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<H2><A NAME="technologies"></A> <A NAME="s6">6. $B%G%#%9%/4XO"5;=Q(B</A></H2>
<P>
<!--
disk!technologies
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$B<j;}$A$N%G%P%$%9$r:GBg8BMxMQ$9$k$K$O$I$&$9$l$P$h$$$+$rH=CG$9$k$K$O!"(B
$B$I$s$J5;=Q$,8=:_MxMQ2DG=$G!"(B
$B$=$l$i$O$I$N$h$&$J$b$N$J$N$+$rCN$kI,MW$,$"$j$^$9!#(B
$B$$$D$b$N$3$H$J$,$iB.EY$d?.Mj@-!"G=NO!"=@Fp$5!";H$$0W$5!"J#;($5$J$I$J$I!"(B
$B0lD90lC;$,$"$j$^$9!#(B
<P>$B0J2<$K5-=R$5$l$F$$$k5;=Q$rAH$_9g$o$;$kJ}K!$b?tB?$/$"$j!"(B
$B@-G=$d?.Mj@-$r8~>e$5$;$k$3$H$,$G$-$^$9!#(B
$B$?$@$7J#;($K$J$k$H$$$&Be2A$bEvA3@8$8$^$9$,!#(B
<P>
<H2><A NAME="RAID"></A> <A NAME="ss6.1">6.1 RAID</A>
</H2>
<P>
<!--
disk!technologies!RAID
-->
$B$3$NJ}K!$O!"J#?t$N%G%#%9%/$rJBNs$K;H$&$3$H$K$h$C$F(B
$B%"%/%;%9;~4V$d%G!<%?E>AwB.EY$r8~>e$5$;!"(B
$B%G%#%9%/%7%9%F%`$N?.Mj@-$HB.EY$H$r9b$a$h$&$H$$$&$b$N$G$9!#(B
$B%A%'%C%/%5%`$d%_%i!<%j%s%0$,?.Mj@-8~>e$N<jK!$H$7$FMQ$$$i$l$F$$$^$9!#(B
$BBg$-$J%5!<%P$G$OM-8z$JJ}K!$G$9$,!"(B
$B%7%s%0%k%f!<%6$N%7%9%F%`$K$O2a>j$J5!G=$G$7$g$&!#(B
$B4{$K$?$/$5$s$N%G%#%9%/$,$"$k$h$&$J>l9g$K$O9MN8$7$F$bNI$$$+$b$7$l$^$;$s!#(B
$BB>$NJ8=q$d(B FAQ $B$J$I$b8+$F$/$@$5$$!#(B
<P>Linux $B$G(B RAID $B$r<B8=$9$k$K$O!"(B
$B%+!<%M%k$N(B md $B%b%8%e!<%k$r;H$C$F%=%U%HE*$K9T$J$&J}K!!"(B
Linux $B$G%5%]!<%H$5$l$F$$$k%3%s%H%m!<%i(B (PCI-to-SCSI) $B$r;H$C$F(B
$B%O!<%I%&%'%"E*$K9T$J$&J}K!!"(B
SCSI-to-SCSI $B$N%3%s%H%m!<%i$r;H$&J}K!$N;0$D$,$"$j$^$9!#(B
$B%O!<%IE*$JJ}K!$N$[$&$,9bB.$G$9$7!"(B
$B$*$=$i$/0BA4$G$b$"$k$G$7$g$&!#$7$+$7$*6b$b$+$+$j$^$9!#(B
<P>Linux $B$GMxMQ$G$-$k%O!<%I%&%'%"(B RAID $B$K4X$9$k$^$H$a$O(B
<A HREF="http://www.Linux-Consulting.com/Raid/Docs/raid_hw.txt">Linux Consulting</A>
$B$G8+$k$3$H$,$G$-$^$9!#(B
<P>
<H3><A NAME="SCSI-to-SCSI"></A> SCSI-to-SCSI</H3>
<P>
<!--
disk!technologies!RAID!SCSI-to-SCSI
-->
SCSI-to-SCSI $B$N%3%s%H%m!<%i$O!"(B
$BDL>o0l$D$N%-%c%S%M%C%H$K%I%i%$%V$H0l=o$K<}$a$i$l$F$*$j!"(B
$B%3%s%H%m!<%i$N$b$&JRJ}$N(B SCSI $B%P%9$G%3%s%T%e!<%?$K7R$0$h$&$K$J$C$F$$$^$9!#(B
$B$D$^$j%-%c%S%M%C%HA4BN$,!"Bg$-$/9bB.$J0l$D$N(B SCSI $B%I%i%$%V$H$7$F8+$(!"(B
$BFCJL$J(B RAID $B%I%i%$%P$OI,MW$H$7$J$$$N$G$9!#(B
$B7gE@$H$7$F$O!"%-%c%S%M%C%H$H%3%s%H%m!<%i$r7R$0(B
SCSI $B%P%9$,%\%H%k%M%C%/$K$J$k$3$H$,5s$2$i$l$^$9!#(B
<P>$B5pBg$J%G%#%9%/%U%!!<%`$r:n$k?M$?$A$K$H$C$F$NBg$-$JLdBj$O!"(B
<A HREF="file:///dev/">/dev</A>
$B%G%#%l%/%H%j$KCV$+$l$k(B SCSI $B%I%i%$%V$N%(%s%H%j$K$O@)8B$,$"$k$H$$$&$3$H$G$9!#(B
$B$3$N$h$&$J>l9g(B SCSI-to-SCSI $B$r;H$($P%(%s%H%j$r$"$^$j>CHq$7$J$$$G$9$_$^$9!#(B
<P>$BDL>o$O%U%m%s%H%Q%M%k$+$i!"(B
$B$"$k$$$O%*%s%\!<%I$N%7%j%"%k%$%s%?!<%U%'!<%9$K@\B3$7$?C<Kv$+$i(B
$B@_Dj$,9T$($k$h$&$K$J$C$F$$$^$9!#(B
<P>$B$3$N$h$&$J%7%9%F%`$r:n$C$F$$$k%a!<%+$H$7$F$O(B
<A HREF="http://www.cmd.com">CMD</A> $B$d(B
<A HREF="http://www.syred.com">Syred</A>
$B$J$I$,$"$j$^$9!#(B web $B%Z!<%8$K$$$/$D$+$N%7%9%F%`$K4X$9$k@bL@$,$"$j$^$9!#(B
<P>
<P>
<H3><A NAME="PCI-to-SCSI"></A> PCI-to-SCSI</H3>
<P>
<!--
disk!technologies!RAID!PCI-to-SCSI
-->
PCI-to-SCSI $B%3%s%H%m!<%i$O!"L>A0$+$i$b$o$+$kDL$j9bB.$J(B PCI $B%P%9$r;H$&$N$G!"(B
SCSI-to-SCSI $B$N$h$&$J%\%H%k%M%C%/$KG:$^$5$l$:$K$9$_$^$9!#(B
$B$3$l$i$N%3%s%H%m!<%i$K$OFC<l$J%I%i%$%P$,I,MW$G$9$,!"(B
RAID $B$N@_Dj$r%M%C%H%o!<%/1[$7$K9T$&$h$&$J<jCJ$b$"$k$N$G!"(B
$B4IM}$OC1=c2=$G$-$^$9!#(B
<P>Linux $B$G%5%]!<%H$5$l$F$$$k(B PCI-to-SCSI $B%[%9%H%"%@%W%?$N@=IJ%i%$%s%"%C%W$O!"(B
$B8=:_$O$^$@$"$^$j$?$/$5$s$O$"$j$^$;$s!#(B
<P>
<DL>
<P>
