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Date: Fri, 29 Nov 2002 18:43:52 +0900
X-Sequence: FreeBSD-users-jp 72396
Subject: [FreeBSD-users-jp 72396] Re: RAID5 performance(software,hardware)
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X-Distribute: distribute version 2.1 (Alpha) patchlevel 24e+021111

$BF#0f$G$9!#(B

Kawaguti Ginga $B$5$s$O(B
Message-ID: <20021129032319.GA88868%ginga-freebsd@ginganet.org>
Subject: [FreeBSD-users-jp 72387] Re: RAID5 performance(software,hardware) $B$G=q$-$^$7$?!#(B

FreeBSD$B$G(BRAID 5$B$r;HMQ$7$?$3$H$,$J$$$N$G!J7P83>e$N!K0lHLE*$JOC$G$9(B
$B$H$J$j$^$9$,!#(B

>$BJL%a!<%k$K$F(B
>> # 6$BBf9=@.$H(B 3$BBf9=@.$@$H!"(B6$BBf9=@.$NJ}$,B.EYE*$K$OITMx$K$J$k$N$+$J!)(B
>$B$H=q$+$l$F$$$^$9$,!$(BRAID5 $B$N>l9g$O(B read $B$OBf?t$,A}$($l$P(B
>striping $B$HF1MM$K%Q%U%)!<%^%s%9$,8~>e$9$k$O$:$G$9$,!$(Bwrite $B$O(B
>  * $B$*L\Ev$F$N(B disk $B$K=q$/(B
>  * $BA4It(B-2$B$N(B disk $B$NBP1~$9$k(B block $B$rFI$`(B 
>  * parity $B$r7W;;(B
>  * parity $B$r=q$-9~$`(B

RAID 5$B$N=hM}$O(B

* $B$*L\Ev$F$N(B disk $B$rFI$`(B
* $BBP1~$9$k(B parity block $B$rFI$`(B 
* $B$3$N(B 2$B$D$H?7%G!<%?$G(B parity $B$r7W;;!J(BXOR$B$G(B 2$B%9%F%C%W$+$1$F!K(B
* parity $B$r=q$-9~$`(B
* data $B$r=q$-9~$`(B

$B$N(B2read$B!$(B2write$B$H;W$$$^$9!J(Bwrite$B%Z%J%k%F%#!K!#(B

>$B$H$$$&:n6H$,$"$k$O$:$J$N$G!$Bf?t$,A}$($k$[$ICY$/$J$k!$(B
>$B$H$$$&$3$H$G$9$+$M(B... ($B2<<j$9$k$H(B1$B$D$E$DFI$s$G$$$?$j$7$F(B...)

$B$=$s$J$3$H$O$J$$;W$$$^$9$,!#(B

$BBf?t$,A}$($k$HCY$/$J$k$N$O=LB`%b!<%I;~!J%G%#%9%/(B1$BBf8N>c;~!K$NFI$_(B
$B=P$7$@$H;W$$$^$9!#(B

$B=q$-9~$_%5%$%:!$%9%H%i%$%W%5%$%:!$%+%i%`?t$GD4@0$9$k$3$H$G!$Bf?tA}(B
$B2C$K$h$k@-G=8~>e$O$=$l$J$j$K4|BT$G$-$k$H;W$$$^$9!#(B

$BK\%9%l%C%I$N@=IJ$O8+$?$3$H$b$J$$$G$9$,!$@-G=:9$O%i%$%H%-%c%C%7%eNL(B
$B$d%-%c%C%7%e=hM}$N%"%k%4%j%:%`!J=q$-9~$_$r9)IW$7$^$9!K$,M%=($J$I$K(B
$B$h$k$N$G$O$J$$$G$7$g$&$+!)(B

$B!t;W$$$C$-$j$O$:$7$F$$$k$+$b$7$l$^$;$s!#(B

-- 
$BF#0f(B
satoshi.fujii@toshiba.co.jp
