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From: Kawaguti Ginga <ginga-freebsd@ginganet.org>
To: FreeBSD-users-jp@jp.FreeBSD.org
Message-ID: <20021231082901.GQ88868%ginga-freebsd@ginganet.org>
References: <20021128161901R.kgotoh@cic-kk.co.jp> <20021229205537K.kgotoh@cic-kk.co.jp>
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Date: Tue, 31 Dec 2002 17:29:01 +0900
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Subject: [FreeBSD-users-jp 72748] Re: RAID5 performance(software,hardware)
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$B@n8}$G$9(B

In Sun, Dec 29, 2002 at 08:55:37PM +0900,
Kazumasa Gotoh <kgotoh@cic-kk.co.jp> wrote:
>   Dell PowerEdge600SC
>     CPU Pentium4 1.8GHz, Memory 512MB, IDE RAID5 80DB x 4$BBf(B
> 
> $B%G%#%9%/$O8e=R$NHs(B RAID $B%^%7%s$HF1$8$@$H;W$o$l$^$9$N$G!"(B
> ad0: 76293MB <WDC WD800BB-18CAA0> [155009/16/63] at ata0-master BIOSDMA
> $B$3$N%G%#%9%/$G$7$g$&!#(B
$BN,(B
> Linux $BMQ$N%I%i%$%P$NJ}$,@-G=$,NI$$$N$G$7$g$&$+!)(B (^^;

Linux $B$N(B distribution $B$NB?$/(B($BA4$F(B?)$B$O%G%U%)%k%H$N%U%!%$%k%7%9%F%`$O(B
ext2 $B$r(B async mount $B$@$C$?$H;W$$$^$9$,!$>e5-$N$b$N$O(B
  * RAID card $BB&$N@_Dj(B($B$H$/$K(B cache $B<~$j(B)
  * OS $B$N@_Dj(B(file system $B$*$h$S=q$-9~$_$NF14|@_Dj(B)
$B$O$=$l$>$l$I$&$J$N$G$7$g$&(B?

# async mount $B$@$H!$A0$N%V%m%C%/$N=q$-9~$_$,=*N;$;$:$H$b(B
# $B%,%s%,%s<!$N%V%m%C%/$N=q$-9~$_L?Na$,Ht$s$G$/$k!$(B
# $B$H$$$&$h$&$J$3$H$@$C$?$j$9$k$N$+$J!$$H!%(B

$B;d$,(B 72349,72387,72501 $BJU$j$G;n$7$F$$$?$H$-$O(B
block size 64kB($B0lIt(B 128kB), direct I/O($B:G=i(B cached I/O), write through
$B$G$7$?!%$=$N8e!$0l1~(B UPS $BG[2<$J$N$G!$$H8@$$Lu$7$D$D!$(B
[64kB, cached I/O, write back($B$3$l$,Bg$-$$$H;W$o$l$^$9(B)] $B$K(B
$B$7$?$H$3$m!$(B15MB/s $BDxEY$N(B sequential write $BB.EY$,=P$^$7$?!%(B
soft update $B$J(B mount $B$r$7$F$$$^$9!%(B
(file system $B$N(B async mount $B$O;n$7$F$$$^$;$s!%(B)

$B$^$"!$$?$^$?$^(B "$B:GFb<~(B" "$B:G30<~(B" $B$KEv$?$C$?$H$+$=$&$$$&2DG=@-$b(B
$B$J$$$G$O$J$$$G$9$,!$$3$s$J:Y$+$$C10L$GA0$N%V%m%C%/$N=q$-9~$_=*N;$r(B
$BBT$C$F(B(write through)$B$+$i<!$N=q$-9~$_$r$7$F$$$?$i$$$D$^$G7P$C$F$b(B
$B=*$o$i$J$$$N$OF;M}$+$J!$$H;W$C$F$$$^$9!%(B
$BB.EY$,$I$&$7$F$bI,MW$J>l9g$O(B write back cache $B$r;n$5$l$k$N$O(B
$BG!2?$G$7$g$&!%(B

> $B$3$N7k2L$@$1$+$i$G$O2?$H$b$$$($^$;$s$,!"(BCERC $B$r;H$C$?(B IDE RIAD5 $B$O(B
> FreeBSD $B$G$O$+$J$jCY$$$H$$$&;v$K$J$j$^$9$M!#(B

$B<+J,$G%M%?$r?6$C$F$*$$$F$J$s$J$s$G$9$,!$(B
RAID 5 $B$N=q$-9~$_$O0lHL$KCY$/!$FC$K(B sequential write $B$O(B
$BDK!9$7$$7k2L$,=P$k$b$N$i$7$$$N$G!$$3$s$J$b$N$J$N$G$O(B
$B$J$$$G$7$g$&$+!%(B

# random I/O $B$N(B "$B4J0W%Y%s%A%^!<%/(B" $B$r9T$C$F$$$J$$$N$G(B
# "$BAm9gNO(B" $B$N$[$I$OJ,$+$j$^$;$s$,(B
-- 
       $B"J"J(B
Zzz.. (- - )$B"^"^"=!A(B           $B@n8}(B $B6d2O(B
      ##############   ginga-freebsd@ginganet.org