<DT><B>DPT</B><DD><P>$B$b$C$H$bNr;K$,$"$j!"$^$?$b$C$H$b%i%$%s%"%C%W$N=<<B$7$?%3%s%H%m!<%i$O(B
<A HREF="http://www.dpt.com">DPT</A>
$B$+$iF~<j$G$-$^$9!#(B SmartCache I/III/IV $B$H(B SmartRAID I/III/IV
$B%3%s%H%m!<%i$N%U%!%_%j$,$"$j$^$9!#(B
$B$3$l$i$N%3%s%H%m!<%i$O!"(B
$BI8=`%+!<%M%k$N(B EATA-DMA $B%I%i%$%P$G%5%]!<%H$5$l$F$$$^$9!#(B
<A HREF="http://www.dpt.com/">DPT $B$N%[!<%`%Z!<%8(B</A>
$B$K$bM-1W$J>pJs$,$"$j$^$9!#@=IJ$N>pJs$@$1$G$J$/!"(B
RAID $B$d(B SCSI $B$K4X$9$k0lHLE*$J2r@b$bFI$`$3$H$,$G$-$^$9!#(B
<P>DPT $B%3%s%H%m!<%iMQ%I%i%$%P(B (EATA* $B%I%i%$%P(B) $B$NCx<T$,=q$$$?%Z!<%8$K$O(B
<A HREF="http://www.uni-mainz.de/~neuffer/scsi/">SCSI</A>
$B$H(B
<A HREF="http://www.uni-mainz.de/~neuffer/scsi/dpt/">DPT</A>
$B$K4X$9$k$h$j>\:Y$J>pJs$,$"$j$^$9!#(B
<P>DPT $B$N%3%s%H%m!<%i$O:GB.$H$$$&$o$1$G$O$"$j$^$;$s$,!"(B
$BD9$/;H$o$l$F$*$j!"$=$N?.Mj@-$O>ZL@:Q$_$G$9!#(B
<P>DPT $B%3%s%H%m!<%i$N%a%s%F%J%s%9%D!<%k$O!"8=:_$N$H$3$m(B
DOS/Win $B$G$7$+F0:n$7$^$;$s!#(B
$B$7$?$,$C$F>.$5$J(B DOS/Win $B$N%Q!<%F%#%7%g%s$r:n$C$F!"(B
$B$$$/$D$+%=%U%H$rF~$l$F$*$/I,MW$,$"$j$^$9!#(B
$B$^$?$3$N(B RAID $B%7%9%F%`$r4IM}$9$k$K$O!"(B
$B%7%9%F%`$r(B Windows $B$G%V!<%H$7$J$1$l$P$J$i$J$$$o$1$G$9!#(B
<P>
<DT><B>ICP-Vortex</B><DD><P>$B$4$/:G6aDI2C$5$l$?%3%s%H%m!<%i$N%7%j!<%:$G!">pJs$O(B
<A HREF="http://www.icp-vortex.com">ICP-Vortex</A>
$B$K$"$j$^$9!#8^$D$NFHN)$7$?%A%c%s%M%k$r$b$A!"(B
i960 $B%A%C%W$rMQ$$$?Hs>o$K9bB.$J%O!<%I%&%'%"$K$J$C$F$$$^$9!#(B
Linux $B$N%I%i%$%P$O%a!<%+<+?H$K$h$C$F=q$+$l$F$*$j!"(B
$B$b$A$m$s(B Linux $B$r%5%]!<%H$9$k$3$H$bI=L@$5$l$F$$$^$9!#(B
<P>ICP-Vortex $B$O(B Linux $BMQ$N%a%s%F%J%s%9%=%U%H%&%'%"$r6!5k$7$F$*$j!"(B
RAID $B%7%9%F%`$N@_Dj$d4IM}$KB>$N(B OS $B$G:F5/F0$9$kI,MW$O$"$j$^$;$s!#(B
$B$7$?$,$C$F%@%&%s%?%$%`$,>/$J$/$F:Q$_$^$9!#(B
<P>
<DT><B>Mylex DAC-960</B><DD><P>$B$D$$:G6aDI2C$5$l$?$b$N$G!"8=:_%Y!<%?HG$N=i4|CJ3,$G$9!#(B
$B>\:Y$J>pJs$d%I%i%$%P$O(B
<A HREF="http://www.dandelion.com/Linux/DAC960.html">Dandelion Digital's Linux DAC960 Page</A>.
$B$+$iF~<j$7$F$/$@$5$$!#(B
<P>
<DT><B>Compaq Smart-2 PCI Disk Array Controllers</B><DD><P>$B$3$l$b$4$/$4$/:G6aDI2C$5$l$?$b$N$G!"8=:_(B
<A HREF="http://www.insync.net/~frantze/cpqarray.html">Smart-2</A>
$BMQ$N%I%i%$%P$O%Y!<%?%j%j!<%9$NCJ3,$G$9!#(B
<P>
<DT><B>IBM ServeRAID</B><DD><P>IBM $B$OH`$i$N(B
<A HREF="http://www.developer.ibm.com/welcome/netfinity/serveraid_beta.html">$B%I%i%$%P(B</A>
$B$r(B GPL $B$G8x3+$7$F$$$^$9!#(B
<P>
</DL>
<P>
<P>
<H3>$B%=%U%H%&%'%"(B RAID</H3>
<P>
<!--
disk!technologies!RAID!Software RAID
-->
<P>$BIaDL$N%G%#%9%/$H%3%s%H%m!<%i$r;H$C$F%=%U%H%&%'%"$G(B RAID $B$r<B8=$9$k<jK!$O(B
$BB?$/$N(B OS $B$G2DG=$G$9!#2A3J%3%9%H$ODc$/!"(B
raw $B%G%#%9%/(B I/O $B$rHs>o$K9bB.$K$G$-$^$9!#(B
$B$3$l$O(B CPU $B$K$+$+$kIi2Y$,6K$a$FBg$-$$$N$G!"(B
$BF3F~$7$h$&$H$7$F$$$k%^%7%s$N@)8B$,(B I/O $B$G$O$J$/(B CPU $B$K$"$k>l9g$O!"(B
$B8e=R$9$k%O!<%I%&%'%"E*$J(B PCI-to-RAID $B%3%s%H%m!<%i$rMxMQ$9$k$N$,NI$$$G$7$g$&!#(B
<P>$B%=%U%H%&%'%"(B RAID $B$H%O!<%I%&%'%"(B RAID $B$H$N(B
$BF3F~%3%9%H!"@-G=!"$=$7$FFC$K?.Mj@-$K4X$9$kHf3S$O!"(B
$BHs>o$K8E$/$+$iB3$$$F$$$kOCBj$G$9!#(B
Linux $B$N?.Mj@-$K4X$7$F$O!"8=:_$G$OHs>o$KM%$l$F$$$k$H$5$l$F$$$^$9!#(B
<P>Linux $B$K$*$1$k8=:_$N(B $B%=%U%H%&%'%"(B RAID $B%W%m%8%'%/%H$O(B
<CODE>md</CODE> (multiple devices) $B$G$9!#(B
$B$3$l$O(B RAID $B0J30$N5!G=$b$?$/$5$sHw$($F$$$k$N$G!"(B
$B8e$[$I$h$j>\$7$/>R2p$7$^$9!#(B
<P>
<P>
<H3><A NAME="raid-levels"></A> RAID $B$N%l%Y%k(B</H3>
<P>
<!--
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-->
