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<H2><A NAME="s7">7. $B%Q%U%)!<%^%s%9(B</A></H2>
<P>$B$3$N%;%/%7%g%s$G$O(B Software RAID $B$r;H$C$F$$$k8=<B$N%7%9%F%`$+$i!"$?$/$5$s$N%Y%s%A%^!<%/$rJB$Y$F$_$^$7$?!#(B
<P>$B%Y%s%A%^!<%/$O(B <CODE>$B$+$o$$$$(B</CODE> $B%W%m%0%i%`$G!"%^%7%s$NJ*M}%a%b%j$N(B 2 $BG\0J>e$N%5%$%:$N%U%!%$%k$r;H$$$^$9!#(B
<P>$B%Y%s%A%^!<%/$O(B 1 $B$D$NBg$-$J%U%!%$%k$NF~=PNO%P%s%II}$r7WB,$9$k(B<EM>$B$@$1(B</EM>$B$G$9!#Bg5,LO$J(B read/write $B$K$*$1$k:GBg$N(B I/O $B%9%k!<%W%C%H$K6=L#$,$"$k$J$i$P!"CN$C$F$$$k2ACM$N$"$kAG@2$i$7$$$b$N$G$9!#$7$+$7$=$N$h$&$J?t;z$O%"%l%$$,%K%e!<%9%9%W!<%k!"%&%'%V%5!<%P!"$=$NB>!"<BMQ$5$l$?>l9g$K$I$NDxEY$N%Q%U%)!<%^%s%9$,=P$k$@$m$&$+$K$D$$$F$O!"$^$C$?$/Lr$KN)$?$J$$$b$N$G$9!#%Y%s%A%^!<%/$N?t;z$O!V?M9)E*$J!W%W%m%0%i%`$r<B9T$7$?7k2L$G$"$k$H$$$&$3$H$KN10U$9$Y$-$G$9!#8=<B$N$[$H$s$I$N%W%m%0%i%`$HF1$8$h$&$JF0$-$r$9$k$b$N$G$O$J$$$?$a!"$3$l$i$N?t;z$O8+$k$N$K$ONI$$$1$l$I$b!"8=<B$N@$3&$G$OF;6q$H$7$F;H$($k$b$N$G$O$"$j$^$;$s!#(B
<P>$B:#$N$H$3$m!";d<+?H$N%^%7%s$N7k2L$@$1$G$9!#9=@.$O!](B
<UL>
<LI>$B%G%e%"%k(B Pentium Pro 150 MHz</LI>
<LI>256 MB RAM (60 MHz EDO)</LI>
<LI>IBM UltraStar 9ES 4.5 GB(SCSI U2W) $B!_(B 3</LI>
<LI>Adaptec 2940U2W</LI>
<LI>IBM UltraStar 9ES 4.5 GB(SCSI UW) $B!_(B 1</LI>
<LI>Adaptec 2940 UW</LI>
<LI>Kernel 2.2.7 $B!\(B RAID $B%Q%C%A(B</LI>
</UL>
<P>3$BBf$N(B U2W $B%G%#%9%/$O(B U2W $B%3%s%H%m!<%i$K$V$i2<$,$j!"(BUW $B%G%#%9%/$O(B UW $B%3%s%H%m!<%i$K$V$i2<$,$C$F$$$^$9!#(B
<P>$B$3$N%7%9%F%`>e$G$O(B RAID $B;HMQ$NG!2?$K$+$+$o$i$:!"(B30 MB/s $B0J>e$r(B SCSI $B%P%9$K6/0z$KDL$9$3$H$OIT2DG=$J$h$&$G$9!#;d$N?dB,$K$h$k$H!"%7%9%F%`$,$+$J$j8E$$$N$G%a%b%j%P%s%II}$,(B SCSI $B%3%s%H%m!<%i$NG=NO$r@)8B$7$F$$$k$h$&$G$9!#(B
<P>
<H2><A NAME="ss7.1">7.1 RAID-0</A>
</H2>
<P><B>Read</B> $B$O(B<B>$BO"B3$7$?%V%m%C%/$NF~NO(B</B>$B$G$"$j!"(B<B>Write</B> $B$O(B<B>$BO"B3$7$?%V%m%C%/$N=PNO(B</B>$B$G$9!#%U%!%$%k%5%$%:$OA4$F$N%F%9%H$G(B 1 GB $B$G$7$?!#%F%9%H$O%7%s%0%k%f!<%6!<%b!<%I$G9T$$$^$7$?!#(BSCSI $B%I%i%$%P$O(B TCQ$B!J(BTagged Command Queueing$B!K$r;H$o$J$$@_Dj$K$7$^$7$?!#(B
<PRE>
|Chunk size | Block size | Read KB/s | Write KB/s |
