<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"> <HTML> <HEAD> <META NAME="GENERATOR" CONTENT="SGML-Tools 1.0.9"> <TITLE>HOWTO: Multi Disk System Tuning: $B%G%#%9%/4XO"5;=Q(B</TITLE> <LINK HREF="Multi-Disk-HOWTO-7.html" REL=next> <LINK HREF="Multi-Disk-HOWTO-5.html" REL=previous> <LINK HREF="Multi-Disk-HOWTO.html#toc6" REL=contents> </HEAD> <BODY> <A HREF="Multi-Disk-HOWTO-7.html">$B<!$N%Z!<%8(B</A> <A HREF="Multi-Disk-HOWTO-5.html">$BA0$N%Z!<%8(B</A> <A HREF="Multi-Disk-HOWTO.html#toc6">$BL\<!$X(B</A> <HR> <H2><A NAME="technologies"></A> <A NAME="s6">6. $B%G%#%9%/4XO"5;=Q(B</A></H2> <P> <!-- disk!technologies --> $B<j;}$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$$$k$N$G!"(B $B8e$[$I$h$j>\$7$/>R2p$7$^$9!#(B <P> <P> <H3><A NAME="raid-levels"></A> RAID $B$N%l%Y%k(B</H3> <P> <!-- disk!technologies!RAID!RAID levels --> RAID $B$K$O2?CJ3,$+$N%l%Y%k$,$"$j!"$=$l$>$l0[$J$C$?5!G=$r;}$C$F$$$^$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$$!"(B $B%G!<%?$r(B RAID 0 $B$N%9%H%i%$%T%s%0$N$h$&$J7A$G5-O?$7$^$9!#(B $B$^$?>iD9@-$rJ];}$9$k%G%#%9%/(B 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$B$7$?$,$C$F5!3#E*$JCM$O$@$$$?$$F1$8$K$J$j$^$9!#(B $B:#F|$G$O$3$N5!3#E*$JItJ,$,B.EYE*$J8B3&$r7h$a$F$$$^$9$,!"(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 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