RAID $B$K$O2?CJ3,$+$N%l%Y%k$,$"$j!"$=$l$>$l0[$J$C$?5!G=$r;}$C$F$$$^$9!#(B
$B$3$3$G$O$3$l$i$NFbMF$K$D$$$F4JC1$K@bL@$7$^$9!#(B
<A HREF="http://ostenfeld.dk/~jakob/Software-RAID.HOWTO/">Software RAID HOWTO</A>
$B$K$O$b$C$H$:$C$H>\:Y$J>pJs$,$"$j$^$9!#(B
RAID $B$K6=L#$r;}$?$l$?J}$O;29M$K$7$F$/$@$5$$!#(B
<P>
<UL>
<LI>RAID <EM>0</EM> $B$O%G!<%?$N>iD9@-$rA4$/;}$A$^$;$s!#(B
$B$7$+$7F~=PNO$N%9%k!<%W%C%H$O:G9b$G$9!#(B
$B$=$l$>$l$N%G!<%?$OJ#?t$N%I%i%$%V$KJ,3d$7$F=q$-9~$^$l$k(B
($B%9%H%i%$%T%s%0$H$$$$$^$9(B) $B$N$G!"(B
read/write $B$,JB9T$7$FF1;~$K9T$o$l$^$9!#(B
$B$=$NBe$o$j!"(B
$B$R$H$D$N%I%i%$%V$@$1$G$b2u$l$F$7$^$&$H$9$Y$F$N%G!<%?$,<:$o$l$^$9!#(B
$B%P%C%/%"%C%W$N$3$H$O$b$&8@$$$^$7$?$h$M!)(B
</LI>
<LI>RAID <EM>1</EM> $B$O%G!<%?$N>iD9@-$r(B
$B$b$C$H$b86;OE*$J<jK!$G<B8=$7$F$$$^$9!#(B
$B$9$Y$F$N%I%i%$%V$N%G!<%?$r(B 2 $B=E2=$7$F$$$k$N$G$9!#(B
$B$b$A$m$sMFNL$NE@$G$OHs>o$KB;$J$N$G$9$,!"(B
$B%"%/%;%9B.EY$NE@$+$i$OB?>/$NMxE@$,$"$j$^$9!#(B
$B%G!<%?$r%"%/%;%9$9$k:]$K!"(B
$B@h$K%7!<%/F0:n$r40N;$7$?%I%i%$%V$+$i%G!<%?$,FI$_<h$i$l$k$+$i$G$9!#(B
$BE>AwB.EY$O%I%i%$%V$,0lBf$N;~$h$jB.$/$O$G$-$^$;$s!#(B
$B%I%i%$%V$=$l$>$l$+$i(B 1 $B%H%i%C%/$:$DFI$_9~$a$P!"(B
$BB?>/$OFI$_=P$7E>Aw$OB.$/$J$k$+$b$7$l$^$;$s$,!#(B
$B$b$7%I%i%$%V$,(B 2 $BBf$7$+$J$$>l9g$O!"(B
$B$3$NJ}K!$,%G!<%?>iD9@-$r;}$?$;$kM#0l$NJ}K!$H$J$j$^$9!#(B
</LI>
<LI>RAID <EM>2</EM> $B$H(B <EM>4</EM> $B$O$=$l$[$I0lHLE*$G$O$J$$$N$G!"(B
$B$3$3$G$O>JN,$7$^$9!#(B
</LI>
<LI>RAID <EM>3</EM> $B$O(B 2 $BBf0J>e$N%G%#%9%/$r;H$$!"(B
$B%G!<%?$r(B RAID 0 $B$N%9%H%i%$%T%s%0$N$h$&$J7A$G5-O?$7$^$9!#(B
$B$^$?>iD9@-$rJ];}$9$k%G%#%9%/(B (redundancy disk) $B$,DI2C$5$l$F$*$j!"(B
$B%G!<%?%G%#%9%/$+$i$N%G!<%?$N(B XOR sum $B$rJ];}$9$k$h$&$K$J$C$F$$$^$9!#(B
$B$b$7(B redundancy $B%G%#%9%/$,8N>c$7$F$b!"(B
$B%7%9%F%`$O2?;v$b$J$+$C$?$h$&$KF0:n$G$-$^$9!#(B
$B%G!<%?%G%#%9%/$N$I$l$+$R$H$D$,8N>c$7$F$b!"(B
$B$=$N>e$K$"$C$?%G!<%?$O;D$j$N%G!<%?%G%#%9%/$H(B
redundancy $B%G%#%9%/$N%G!<%?$H$+$i7W;;$G$-$^$9!#(B
$B$?$@$7F1;~$K$I$l$+(B 2 $BBf$N8N>c$,5/$-$?>l9g$O!"(B
RAID $B>e$N$9$Y$F$N%G!<%?$O<:$o$l$^$9!#(B
RAID 3 $B$O!">/$J$/$H$b(B 2 $BBf$N%G!<%?%G%#%9%/(B
(redundancy $B%G%#%9%/$rF~$l$k$H(B 3 $BBf$N%G%#%9%/(B)
$B$,$J$1$l$P0UL#$,$"$j$^$;$s!#(B
$BM}O@E*$K$OAH$K$G$-$k%G%#%9%/$NBf?t$K@)8B$O$"$j$^$;$s$,!"(B
$BBf?t$,A}$($k$H8N>c$N3NN($bA}2C$7$F$$$-$^$9!#(B
$BDL>o0l$D$N(B RAID $B%;%C%H$"$?$j$N%G%#%9%/Bf?t$O(B
5 $B$+$i(B 7 $BBfDxEY$K$J$C$F$$$k$3$H$,B?$$$G$7$g$&!#(B
RAID 3 $B$G>iD9@->pJs$NJ]B8$5$l$F$$$k%G%#%9%/$O$"$kFCDj$N$b$N$K$J$C$F$$$^$9!#(B
$B$3$N>pJs$O!"$I$3$+$N%G!<%?%G%#%9%/$K=q$-9~$_$,9T$o$l$k$?$S$K(B
$B99?7$7$J$1$l$P$J$j$^$;$s$+$i!"(B RAID 3 $B%;%C%H$N=q$-9~$_@-G=$O(B
redundancy $B%G%#%9%/$NB.EY$K$h$C$FN'B.$5$l$k$3$H$K$J$j$^$9!#(B
$B0lJ}(B RAID 3 $B$NFI$_9~$_@-G=$O!"(B
$B%G!<%?%G%#%9%/$NBf?t$HF1$8Bf?t9=@.$N(B RAID 0 $B$HEy$7$/$J$j$^$9!#(B
$B$I$l$+$N%G%#%9%/$,8N>c$7$F!"(B
$B$=$N%G%#%9%/$KJ]B8$5$l$F$$$?%G!<%?$r(B
$B>iD9@->pJs$+$i:F9=@.$7$J$1$l$P$J$i$J$$>l9g$O!"@-G=$OHs>o$KDc2<$7$^$9!#(B
$B$9$Y$F$N%G%#%9%/$GFI$_9~$_$r9T$$!"(B
XOR $B7W;;$r9T$C$F<:$o$l$?>pJs$r2sI|$7$J$1$l$P$J$i$J$$$+$i$G$9!#(B
</LI>
<LI>RAID <EM>5</EM> $B$O(B RAID 3 $B$H;w$F$$$^$9$,!"(B
$B>iD9>pJs$,(B RAID $B%;%C%H$N$9$Y$F$N%G%#%9%/$K>/$7$:$DJ]B8$5$l$F$$$^$9!#(B
$B$3$l$K$h$C$F=q$-9~$_@-G=$,8~>e$7$F$$$^$9!#(B
$BIi2Y$,$9$Y$F$N%G%#%9%/$KJ,;6$9$k$+$i$G$9!#(B
</LI>
</UL>
<P>RAID 0 $B$d(B 1 $B$rB>$N%l%Y%k$HAH$_9g$o$;$F;H$&$3$H$b$G$-$^$9!#(B
$BMM!9$JAH$_9g$o$;$,2DG=$J$O$:$G$9$,!";d$,8+$?$3$H$,$"$k$N$O(B 2$B!A(B3 $B<oN`$G$9!#(B
