/usr/share/doc/HOWTO/ja-html/The-Software-RAID-HOWTO-4.html

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<HR>
<H2><A NAME="s4">4. RAID $B%;%C%H%"%C%W(B</A></H2>

<P>
<H2><A NAME="ss4.1">4.1 $B0lHLE*$J%;%C%H%"%C%W(B</A>
</H2>

<P>$B<!$N$b$N$O!"$I$N(B RAID $B%l%Y%k$G$bI,MW$H$9$k$b$N$G$9!](B
<UL>
<LI>$B%+!<%M%k!#0BDjHG$N(B 2.2.X $B$^$?$O:G?7$N(B 2.0.X. $B$,$$$$$G$7$g$&!#(B</LI>
<LI>RAID $B%Q%C%A!#:G6a$N%+!<%M%k$KMxMQ$G$-$k%Q%C%A$,!"BgDq$N>l9g$"$j$^$9!#(B</LI>
<LI>RAID tools</LI>
<LI>$BG&BQ!"%T%6!"$*5$$KF~$j$N%+%U%'%$%s0{NA(B</LI>
</UL>
<P>$B$3$l$iA4$F$N%=%U%H%&%'%"$O(B <CODE>ftp://ftp.fi.kernel.org/pub/linux</CODE> $B$G8+$D$1$i$l$^$9!#(BRAID tools $B$H%Q%C%A$O(B <CODE>daemons/raid/alpha</CODE> $B%5%V%G%#%l%/%H%j$K$"$j$^$9!#%+!<%M%k$O(B <CODE>kernel</CODE> $B%5%V%G%#%l%/%H%j$G8+$D$1$i$l$^$9!#(B
<P>$B%+!<%M%k$K%Q%C%A$rEv$F!";H$$$?$$%l%Y%k$N(B RAID $B%5%]!<%H$r4^$a$k$h$&$K9=@.$7$^$9!#$=$7$F%3%s%Q%$%k$7!"%$%s%9%H!<%k$r9T$J$$$^$9!#(B
<P>$B<!$K!"(BRAID tools $B$rE83+$7$F@_Dj$7!"%3%s%Q%$%k!"%$%s%9%H!<%k$r9T$J$$$^$9!#!JLuCm!'(Bconfigure, make, make install $B$@$1$G;d$N>l9g$O(B OK $B$G$7$?!K(B
<P>$B$3$N;~E@$G%j%V!<%H$9$k$H(B <CODE>/proc/mdstat</CODE> $B$H$$$&%U%!%$%k$,3NG'$G$-$k$O$:$G$9!#$=$N%U%!%$%k$O$"$J$?$N!V$*M'C#!W$@$H$$$&$3$H$r21$($F$*$$$F$/$@$5$$!#(B<CODE>cat </CODE><CODE>/proc/mdstat</CODE> $B$r<B9T$7$FFbMF$r3NG'$7$F$_$k$H!"EPO?$5$l$F$$$k(B RAID $B$NFC@-$,$o$+$j$^$9!JNc$($P(B RAID $B%b!<%I!K!#$^$@(B RAID $B%G%P%$%9$OB8:_$7$J$$$O$:$G$9!#(B
<P>RAID $B$K4^$a$?$$%Q!<%F%#%7%g%s$r$D$/$j$^$9!#(B
<P>$B$3$3$+$i@h$O%b!<%I$KFC2=$7$?FbMF$K$J$j$^$9!#(B
<P>
<P>
<H2><A NAME="ss4.2">4.2 $B%j%K%"%b!<%I(B</A>
</H2>

<P>$B$G$O!"$^$:>/$J$/$H$b(B 2 $B$D$N%Q!<%F%#%7%g%s$rMQ0U$7$^$9!#$=$l$>$l$OF1$8Bg$-$5$G$"$kI,MW$O$"$j$^$;$s!J$?$@!"$G$-$l$PF1$8$K!K!#$=$l$i$r$*8_$$$K$/$C$D$1$?$$$o$1$G$9!#(B
<P><CODE>/etc/raidtab</CODE> $B%U%!%$%k$r@_Dj$7$^$9!#;d$O(B raidtab $B$K%j%K%"%b!<%I$G(B 2 $BBf$N%G%#%9%/$GF0:n$5$;$k$?$a$N@_Dj$r9T$J$$$^$7$?!#FbMF$O0J2<$NDL$j$G$9!](B
<P>
<PRE>
raiddev /dev/md0
        raid-level      linear
        nr-raid-disks   2
        persistent-superblock 1
        device          /dev/sdb6
        raid-disk       0
        device          /dev/sdc5
        raid-disk       1
</PRE>

