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From: Kawaguti Ginga <ginga-freebsd@ginganet.org>
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References: <20021128161901R.kgotoh@cic-kk.co.jp> <20021128221458E.kgotoh@cic-kk.co.jp> <3DE6371B.1070308@honsha.meidensha.co.jp> <20021128161901R.kgotoh@cic-kk.co.jp> <20021128221458E.kgotoh@cic-kk.co.jp> <20021127024952.GC75858%ginga-freebsd@ginganet.org> <20021128161901R.kgotoh@cic-kk.co.jp> <20021127024952.GC75858%ginga-freebsd@ginganet.org> <20021129032319.GA88868%ginga-freebsd@ginganet.org> <200211290943.gAT9hpAg009529@fcomp.fuchu.toshiba.co.jp>
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Date: Sun, 8 Dec 2002 23:56:38 +0900
X-Sequence: FreeBSD-users-jp 72501
Subject: [FreeBSD-users-jp 72501] Re: RAID5 performance(software,hardware)
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X-Distribute: distribute version 2.1 (Alpha) patchlevel 24e+021208

$B@n8}(B@$B@$EDC+$G$9(B($B$HL>>h$C$?J}$,NI$$$N$+$J(B)

$BBgJ,;~4V$,7P$C$F$7$^$$$^$7$?$,(B...

In Fri, Nov 29, 2002 at 06:43:52PM +0900,
"FUJII, Satoshi" <satoshi.fujii@toshiba.co.jp> wrote:
> >> # 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

$B%3%a%s%H$"$j$,$H$&$4$6$$$^$9!%(B
$B$=$&$+!$(Bconsistency $B$r5?$o$J$1$l$P(B
$BA4(B disk $B$rFI$^$J$/$F$bNI$$$N$G$9$M!%(B
($B$G!$Bf?t$,B?$$$H$-$K$O$&$^$/$9$l$P(B write $B$bJBNs$K$G$-$k(B
$B%A%c%s%9$,>/$7$O$"$k!$$H$$$&$3$H$G$9$M(B)

$B$=$l$K$7$F$b!$$J$s$G<j85$N(B MegaRAID i4 $B$O$3$s$J$KCY$$$s$@$m$&(B...
$B$^!$(Bsequential write $B<+BN$N@-G=$J$s$F$I$&$G$b$$$$$s$G$9$,!$(B
newfs $B$b?t;~4V$8$c:Q$^$J$$$/$i$$$+$+$k$7!$A4BN$K(B
$BCY$$$N$O$?$7$+$J$s$G$9$h$M!%(B

$B$A$J$_$K!$(Bvinum $B;n$7$?$"$H$^$?(B MegaRAID i4 $B<+?H$K$h$k(B RAID(amrd0)
$B$KLa$7!$A02s$H%Q%i%a!<%?$r>/$7JQ$((B(block size 64kB, direct I/O;
$B$$$:$l$b%G%U%)%k%HCM(B)$B!$;n$7$F$_$^$7$?$,!$(B
$B$d$O$j(B sequential write 3.8MB/s, read 50MB/s $B$/$i$$$G$7$?!%(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

$B=q$-9~$_B&$N(B cache $B$O!$$A$g$C$HI]$/$F(B write through ($B%G%U%)%k%H(B)$B$K(B
$B@_Dj$7$F$$$k$N$G$9$,!$(Bwrite back $B$r;n$9$Y$-$J$N$G$7$g$&$M!%(B
$B0l1~(B UPS $BG[2<$K$O$"$k$7!$$=$s$J$K(B disastrous $B$J$3$H$K$O(B
$B$J$i$J$$$G$7$g$&(B...($B$G$b@hF|%a%b%j%(%i!<$H$+$G%H%i%V$C$?(B...)
-- 
       $B"J"J(B
Zzz.. (- - )$B"^"^"=!A(B           $B@n8}(B $B6d2O(B
      ##############   ginga-freebsd@ginganet.org