$B$3$l$i$O>e$K>R2p$7$?(B RAID $B$N3F%l%Y%k$h$j$b$:$C$HJ#;($J%7%9%F%`$K$J$j$^$9!#(B
<P>RAID <EM>0/1</EM> $B$O%9%H%i%$%T%s%0$HFs=E2=$rAH$_9g$o$;$?$b$N$G!"(B
$BHs>o$KB.$$E>AwB.EY$H%7!<%/B.EY!"$*$h$S%G!<%?>iD9@-$,F@$i$l$^$9!#(B
$B7gE@$O>CHq$9$k%G%#%9%/MFNL$,Bg$-$$$H$$$&E@$H!"(B
$B@hDx?($l$?$h$&$K%7%9%F%`$,J#;($K$J$C$F$7$^$&$H$$$&E@$G$9!#(B
<P>RAID <EM>1/5</EM> $B$NAH$_9g$o$;$O>iD9EY3NJ]$K$*$1$k(B RAID 5 $B$NM%0L@-$H(B
$B%7!<%/B.EY$K$*$1$k(B RAID 1 $B$NM%0L@-$rAH$_9g$o$;$?$b$N$G$9!#(B
$B>iD9@-$O(B RAID 0/1 $B$KHf$Y$F2~A1$5$l$^$9$,!"(B
$B$=$l$G$b%G%#%9%/>CHq$O$=$l$J$j$K$J$j$^$9!#(B
$B$3$N$h$&$J%7%9%F%`$ODL>o(B 6 $BBf0J>e$N%I%i%$%V$+$i9=@.$5$l$^$9!#(B
$BJ#?t$N%3%s%H%m!<%i$d(B SCSI $B%A%c%s%M%k$,MxMQ$5$l$k>l9g$b$"$k$G$7$g$&!#(B
<P>
<P>
<H2><A NAME="vol-mgmnt"></A> <A NAME="ss6.2">6.2 $B%\%j%e!<%`4IM}(B</A>
</H2>
<P>
<!--
disk!technologies!volume management
-->
$B%\%j%e!<%`4IM}(B (volume management) $B$O(B
$B%Q!<%F%#%7%g%s$d%G%#%9%/$NMFNL$,8GDj$5$l$F$$$k$3$H$K$h$k@)8B$r(B
($BB>$K;H$($k%U%!%$%kNN0h$,$"$k>l9g$K(B) $B$J$/$7$F$7$^$&$b$N$G$9!#(B
$B?7$7$$%G%#%9%/$r%7%9%F%`$KDI2C$9$l$P!"(B
$B$3$N%I%i%$%V$NNN0h$r%U%!%$%k%7%9%F%`$N9%$-$JItJ,$KDI2C$G$-$k$N$G$9!#(B
$B$^$?2u$l$+$1$F$$$k%G%#%9%/$+$i%G!<%?$rJL$N%I%i%$%V$K0\$7$F!"(B
$B:R32$rHr$1$?$j$9$k$3$H$b$G$-$^$9!#(B
<P>
<A HREF="http://www.veritas.com">Veritas</A>
$B$K$h$C$F3+H/$5$l$?%7%9%F%`$,(B logical $B%\%j%e!<%`4IM}%7%9%F%`$N(B
$B%G%U%!%/%H%9%?%s%@!<%I$K$J$C$F$$$k$h$&$G$9!#(B
<P>$B8=:_$N$H$3$m$G$O!"(B Linux $B$K$O%\%j%e!<%`4IM}$NJ,Ln$O7g$1$F$$$^$9!#(B
<P>$B2>A[%Q!<%F%#%7%g%s%7%9%F%`(B (Virtual Partition System) $B%W%m%8%'%/%H$G$"$k(B
<A HREF="http://www-wsg.cso.uiuc.edu/~roth/">VPS</A>
$B$O!"(B
IBM $B$N(B AIX $B%7%9%F%`$K$"$k%\%j%e!<%`4IM}5!G=$NB?$/$r:F<BAu$7$h$&$H$$$&$b$N$G$9!#(B
$B$7$+$7;DG0$J$,$i$3$N%W%m%8%'%/%H$O8=:_Dd;_$7$F$$$^$9!#(B
<P>
<P>$BJL$N%W%m%8%'%/%H$H$7$F$O(B
<A HREF="http://linux.sistina.com/lvm/">Logical Volume Manager</A>
$B$H$$$&$b$N$b$"$j$^$9!#(B
HP $B$N%W%m%8%'%/%H$K;w$?$b$N$G$9!#(B
<P>
<H2><A NAME="ss6.3">6.3 Linux <CODE>md</CODE> $B%+!<%M%k%Q%C%A(B</A>
</H2>
<P>
<!--
disk!technologies!md
-->
<!--
disk!technologies!raid
-->
<!--
disk!technologies!striping
-->
<!--
disk!technologies!translucence
-->
Linux Multi Disk (md) $B$O%V%m%C%/%l%Y%k$N5!G=$r?tB?$/Ds6!$7$^$9!#(B
$B3+H/$N?e=`$OJ}<0$K$h$C$F0[$J$j$^$9!#(B
<P>RAID 0 ($B%9%H%i%$%T%s%0(B) $B$H(B concatination ($BO"7k(B) $B$H$OHs>o$K0BDj$7$F$*$j!"(B
$B@=IJ%/%)%j%F%#$H8@$($^$9!#(B RAID 4 $B$H(B RAID 5 $B$b$+$J$j@.=O$7$F$$$^$9!#(B
<P>$B$$$/$D$+$N%l%Y%k$rAH$_9g$;$k$3$H$b2DG=$G!"(B
$BNc$($P%9%H%i%$%T%s%0(B (RAID 0) $B$5$;$?%I%i%$%V(B 2 $BBf$+$i$J$kAH$rFs$DMQ0U$7$F!"(B
$B$=$l$i$r8_$$$K%_%i!<$5$;$k(B (RAID 1) $B$3$H$b$G$-$^$9!#(B
RAID 0 $B$NB.EY$H(B RAID 1 $B$N?.Mj@-$H$rAH$_9g$;$k$3$H$,$G$-$k$o$1$G$9!#(B
<P>RAID $B$K2C$($F!"(B <CODE>md</CODE> $B%7%9%F%`$G$O%V%m%C%/%l%Y%k$N(B
$B%\%j%e!<%`4IM}%7%9%F%`$rDs6!$7$F$$$^$9(B ($B%"%k%U%!%l%Y%k$G$9$,(B)$B!#(B
$B$3$l$O%V%m%C%/%l%Y%k$G9T$o$l$k$N$G!"(B
$BG$0U$N%U%!%$%k%7%9%F%`$HAH$_9g$o$;$k$3$H$,$G$-$^$9!#(B
<CODE>FAT</CODE> $B$H(B Wine $B$G$5$($bMxMQ$,2DG=$G$9!#(B
<P>$B$I$N%I%i%$%V$rAH$_9g$;$l$P$9$Y$F$N%I%i%$%V$rJBNsF0:n$5$;$k$3$H$,$G$-$k$+!"(B
$B=<J,$K9M$($F$/$@$5$$!#(B
$BJs=7$O@-G=$N8~>e$H8N>cN($NDc2<$H$$$&7A$GLa$C$F$/$k$O$:$G$9!#(B
$B$h$j>\$7$/$O(B <CODE>md</CODE> $B$KIUB0$NJ8=q$rFI$s$G$/$@$5$$!#(B
<P>
<P>$B;DG0$J$,$i(B Linux $B$N%=%U%H%&%'%"(B RAID $B$O(B 2 $B$D$KJ,4t$7$F$7$^$C$F$$$^$9!#(B