$BM=Hw%G%#%9%/$O$3$3$G$O%5%]!<%H$5$l$^$;$s!#%G%#%9%/$,;`$s$@$i!"%"%l%$$bF;O"$l$K$J$j$^$9!#M=Hw%G%#%9%/$KCV$/>pJs$O$"$j$^$;$s!#(B
<P>$B$G$O!"%"%l%$$r:n$j$^$7$g$&!#%3%^%s%I$rBG$A9~$_$^$9!#(B
<PRE>
  mkraid /dev/md0
</PRE>
<P>$B$3$l$G%"%l%$$r=i4|2=$7$F(B persistent superblock $B$r=q$-!"%"%l%$$r;OF0$7$^$9!#(B
<P><CODE>/proc/mdstat</CODE> $B$r8+$F$/$@$5$$!#%"%l%$$,Av$C$F$$$kMM;R$,J,$+$j$^$9!#(B
<P>$B$3$l$G%U%!%$%k%7%9%F%`$r:n@.$9$k$3$H$,$G$-$^$9!#%^%&%s%H$d(B fstab $B$K5-=R$J$I!"B>$N%G%P%$%9$HF1MM$N;v$,$G$-$^$9!#(B
<P>
<P>
<H2><A NAME="ss4.3">4.3 RAID-0</A>
</H2>

<P>$B$[$\F1$8%5%$%:$N(B 2 $BBf0J>e$N%G%P%$%9$rMQ0U$7$^$9!#$=$l$i$NMFNL$N7k9g$d!"JBNs$K%"%/%;%9$9$k$3$H$K$h$C$F@-G=8~>e$b?^$k$o$1$G$9!#(B
<P><CODE>/etc/raidtab</CODE> $B%U%!%$%k$r@_Dj$7$^$9!#0J2<$O$=$N0lNc$G$9!](B
<PRE>
raiddev /dev/md0
        raid-level      0
        nr-raid-disks   2
        persistent-superblock 1
        chunk-size     4
        device          /dev/sdb6
        raid-disk       0
        device          /dev/sdc5
        raid-disk       1
</PRE>

$B%j%K%"%b!<%I$HF1MM$K!"M=Hw%G%#%9%/$O%5%]!<%H$5$l$^$;$s!#(BRAID-0 $B$K$O>iD9@-$,$J$$$N$G!"%G%#%9%/$,;`$L$H%"%l%$$bF;O"$l$K$J$j$^$9!#(B
<P>$B%"%l%$$r=i4|2=$9$k$?$a$K0J2<$N%3%^%s%I$rBG$A9~$_$^$9!#(B
<PRE>
  mkraid /dev/md0
</PRE>

$B%9!<%Q!<%V%m%C%/$r=i4|2=$7!"(BRAID $B%G%P%$%9$r;OF0$9$k$o$1$G$9!#2?$,5/$3$C$F$$$k$N$+$O(B <CODE>/proc/mdstat</CODE> $B$r8+$F$/$@$5$$!#%G%P%$%9$,F0$$$F$$$k$3$H$,J,$+$k$O$:$G$9!#(B
<P>$B$3$l$G(B /dev/md0 $B$r%U%)!<%^%C%H$d%^%&%s%H!"$0$A$c$0$A$cMpMQ$9$k;v$b$G$-$k$h$&$K$J$j$^$7$?!#(B
<P>
<P>
<H2><A NAME="ss4.4">4.4 RAID-1</A>
</H2>

<P>$B$[$\F1$8%5%$%:$N(B 2 $BBf$N%G%P%$%9$rMQ0U$7$^$9!"$*8_$$$K%_%i!<$7$?$$$o$1$G$9!#$G$-$l$P$b$&(B 1 $BBf%G%P%$%9$rMQ0U$7$^$7$g$&!#$=$l$rBT5!MQ$NM=Hw%G%#%9%/$H$7$^$9!#M=Hw%G%#%9%/$O%"%/%F%#%V$J%G%P%$%9$,2u$l$?;~$K!"<+F0E*$K%_%i!<$rJd$C$F$/$l$^$9!#(B
<P><CODE>/etc/raidtab</CODE> $B%U%!%$%k$r@_Dj$7$^$9!](B
<PRE>
raiddev /dev/md0
        raid-level      1
        nr-raid-disks   2
        nr-spare-disks  0
        chunk-size     4
        persistent-superblock 1
        device          /dev/sdb6
        raid-disk       0
        device          /dev/sdc5
        raid-disk       1
</PRE>

