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Date: Mon, 10 Jun 2002 18:14:59 +0900
From: Koji Uchiyama <uchiyama@pp.iij4u.or.jp>
To: FreeBSD-users-jp@jp.FreeBSD.org
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On Mon, 10 Jun 2002 16:44:19 +0900
I wrote:

> > $B$3$3$N!V;v8NN(!W$C$F$J$s$G$7$g$&$+(B?
> > # $B$C$F$$$&$+(B, $B;v8N$,B?$/$J$k$/$;$K2DMQ@-$,9b$/$J$k$C$F$N$,M}2r$G(B
> > # $B$-$J$$(B.
> 
> $B$$$o$f$k(B RAS(RASIS) $B$K$*$$$F(B
> 
>     Reliability $B?.Mj@-$N;XI8$K$O(B
>     $BJ?6Q8N>c4V3V(B MTBF ($B$^$?$O8N>cN((B = 1/MTBF) $B$rMQ$$$k(B
> 
>     Availability $B2DMQ@-$N;XI8$K$O(B
>     $B2TF/N((B = MTBF/(MTBF+MTTR) $B$rMQ$$$k(B
> 
>     Serviceability $BJ]<i@-$N;XI8$K$O(B
>     $BJ?6Q=$M};~4V(B MTTR ($B$^$?$O=$M}N((B 1/MTTR) $B$rMQ$$$k(B
> 
> $B$H;W$$$^$9$,!"(B
> 
>     $B;v8N(B($B8N>c(B)$B$,B?$$(B (MTBF $B$,C;$/$J$k(B) $B$G$"$C$F$b(B
>     $B$8$e$&$V$s$9$P$d$/=$M}$G$-$k(B (MTTR $B$,C;$/$J$k(B) $B$N$J$i(B
>     $B2TF/N($r9b$/$9$k$3$H$,$G$-$k(B
> 
> $B$H$$$&$3$H$G$O$J$$$G$7$g$&$+!)(B

$B$H=q$$$F$_$?$1$I!"(B
RAID $B$d(B root/toor $B$N@bL@$H$7$F$OITE,@Z$@$C$?$N$GD{@5$7$^$9!#(B

$B$?$H$($P2TF/N((B A1, A2 $B$N%5%V%f%K%C%H$rJBNs@\B3$G>iD92=$7$?>l9g!"(B
$B!V2DMQ@-$,9b$/$J$k!W$H$$$&$N$O(B

    $B!V%7%9%F%`A4BN$N2TF/N(!W(B1-(1-A1)*(1-A2) $B$O(B
    $B3F%5%V%f%K%C%H$N2TF/N((B A1 $B$d(B A2 $B$h$j$bBg$-$$(B

$B$H$$$&$3$H$G!"(B
$B!V;v8N$,B?$/$J$k!W$H$$$&$N$O(B

    $B!VA4%5%V%f%K%C%H$,2TF0$7$F$$$k3NN(!W(BA1*A2 $B$O(B
    $B3F%5%V%f%K%C%H$N2TF/N((B A1 $B$d(B A2 $B$h$j$b>.$5$$(B

$B$H$$$&$3$H$@$H;W$$$^$9!#(B

--
Koji Uchiyama <uchiyama@pp.iij4u.or.jp>