$B8E$$0BDjHG$N(B 0.35 $B$H(B 0.42 $B$O(B
<A HREF="http://linas.org/linux/Software-RAID/Software-RAID.html">Software-RAID HOWTO</A>
$B$K8x<0HG$H$7$FJ8=q2=$5$l$F$$$^$9!#(B
$B?7$7$/!">/!9IT0BDj$J(B 0.90 $B$N%7%j!<%:$O!"(B
<A HREF="http://ostenfeld.dk/~jakob/Software-RAID.HOWTO/">Software RAID HOWTO</A>
$B$KHs8x<0HG$NJ8=q$,$"$j$^$9!#$3$A$i$N:n6H$O?J9TCf$G$9!#(B
<P>
<A HREF="http://www-mddsp.enel.ucalgary.ca/People/adilger.online-ext2/">patch for online growth of ext2fs</A>
$B$b3+H/=i4|$NCJ3,$G$9$,F~<j2DG=$G$9!#$^$?4XO":n6H$,(B Sourceforge $B$N(B
<A HREF="http://ext2resize.sourceforge.net/">the ext2fs resize project</A>
$B$G9T$o$l$F$$$^$9!#(B
<P>
<P>
<P>$B%R%s%H(B: $B$&$^$/F0$+$J$$>l9g$O!"(B <CODE>persistent-block</CODE> $B%U%i%0$r(B
$B%;%C%H$7K:$l$F$$$J$$$+3NG'$7$F2<$5$$!#(B
$B:#$N$H$3$m:G>e$N%I%-%e%a%s%H$O%=!<%9%3!<%I$G$9!#(B
<P>
<P>
<H2><A NAME="ss6.4">6.4 $B05=L(B</A>
</H2>
<P>
<!--
disk!technologies!compression
-->
<!--
disk!compression!DouBle
-->
<!--
disk!compression!Zlibc
-->
<!--
disk!compression!dmsdos
-->
<!--
disk!compression!e2compr
-->
$B%G%#%9%/$r05=L$9$k$+!"$=$l$H$b%U%!%$%k$r05=L$9$k$N$+$O!"(B
$B%U%!%$%k$r2u$7$F$7$^$&4m81@-$rCf?4E*$JAhE@$H$7$F!"(B
$B8=:_$G$b3hH/$K5DO@$5$l$F$$$kFbMF$G$9!#(B
$B?7$7$$$b$N$,9%$-$J%7%9%F%`4IM}<T$K$O$$$/$D$+$NA*Br;h$,$"$j$^$9!#(B
$B%+!<%M%k%b%8%e!<%k!"30It%i%$%V%i%j$X$N%Q%C%A$J$I?'!9$J<jK!$,B8:_$7$^$9$,!"(B
$B$=$l$i$NBgItJ,$K$O=q$-9~$_IT2D$H$$$C$?$h$&$J3F<o$N@)8B$,$^$@;D$C$F$$$^$9!#(B
$B3+H/$O5^%T%C%A$G?J$a$i$l$F$*$j!"(B
$B$3$NJ8=q$,=P$k$3$m$K$O4V0c$$$J$/$h$j9b5!G=$J$b$N$,=P$F$$$k$G$7$g$&!#(B
$B>o$K8@$($k$3$H$G$9$,:G?7HG$r%A%'%C%/$9$k$h$&$K$7$F$/$@$5$$!#(B
$B$3$3$K$O$$$/$D$+$N%]%$%s%?$N$_$r<($7$^$9!#(B
<P>
<UL>
<LI>DouBle $B7A<0$N%U%!%$%k05=L!#$?$@$7$^$@$$$/$D$+$N@)8B$,$"$j$^$9!#(B</LI>
<LI>Zlibc$B!#%U%!%$%k$,%m!<%I$5$l$k$H$-!"(B
$B$=$N>l$GF)2aE*$J05=L!??-E8$r9T$&$b$N$G$9!#(B</LI>
<LI>$B%+!<%M%k%b%8%e!<%k!#B>$N(B OS $B$GMQ$$$i$l$F$$$k(B
$B05=L%U%!%$%k$d05=L%Q!<%F%#%7%g%s$rFI$`$3$H$,$G$-$^$9!#(B
$B$?$@$7$$$^$N$H$3$m$O$[$H$s$I$N%7%9%F%`$,FI$_<h$j@lMQ$G$9!#(B</LI>
<LI>
<A HREF="http://bf9nt.uni-duisburg.de/mitarbeiter/gockel/software/dmsdos/">dmsdos</A>
$B8=:_$N%P!<%8%g%s(B(0.9.2.0) $B$O(B DOS $B$d(B Windows $B$G(B
$BMQ$$$i$l$F$$$k05=L%*%W%7%g%s$NB?$/$KBP1~$7$F$$$^$9!#(B
$B$^$@40A4$G$O$"$j$^$;$s$,!":n6H$O?J9TCf$G!"(B
$B$I$s$I$s?7$7$$5!G=$,DI2C$5$l$F$$$^$9!#(B</LI>
<LI><CODE>e2compr</CODE> $B$O(B <CODE>ext2fs</CODE> $B$K05=L5!G=3HD%$r9T$&%Q%C%1!<%8$G$9!#(B
$B$^$@%F%9%HCJ3,$G!"$7$?$,$C$F<g$K6=L#$r;}$C$F$$$k$N$O(B
$B%+!<%M%k%O%C%+!<C#$G$9$,!"6a$$$&$A$K0BDj$7!"(B
$B9-$/MQ$$$i$l$k$h$&$K$J$k$G$7$g$&!#(B
$B>\$7$$>pJs$O(B
<A HREF="http://e2compr.memalpha.cx/e2compr/">e2compr homepage</A>
$B$r8+$F$/$@$5$$!#(B
$BB.EY$b0BDj@-$bNI9%$G$"$k!"$H$$$&%l%]!<%H$r$b$i$C$F$$$^$9!#(B</LI>
</UL>
<P>
<P>
<H2><A NAME="ss6.5">6.5 ACL</A>
</H2>
<P>
<!--
disk!technologies!ACL
-->
$B%"%/%;%9%3%s%H%m!<%k%j%9%H(B (Access Control List: ACL) $B$O(B
$B%f!<%6$K$h$k%U%!%$%k%"%/%;%9$r%f!<%6!<%Y!<%9$G$h$j:Y$+$/4IM}$9$k$b$N$G$9!#(B
$B=>MhMQ$$$i$l$F$-$?=jM-<T!&%0%k!<%W!&$=$NB>(B
($B%G%#%l%/%H%j%j%9%H$K=P$k(B <CODE>drwxr-xr-x</CODE>)
$B$rCV$-Be$($k$3$H$rL\E*$H$7$F$$$^$9!#(B
$B$^$@(B Linux $B$G$OMxMQ$G$-$^$;$s$,!"(B
<CODE>ext2fs</CODE> $B$K$O$9$G$K3+H/$NB-3]$j$,MQ0U$5$l$F$$$k$N$G!"(B
$B%+!<%M%k(B 2.3 $B$G$O;H$($k$h$&$K$J$k$N$G$O$J$$$G$7$g$&$+!#(B
<P>
<H2><A NAME="ss6.6">6.6 <CODE>cachefs</CODE></A>
</H2>
<P>
<!--
disk!technologies!cachefs
-->
$B$3$l$O%O!<%I%G%#%9%/$N0lItJ,$r(B