$BM=Hw%G%#%9%/$,$"$k>l9g!"<!$N$h$&$J;XDj$r9T$J$$%G%P%$%9$rDI2C$9$k$3$H$,$G$-$^$9!#(B
<PRE>
        device          /dev/sdd5
        spare-disk      0
</PRE>

$B$3$N>l9g$O(B nr-spare-disks $B%(%s%H%j$r(B 1 $B$K@_Dj$9$k$N$rK:$l$J$$$h$&$K!#(B
<P>$B$5$F!"(BRAID $B$r=i4|2=$9$kMQ0U$,@0$$$^$7$?!#%_%i!<$O(B 2 $BBf$N%G%P%$%9$NFbMF$^$G4^$a$FF14|$9$k$h$&$K9=C[$7$J$1$l$P$J$j$^$;$s!J%G%P%$%9$O$^$@%U%)!<%^%C%H$5$l$F$J$$$N$G!"Bg$7$?LdBj$G$O$J$$$s$G$9$,!K!#(B
<P>$B%_%i!<$N=i4|2=$r3+;O$9$k%3%^%s%I$rBG$A9~$_$^$9!#(B
<PRE>
  mkraid /dev/md0
</PRE>
<P>
<P><CODE>/proc/mdstat</CODE> $B%U%!%$%k$r%A%'%C%/$7$^$7$g$&!#(B/dev/md0 $B%G%P%$%9$N%_%i!<$N:F9=C[$,;O$^$C$?;v$r<($7$F$*$j!"9=C[:n6H$N=*N;M=Dj;~9o$rCN$k$3$H$,$G$-$^$9!#(B
<P>$B:F9=C[$O%"%$%I%kCf$N(B I/O $B%P%s%II}$r;H$C$F$J$5$l$^$9$+$i!"%7%9%F%`$O0JA0$H$"$^$jJQ$o$i$:5!IR$KF0:n$7B3$1$k$O$:$G$9!#%G%#%9%/(B LED $B$b$+$J$j8w$C$F$$$k$O$:$G$9$,!#(B
<P>$B:F9=C[%W%m%;%9$OF)2aE*$J$N$G!"%_%i!<$,:F9=C[Cf$@$H$7$F$b%G%P%$%9$r;H$&$3$H$,$G$-$^$9!#(B
<P>$B:F9=C[$N?J9TCf$K%G%P%$%9$r%U%)!<%^%C%H$7$F$_$F$/$@$5$$!#$A$c$s$HF0:n$9$k$O$:$G$9!#$^$?!":F9=C[$N?J9TCf$G$"$C$F$b%^%&%s%H$7$F;H$&$3$H$,$G$-$^$9!#$b$A$m$s:F9=C[Cf$K%G%#%9%/$,2u$l$?$j$7$?$i!"$=$j$c$"1?$,0-$$$H$7$+8@$$$h$&$,$"$j$^$;$s$,!#(B
<P>
<P>
<H2><A NAME="ss4.5">4.5 RAID-4</A>
</H2>

<P><B>$BCm0U!*(B</B> $B;d<+?H$O$3$N@_Dj$G$O%F%9%H$7$F$^$;$s!#0J2<$N@_Dj$O$"$/$^$GM=A[$G$"$j!"<B:]$KAv$i$;$?$3$H$O$"$j$^$;$s!#(B
<P>3 $BBf0J>e$N$[$\F1$8%5%$%:$N%G%P%$%9$rMQ0U$7$^$9!#(B1 $B$D$@$1$,Ht$SH4$1$FB.$$$N$,$$$$$G$9$M!#$3$l$i$r7k9g$7$F(B 1 $B$D$NBg$-$J%G%P%$%9$H$7!">iD9@-$b;}$?$;$?$$$o$1$G$9!#(B
<P>/etc/raidtab $B%U%!%$%k$r@_Dj$7$^$9!](B
<PRE>
raiddev /dev/md0
        raid-level      4
        nr-raid-disks   4
        nr-spare-disks  0
        persistent-superblock 1
        chunk-size      32
        device          /dev/sdb1
        raid-disk       0
        device          /dev/sdc1
        raid-disk       1
        device          /dev/sdd1
        raid-disk       2
        device          /dev/sde1
        raid-disk       3
</PRE>