| | | | |
|4k | 1k | 19712 | 18035 |
|4k | 4k | 34048 | 27061 |
|8k | 1k | 19301 | 18091 |
|8k | 4k | 33920 | 27118 |
|16k | 1k | 19330 | 18179 |
|16k | 2k | 28161 | 23682 |
|16k | 4k | 33990 | 27229 |
|32k | 1k | 19251 | 18194 |
|32k | 4k | 34071 | 26976 |
</PRE>
<P>
<P>$B>e5-$h$j!"(BRAID chunk-size $B$rJQ$($F$b@-G=$KBg$-$J:9$O=P$J$$$h$&$G$9!#$7$+$7(B ext2fs $B%V%m%C%/%5%$%:$O2DG=$J8B$jBg$-$$J}$,NI$$$h$&$G$9!#(BIA-32 $B$G$O(B 4 KB $B$G$9!JNc$($P%Z!<%8%5%$%:$J$I!K!#(B
<P>
<H2><A NAME="ss7.2">7.2 TCQ $B$K$h$k(B RAID-0</A>
</H2>
<P>$B:#EY$O(B SCSI $B%I%i%$%P$r!"(BTCQ$B!J(BTagged Command Queueing$B!K$r;H$&$h$&$K@_Dj$7!"%-%e!<$N?<$5$r(B 8 $B$H$7$F$^$9!#$=$l0J30$OA0$HF1$8$G$9!#(B
<PRE>
|Chunk size | Block size | Read KB/s | Write KB/s |
| | | | |
|32k | 4k | 33617 | 27215 |
</PRE>
<P>
<P>$B$3$l0J>e$N%F%9%H$O$7$F$^$;$s!#(BTCQ $B$K$h$C$F=q9~@-G=$,$o$:$+$K8~>e$7$^$9$,!"A4BN$H$7$F$OBg$7$?0c$$$O$J$$$H8@$($k$G$7$g$&!#(B
<P>
<H2><A NAME="ss7.3">7.3 RAID-5</A>
</H2>
<P>$B%"%l%$$r(B RAID-5 $B%b!<%I$G9=@.$7!"F1MM$J%F%9%H$r9T$J$$$^$7$?!#(B
<PRE>
|Chunk size | Block size | Read KB/s | Write KB/s |
| | | | |
|8k | 1k | 11090 | 6874 |
|8k | 4k | 13474 | 12229 |
|32k | 1k | 11442 | 8291 |
|32k | 2k | 16089 | 10926 |
|32k | 4k | 18724 | 12627 |
</PRE>
<P>chunk-size $B$H%V%m%C%/%5%$%:$NN>J}$,<B:]$N:9$r:n$k$h$&$G$9!#(B
<P>
<H2><A NAME="ss7.4">7.4 RAID-10</A>
</H2>
<P>RAID-10 $B$O!V%_%i!<2=%9%H%i%$%W!W!"$"$k$$$O(B 2 $B$D$N(B RAID-0 $B%"%l%$$N(B RAID-1 $B%"%l%$$G$9!#(Bchunk-size $B$O(B RAID-1 $B%"%l%$$H(B 2 $B$D$N(B RAID-0 $B%"%l%$$N(B chunk-size $B$G$9!#Hs>o$K0UL#$N$"$k@_Dj$@$H;W$$$^$9$,!"(Bchunk-size $B$rJQ$($?>l9g$K$I$&$J$k$+$H$$$&%F%9%H$O$7$^$;$s$G$7$?!#(B
<PRE>
|Chunk size | Block size | Read KB/s | Write KB/s |
| | | | |
|32k | 1k | 13753 | 11580 |
|32k | 4k | 23432 | 22249 |
</PRE>
<P>$B$3$l0J>e$N%F%9%H$O$7$F$$$^$;$s!#%U%!%$%k%5%$%:$O(B 900 MB $B$G$7$?!#<B$O(B 4 $B$D$N%Q!<%F%#%7%g%s$O$=$l$>$l(B 500 MB $B$G!"$3$N@_Dj!J(B2$B$D$N(B 1000 MB $B$N%"%l%$$N(B RAID-1$B!K$G$O(B 1 G $B$N%U%!%$%k$N$?$a$N%9%Z!<%9$,$J$+$C$?$b$N$G$9$+$i!#(B
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