CD-ROM $B$J$I$NCY$$%a%G%#%"$N%-%c%C%7%e$H$7$FMxMQ$7$h$&$H$$$&$b$N$G$9!#(B
SunOS $B$G;H$($^$9$,!"(B Linux $B$G$O$^$@$G$9!#(B
<P>
<H2><A NAME="ss6.7">6.7 $BF)2a(B (Translucent) $B%U%!%$%k%7%9%F%`!&7Q>5(B (Inheriting) $B%U%!%$%k%7%9%F%`(B</A>
</H2>
<P>
<!--
disk!technologies!translucent
-->
<!--
disk!technologies!inheriting
-->
$B$3$l$O=q$-9~$_;~%3%T!<$N%7%9%F%`$G!"(B
$B=q$-9~$_%G!<%?$O$b$H$N%=!<%9$,CV$+$l$F$$$?$N$H$OJL$N%7%9%F%`$KAw$i$l$^$9!#(B
$B0lJ}$G!"$3$N=q$-9~$_%G!<%?$ODL>o$N%U%!%$%k6u4V$K$"$k$h$&$K8+$($k$N$G$9!#(B
$B$7$?$,$C$F$3$N%U%!%$%k6u4V$O%*%j%8%J%k$N%G!<%?$r7Q>5$9$k$3$H$K$J$j!"(B
$B$+$DF)2aE*$J=q$-9~$_%P%C%U%!$O%f!<%6$4$H$KJL!9$K$G$-$^$9!#(B
<P>$B$$$m$$$m$J1~MQ$,9M$($i$l$^$9!#(B
<UL>
<LI>CD-ROM live $B%U%!%$%k%7%9%F%`$,99?72DG=$K$J$j!"=@Fp!&9bB.$K$J$j$^$9!#(B
$BNN0h$b@aLs$G$-$^$9!#(B
</LI>
<LI>$B?7$7$$%f!<%6$KBP$9$k%9%1%k%H%s%G!<%?$rMQ0U$7$F$*$-!"(B
$B%*%j%8%J%k%G!<%?$r0l%v=j$KJ];}$7$F$*$/$3$H$GMFNL$r@aLs$G$-$^$9!#(B
</LI>
<LI>$B3+H/%W%m%8%'%/%H$rJ?9T$7$F9T$&$H$-!"(B
$B$=$l$>$l$N%f!<%6$,B>$N%f!<%6$K1F6A$rM?$($:!"(B
$B%m!<%+%k$K%7%9%F%`$rJQ99$G$-$^$9!#(B</LI>
</UL>
<P>SunOS $B$O$3$N5!G=$r;}$C$F$*$j!"(B Linux $B$G$b3+H/Cf$G$9!#(B
Inheriting File System (<CODE>ifs</CODE>) $B$H$$$&8E$$%W%m%8%'%/%H$b$"$j$^$7$?$,!"(B
$B$3$l$ODd;_$7$F$7$^$$$^$7$?!#(B
$B8=:_$N%W%m%8%'%/%H$O(B <CODE>md</CODE> $B%7%9%F%`$N0lIt$H$J$k$b$N$G!"(B
$B%V%m%C%/%l%Y%k$G$NF)2a@-$rDs6!$7$F$$$^$9!#(B
$B$7$?$,$C$F$I$s$J%U%!%$%k%7%9%F%`$K$bE,MQ$G$-$^$9!#(B
<P>transluent $B%U%!%$%k%7%9%F%`$K$D$$$F$N(B
<A HREF="http://www.sun.ca/white-papers/tfs.html">$B$?$a$K$J$k%Z!<%8(B</A>
$B$,(B Sun $B$K$h$C$F8x3+$5$l$F$$$^$9!#(B
<P>$B$J$*(B
<A HREF="http://www.rational.com">Clearcase ($B8=:_$O(B Rational $B$,J]M-(B)</A>
$B$,!"H`$i$N(B UNIX $B%U%!%$%k%7%9%F%`$K$h$C$F!"(B
$B%=%U%H%&%'%"@_Dj$N4IM}$K(B translucent $B%U%!%$%k%7%9%F%`$r(B
$B3+H/!&Ia5Z$5$;$?$3$H$OCN$C$F$*$$$FNI$$$G$7$g$&!#(B
<P>
<P>
<P>
<P>
<H2><A NAME="physical-track-positioning"></A> <A NAME="ss6.8">6.8 $B%H%i%C%/$NJ*M}E*G[CV(B</A>
</H2>
<P>
<!--
disk!technologies!physical track positioning
-->
<!--
disk!technologies!track positioning
-->
$B$3$3$G<($9%H%j%C%/$O!"$+$D$F%I%i%$%V$,CY$/$FMFNL$b>.$5$+$C$?:"!"(B
$B$=$7$F%U%!%$%k$NBg$-$5$r8+$F$+$i%U%!%$%k$N<B:]$NG[CV$r7h$a$k$h$&$J(B
$B%U%!%$%k%7%9%F%`$,$b$F$O$d$5$l$F$$$?:"!"$K$O$H$F$b=EMW$J$b$N$G$7$?!#(B
$B$7$+$7B.EY$,Hs>o$K8~>e$7!"%I%i%$%V$d%3%s%H%m!<%i$G$N%-%c%C%7%e$,(B
$BBg$-$/8-$/$J$C$?8=:_$G$O$=$l$[$I$N0UL#$O$J$/$J$C$F$-$F$$$^$9!#(B
<P>$B$7$+$7:#F|$K$*$$$F$bB?>/$N@-G=8~>e$NM>CO$O;D$5$l$F$$$^$9!#(B
$B$=$7$F@$3&@)GF$,6a$E$$$?:#F|$G$5$($b!"(B
$B$3$l$rAa4|$KC#@.$9$k$K$O$o$l$o$l$O;}$AF@$k$9$Y$F$N5;$r(B
$B;H$o$J$1$l$P$J$i$J$$$N$G$9(B
<A HREF="http://www.mit.edu:8001/finger?linus@linux.cs.helsinki.fi">$B!*(B</A><P>$B$3$N<jK!$N0UL#$rM}2r$9$k$?$a$K$O!"8=:_$G$O<:$o$l$F$7$^$C$?CN<1(B
$B!V%;%/%?$N0LCV$K$h$C$F%G%#%9%/$N@-<A$,$I$N$h$&$KJQ$o$k$N$+!W(B
$B$rM}2r$9$kI,MW$,$"$j$^$9!#(B
$B%G%#%9%/$N2sE>Cf?4$+$iN%$l$?%H%i%C%/$G$O%G!<%?$NE>AwB.EY$OB.$/$J$j$^$9!#(B
$B$^$?Cf4V$N%H%i%C%/$r5/E@!?=*E@$H$9$k%7!<%/$O!"FbB&$+$i30B&!"(B
$B30B&$+$iFbB&$X$N%7!<%/$h$j$bB.$$$G$7$g$&!#(B
<P>$B$[$H$s$I$N%I%i%$%V$O0lDj$N3QB.EY$G2s$C$F$*$j!"(B
$B$^$?3F%H%i%C%/$K$*$1$k%G!<%?$N@~L)EY$O$@$$$?$$0lDj$K$J$C$F$$$^$9!#(B
$B$3$l$O$9$J$o$A!"30B&$N%H%i%C%/$G$OFbB&$N%H%i%C%/$KHf$Y$F(B
$B$:$C$HB.$$E>Aw$,9T$o$l$k$H$$$&$3$H$G$9!#(B
$B$7$?$,$C$FBg$-$J%i%$%V%i%j$J$I$rCV$/$N$KE,$7$F$$$^$9!#(B
<P>$B:G6a$N%G%#%9%/$G$OO@M}%8%*%a%H%j%^%C%W$r;H$C$F$$$k$b$N$b$"$j$^$9!#(B