$BM=Hw%G%#%9%/$,$"$l$PF1MM$KF~$l$F$/$@$5$$!#0J2<$N$h$&$K!](B
<PRE>
        device         /dev/sdf1
        spare-disk     0
</PRE>
<P>$B$3$l$G%"%l%$$N=i4|2=$,$G$-$^$9!#$$$D$bDL$j!"<!$N%3%^%s%I$rBG$A9~$s$G$/$@$5$$!#(B
<PRE>
   mkraid /dev/md0
</PRE>
<P>$B%G%P%$%9$r%U%)!<%^%C%H$9$kA0$K(B 
<A HREF="#mke2fs">mke2fs $B$N$?$a$N%*%W%7%g%s(B</A> $B%;%/%7%g%s$r8+$F$/$@$5$$!#(B
<P>
<H2><A NAME="ss4.6">4.6 RAID-5</A>
</H2>

<P>3 $BBf0J>e$N$[$\F1$8%5%$%:$N%G%P%$%9$rMQ0U$7$^$9!#$3$l$i$r7k9g$7!">iD9@-$bJ;$;;}$C$?>uBV$G;H$&$o$1$G$9!#M=Hw%G%#%9%/$b$"$C$?J}$,$$$$$G$7$g$&!#$3$N%G%#%9%/$OB>$N%G%P%$%9$,8N>c$9$k$^$G$O;H$o$l$^$;$s!#(B
<P>N $BBf$N%G%P%$%9$r;H$&$H$7$F!":G$b>.$5$$$b$N$N%5%$%:$r(B S $B$H$9$k$H!"%"%l%$$N%5%$%:$O(B $B!J(BN - 1) * S $B$H$J$j$^$9!#$3$N!V<:$o$l$?!W%9%Z!<%9$,!"%Q%j%F%#!J>iD9@-!K>pJs$N$?$a$K;H$o$l$k$o$1$G$9!#$I$N%G%#%9%/$,8N>c$7$F$bA4$F$N%G!<%?$O40A4$J$^$^$G$9!#$7$+$7(B 2 $BBf$N%G%#%9%/$,8N>c$7$F$7$^$C$?$i!"A4$F$N%G!<%?$,>C<:$9$k$3$H$K$J$j$^$9!#(B
<P>/etc/raidtab $B%U%!%$%k$r@_Dj$7$^$9!](B
<PRE>
raiddev /dev/md0
        raid-level      5
        nr-raid-disks   7
        nr-spare-disks  0
        persistent-superblock 1
        parity-algorithm        left-symmetric
        chunk-size      32
        device          /dev/sda3
        raid-disk       0
        device          /dev/sdb1
        raid-disk       1
        device          /dev/sdc1
        raid-disk       2
        device          /dev/sdd1
        raid-disk       3
        device          /dev/sde1
        raid-disk       4
        device          /dev/sdf1
        raid-disk       5
        device          /dev/sdg1
        raid-disk       6
</PRE>

$BM=Hw%G%#%9%/$,$"$k>l9g$OF1MM$K!](B
<PRE>
        device         /dev/sdh1
        spare-disk     0
</PRE>

$B$J$I$H$9$k$o$1$G$9!#(B
<P>chunk-size $B$N(B 32 KB $B$H$$$&CM$O!"$3$N%5%$%:$NIaDL$N%U%!%$%k%7%9%F%`$N$?$a$N%G%U%)%k%H$H$7$F$OE,@Z$JCM$G$7$g$&!#>e5-$N(B raidtab $B$G@_Dj$5$l$?%"%l%$$N%5%$%:$O(B 6 $B!_(B 6 GB = 36 GB $B$H$J$j$^$9!J$D$^$j(B (N - 1) * S = (7 - 1) * 6 = 36 $B$C$F$3$H$G$9!K!#%U%!%$%k%7%9%F%`$O(B ext2 $B$G%V%m%C%/!&%5%$%:$O(B 4 KB $B$H$7$^$7$?!#%U%!%$%k%7%9%F%`$,Hs>o$KBg$-$$$+!"Hs>o$KBg$-$$%U%!%$%k$r<}MF$9$k$J$i!"%"%l%$$N(B chunk-size $B$H%U%!%$%k%7%9%F%`$N%V%m%C%/%5%$%:$NN>J}$rJQ$($F$_$k$HNI$$$G$7$g$&!#(B
<P>$B$5$!!"$*$7$c$Y$j$O=<J,$G$7$g$&!#(Braidtab $B$r@_Dj$7$^$7$?$+$i!"F0$+$7$F8+$^$7$g$&!#0J2<$N%3%^%s%I$rBG$A9~$_$^$9!#(B
<PRE>
  mkraid /dev/md0
</PRE>

