agilent.com
DISCLAIMER: this message is the author's personal opinion and does not
constitute the support, opinion, or policy of Agilent Technologies, or
of the little green men that have been following him all day.
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