$B$3$l$O<B:]$NJ*M}E*$J%^%C%W(B ($B%I%i%$%V$=$N$b$N$N%^%C%W(B) $B$H$O0[$J$C$F$$$k$?$a!"(B
$B!V??$sCfJU$N!W%H%i%C%/$N8+Ev$r$D$1$k$N$,>/!9Fq$7$/$J$k$+$b$7$l$^$;$s!#(B
<P>$B$[$H$s$I$N>l9g%H%i%C%/(B 0 $B$O:G$b30B&$N%H%i%C%/$G$"$j!"(B
$BB?$/$N?M!9$,$3$N2>Dj$rMQ$$$F$$$^$9!#(B
$B$7$+$7!"$3$N;v$K$O2?$NJ]>Z$b$J$$$3$H$b?4$KN1$a$F$*$/I,MW$,$"$j$^$9!#(B
<P>
<P>
<DL>
<DT><B>$BFbB&(B</B><DD><P>$B%;%/%?$NE>AwB.EY$OCY$/$J$j$^$9!#(B
$B$^$?%7!<%/$N5/E@!?=*E@$K$J$k>l9g!"%7!<%/F0:n$OCY$/$J$j$^$9!#(B
<P>$B$3$NItJ,$O9b$$@-G=$rI,MW$H$7$J$$NN0h$K3d$jEv$F$k$HNI$$$G$7$g$&!#(B
$B$?$H$($P(B DOS $B$d%k!<%H%U%!%$%k%7%9%F%`!"%W%j%s%H%9%W!<%k$J$I$G$9!#(B
<P>
<DT><B>$BCf4V(B</B><DD><P>$B%;%/%?$NE>AwB.EY$O0lHL$KFbB&$h$jB.$/!"$^$?%7!<%/F0:n$bB.$$$G$9!#(B
<P>$B$3$NFC@-$O%9%o%C%W$d(B <CODE>/tmp</CODE>$B!"(B<CODE>/var/tmp</CODE> $B$J$I!"(B
$BIQHK$KE>AwMW5a$,Mh$k$h$&$JNN0h$KE,$7$F$$$^$9!#(B
<P>
<DT><B>$B30B&(B</B><DD><P>$B%;%/%?$NE>AwB.EY$O:G$bB.$$$G$9$,!"(B
$B%7!<%/%?%$%`$OFbB&$HF1$8$h$&$KCY$/$J$C$F$$$^$9!#(B
<P>$B%i%$%V%i%j$J$I$NBg$-$J%U%!%$%k$,CV$+$l$kNN0h$r(B
$B$3$3$K3d$jEv$F$k$HNI$$$G$7$g$&!#(B
<P>
</DL>
<P>$BIQHK$K%"%/%;%9$5$l$k%;%/%?$r%G%#%9%/$NCf$[$I$KCV$1$P!"(B
$B%7!<%/$N:]$N%X%C%I$NJ?6Q0\F05wN%$r2<$2!"(B
$B%7!<%/%?%$%`$r8:$i$9$3$H$,$G$-$^$9!#(B
$B$3$N$h$&$K$9$k$K$O(B <CODE>fdisk</CODE> $B$d(B
<CODE>cfdisk</CODE> $B$r<B9T$7$F%Q!<%F%#%7%g%s$r??$sCf$"$?$j$K:n$C$?$j!"(B
$B$"$k$$$O(B <CODE>dd</CODE> $B%3%^%s%I$r;H$C$F(B
$B%G%#%9%/MFNL$NH>J,$[$I$NBg$-$5$N%U%!%$%k$r:n$j!"(B
$B$=$N8e$KIQHK$K;H$o$l$k%U%!%$%k$r:n@.$9$k!"$H$$$C$?J}K!$,$"$j$^$9!#(B
$B8e<T$NJ}K!$G$O:n6H8e$K%@%_!<%U%!%$%k$r>C$7$F$*$-$^$9!#(B
$B$$$:$l$b6u$N%G%#%9%/$r;H$$;O$a$k$H$-$NJ}K!$G$9!#(B
<P>$B8e<T$NJ}K!$O%K%e!<%9%9%W!<%k$K;H$&$HNI$$$G$7$g$&!#(B
$B%G!<%?%U%!%$%k$,CV$+$l$kA0$K!"(B
$B%G%#%l%/%H%j9=B$$rCf$[$I$N%H%i%C%/$KCV$/$N$G$9!#$3$N:n6H$K$h$C$F!"(B
$BB?>/$G$9$,%U%i%0%a%s%F!<%7%g%s$,8:$k8z2L$b4|BT$G$-$^$9!#(B
<P>$B$3$N$A$g$C$H$7$?$*$^$8$J$$$O!"IaDL$N%U%!%$%k%7%9%F%`$G$b(B
RAID $B%7%9%F%`$G$b;H$($^$9!#(B
RAID $B$G$O!"??$sCfEv$?$j$N%;%/%?$r7W;;$9$k$N$,(B
($BIT2DG=$H$^$G$O8@$$$^$;$s$,(B) $B$A$g$C$HFq$7$$$+$b$7$l$^$;$s!#(B
$B:G?7$N(B RAID $B$N%^%K%e%"%k$r8+$F$_$F$/$@$5$$!#(B
<P>$B$3$N:n6H$K$h$C$F8~>e$9$kB.EY$O%I%i%$%V$K$h$C$F0[$J$j$^$9$,!"(B
$B$G$bB?$/$N>l9g(B 50 $B%Q!<%;%s%HDxEY$N8~>e$,8+9~$a$^$9!#(B
<P>
<H3><A NAME="disk-speed-values"></A> $B%G%#%9%/$NB.EYCM(B</H3>
<P>
<!--
disk!technologies!disk speed values
-->
$B%G%#%9%/%X%C%I$N5!3#E*5!9=(B (head disk assembly: HDA) $B$NF1$8$b$N$,!"(B
$B0[$J$k%$%s%?!<%U%'!<%9(B (IDE $B$d(B SCSI $B$J$I(B) $B$G6&MQ$5$l$k$3$H$ONI$/$"$j$^$9!#(B
$B$7$?$,$C$F5!3#E*$JCM$O$@$$$?$$F1$8$K$J$j$^$9!#(B
$B:#F|$G$O$3$N5!3#E*$JItJ,$,B.EYE*$J8B3&$r7h$a$F$$$^$9$,!"(B
$B$?$f$^$L3+H/EXNO$K$h$C$FCe!9$HJ*;v$O?JJb$7$F$$$^$9!#(B
$B$5$F!"$3$3$K$OFs$D$N<gMW$J%Q%i%a!<%?$,$"$j$^$9!#(B
$B$=$l$>$l%_%jIC(B (ms) $BC10L$G5-=R$5$l$^$9!#(B
<P>
<UL>
<LI>$B%X%C%IF0:n(B - $BFI$_=q$-$r9T$&%X%C%I$,!"$"$k%H%i%C%/$+$i(B
$BJL$N%H%i%C%/$K0\F0$9$kB.EY$G$9!#%"%/%;%9;~4V$H$b8F$P$l$^$9!#(B
$B?t3X$,F@0U$J?M$O!"=PH/E@$H$7$F2DG=$J$9$Y$F$N%H%i%C%/$H!"(B
$BE~C#E@$H$7$F2DG=$J$9$Y$F$N%H%i%C%/$r9M$(!"(B
$B$3$l$i$rFs=E@QJ,$7$F$_$F$/$@$5$$!#(B
$B$3$l$OC<$N%H%i%C%/$+$i$b$&0lC<$^$G$r0\F0$9$k%9%H%m!<%/$N(B
1/3 $B$KEy$7$$$3$H$,$o$+$k$G$7$g$&!#(B
</LI>
<LI>$B2sE>B.EY(B - $BI,MW$J%;%/%?$KE~C#$9$k$^$G$N;~4V$r7hDj$7$^$9!#(B
$B$3$N;~4V$OBT$A;~4V(B (latency) $B$H$b8F$P$l$^$9!#(B</LI>
</UL>
<P>$B%X%C%I0\F0$N5!9=$,%9%F%C%Q!<%b!<%?$+$i%\%$%9%3%$%k$KJQ99$5$l$F0J9_$O!"(B
$B@-G=$N8~>e$OF,BG$A$K$J$j$^$7$?!#3+H/$N%(%M%k%.!<$O!"(B
$B8=:_$G$O;v<B>e2sE>B.EY$N8~>e$KCmNO$5$l$F$$$^$9!#(B
$B$3$l$K$h$kFs<!E*$J8z2L$H$7$F!"E>AwB.EY$N8~>e$b4|BT$G$-$^$9!#(B
<P>$B0J2<$KE57?E*$JCM$r5s$2$F$*$-$^$9!#(B
<BLOCKQUOTE><CODE>
<PRE>
Drive type
Access time (ms) | Fast Typical Old
---------------------------------------------
Track-to-track <1 2 8
Average seek 10 15 30
End-to-end 10 30 70
</PRE>
</CODE></BLOCKQUOTE>
<P>$BHs>o$K%O%$%(%s%I$J%I%i%$%V$G$b!"(B
$B%"%/%;%9;~4V$K$*$$$F$OJ?6QE*$J%I%i%$%V$H$?$$$7$?:9$,$J$$$3$H$,$o$+$j$^$9!#(B
$B$?$@$7%9%F%C%Q!<%b!<%?!<$rMQ$$$?8E$$%I%i%$%V$G$O!"Hs>o$KCM$O0-$$$G$9!#(B
<P>
<BLOCKQUOTE><CODE>
<PRE>
Rotational speed (RPM) | 3600 | 4500 | 4800 | 5400 | 7200 | 10000
-------------------------------------------------------------------
Latency (ms) | 17 | 13 | 12.5 | 11.1 | 8.3 | 6.0
</PRE>
</CODE></BLOCKQUOTE>
<P>$BBT$A;~4V(B (latency) $B$O;XDj$5$l$?%;%/%?$KE~C#$9$k$N$KI,MW$J;~4V$G$9$+$i!"(B
$B<0$OHs>o$K4JC1$G!"(B
<BLOCKQUOTE><CODE>
<PRE>
latency (ms) = 60000 / speed (RPM)
</PRE>
</CODE></BLOCKQUOTE>
$B$N$h$&$K$J$j$^$9!#(B
<P>$BL@$i$+$K$3$N7k2L$+$i$b!"3+H/EXNO$KBP$9$k8z2L$,>.$5$$$3$H$,$o$+$j$^$9!#(B
$B$7$+$7$3$3$G$^$k$C$-$jL5;k$7$?E@$H$7$F!"EENO>CHq$dG.!"(B
$B%N%$%:$J$I$NLdBj$,$"$k$3$H$bK:$l$F$O$J$j$^$;$s!#(B
<P>
<P>
<H2><A NAME="ss6.9">6.9 Yoke</A>
</H2>
<P>
<!--
disk!technologies!yoke
-->
<A HREF="http://www.it.uc3m.es/~ptb/cgi-bin/cvs-yoke.cgi">Linux Yoke Driver</A>
$B$N%Y!<%?HG$b$"$j$^$9!#$3$l$O(B Linux $B$N%V%m%C%/%G%P%$%9$r(B
$BB>$N%V%m%C%/%G%P%$%9$K%[%C%H%9%o%C%W2DG=$J$+$?$A$G(B
$BF)2aE*$K%P%$%s%I$9$k$b$N$G$9!#(B
$BFs$D$N%V%m%C%/%G%P%$%9(B ($BNc$($P(B
<CODE>/dev/hda</CODE> $B$H(B <CODE>/dev/loop0</CODE>)
$B$r%P%$%s%I$9$k$H!"JRJ}$N%G%P%$%9$X9T$o$l$?=q$-9~$_$O(B
$B$b$&JRJ}$K$b9T$o$l$k$3$H$K$J$j!"(B
$BN><T$+$i$NFI$_=P$7$,F1$87k2L$rM?$($k$3$H$K$J$j$^$9!#(B
<P>
<P>
<H2><A NAME="ss6.10">6.10 $BAH$_9g$o$;(B</A>
</H2>
<P>
<!--
disk!technologies!stacking
-->
OS $B$r%l%$%d!<9=B$$K@_7W$7$FF@$i$l$kMxE@$N0l$D$O!"(B
$BMWAG$NAH$_9g$;J}K!$r$$$m$$$mA*$Y$k$3$H$G$9!#(B
$BNc$($P(B CD-ROM $B$r(B <CODE>cashefs</CODE> $B$G%-%c%C%7%e$7!"(B
$B$=$N%-%c%C%7%e$O%9%H%i%$%T%s%0$7$?(B 2 $B$D$N%I%i%$%V$+$i9=@.$7$?$j$G$-$^$9!#(B
$B$"$k$$$O!"B>$N%^%7%s$+$i(B NFS $B%^%&%s%H$7$?%\%j%e!<%`$rMQ$$$F!"(B
$B%-%c%C%7%e$r(B translucent $B$K@_Dj$9$k$3$H$b$G$-$^$9!#(B
RAID $B$b2?AX$K$bAH$_9g$o$;$k$3$H$,$G$-$^$9!#(B
$BHs>o$K%7!<%/$r9bB.$K$7!"$+$D(B 3 $BBf$N%G%#%9%/$,8N>c$7$F$b(B
$B7QB3F0:n$G$-$k$h$&$J%7%9%F%`$r:n$k$3$H$b2DG=$G$9!#(B
$BAH$_9g$o$;$OL58B$G$9$,!"A[A|NO$N8B3&$+!"(B
$B$"$k$$$O(B ($B$h$j=EMW$JMWAG$G$"$k(B) $B6bA,E*$J8B3&$K$h$C$F@)8B$5$l$k$G$7$g$&!#(B
<P>
<H2><A NAME="ss6.11">6.11 $B$*4+$a(B</A>
</H2>
<P>
<!--
disk!technologies!recommendations
-->
$BA*Br2DG=$JAH$_9g$;$OL58B$G$9$,!"(B
$B$7$+$7$^$:$OFC<l$J5!G=$O;H$o$J$$$G!"4JC1$J@_Dj$+$i$O$8$a$^$7$g$&!#(B
$B$=$7$F2?$,I,MW$J$N$+!"(B
$B:GBg$N@-G=$,I,MW$H$5$l$k$N$O$I$NItJ,$+$r46$8$H$C$F$/$@$5$$!#(B
$B%\%H%k%M%C%/$K$J$C$F$$$k$N$O%"%/%;%9;~4V$J$N$+E>AwB.EY$J$N$+!"(B
$B$J$I$r$G$9!#<!$K3F%3%s%]!<%M%s%H$rCJ3,E*$K;n$7$F$_$^$7$g$&!#(B
$BAH$_9g$o$;$N<+M3EY$O6K$a$FBg$-$$$G$9!#(B
$B7P83$r@Q$s$GMM!9$J%3%s%]!<%M%s%H$r(B
$B4JC1$KAH$_9g$o$;$k$3$H$,$G$-$k$h$&$K$J$j$^$7$g$&!#(B
<P>RAID $B$rMQ$$$k$N$ODL>o$ONI$$9M$($G$9$,!"(B
$B$3$N%F%/%K%C%/$r40A4$KM}2r$7$F$*$/$3$H!"(B
$B$7$C$+$j$7$?%P%C%/%"%C%W$r$H$C$F$*$/$3$H$rK:$l$J$$$h$&$K!#(B
<P>
<P>
<HR>
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