$B2?$,5/$3$k$+8+$F$/$@$5$$!#$&$^$/$$$1$P%"%l%$$N:F9=C[$r3+;O$9$k$?$a!"%G%#%9%/$OLTNu$KF0$-;O$a$^$9!#2?$,5/$3$C$F$$$k$N$+$O(B <CODE>/proc/mdstat</CODE> $B$r8+$F$/$@$5$$!#(B
<P>$B%G%P%$%9$N:n@.$,$&$^$/$$$1$P!":F9=C[%W%m%;%9$N;O$^$j$G$9!#:F9=C[$N$3$N%U%'!<%:$G$O!"%"%l%$$O$^$@40A4$H$O$$$($^$;$s$,!"40A4$K5!G=$7$F$/$l$^$9!#%U%)!<%^%C%H$b$G$-$^$9$7!"IaDL$K;H$&$3$H$,$G$-$^$9!J$b$A$m$s%G%P%$%9$,8N>c$7$?$i$$$1$^$;$s!K!#(B
<P>$B%G%P%$%9$r%U%)!<%^%C%H$9$kA0$K(B 
<A HREF="#mke2fs">mke2fs $B$N$?$a$N%*%W%7%g%s(B</A> $B%;%/%7%g%s$r8+$F$/$@$5$$!#(B
<P>RAID $B%G%P%$%9$,F0:n$7$F$$$l$P!"Dd;_$d:F3+$r$9$k$N$K0J2<$N%3%^%s%I$r;H$&$3$H$,$G$-$^$9!#(B
<PRE>
  raidstop /dev/md0
</PRE>

$B$"$k$$$O(B
<PRE>
  raidstart /dev/md0
</PRE>
<P>$B$3$l$i$r=i4|@_Dj%U%!%$%k$KF~$l$F2?2s$b%j%V!<%H$9$k$h$j$b!"$b$&$A$g$C$H@h$KFI$_?J$s$G!"<+F08!=P5!G=$r;H$C$?J}$,$$$$$G$7$g$&!#(B
<P>
<P>
<H2><A NAME="ss4.7">4.7 The Persistent Superblock</A>
</H2>

<P>$B8E$-NI$-;~Be!V(BGood Old Days$B!W(B(TM)$B$G$O!"(Braidtools $B$O(B <CODE>/etc/raidtab</CODE> $B$rFI$_9~$s$G%"%l%$$r=i4|2=$7$F$$$^$7$?!#$7$+$7$3$l$O(B <CODE>/etc/raidtab</CODE> $B%U%!%$%k$,B8:_$9$k%U%!%$%k%7%9%F%`$,%^%&%s%H$5$l$F$$$k$3$H$,A0Ds$H$J$j$^$9!#(BRAID $B$+$i%V!<%H$7$?$$$J$I$H$$$&>l9g$O!"$3$l$O$h$m$7$/$J$$$G$7$g$&!#(B
<P>$B99$K(B RAID $B%G%P%$%9>e$N%U%!%$%k%7%9%F%`$r%^%&%s%H$9$k$H$-$N!"8E$$%"%W%m!<%A$O>/!9J#;($G$7$?!#DL>o$N$h$&$K(B <CODE>/etc/fstab</CODE> $B$K=q$$$F$*$1$PNI$$$N$G$O$J$/!"=i4|2=%9%/%j%W%H$G%^%&%s%H$7$J$1$l$P$J$i$J$+$C$?$N$G$9!#(B
<P>persistent superblock $B$O$3$l$i$NLdBj$r2r7h$7$F$/$l$^$9!#(B<CODE>/etc/raidtab</CODE> $BCf$N(B <CODE>persistent-superblock</CODE> $B%*%W%7%g%sIU$-$G%"%l%$$r=i4|2=$9$k$H!"FCJL$J%9!<%Q!<%V%m%C%/$,%"%l%$$K;22C$7$F$$$kA4$F$N%G%#%9%/$N@hF,ItJ,$K=q$-$3$^$l$^$9!#$3$l$K$h$j%+!<%M%k$O!"(BRAID$B%G%P%$%9$N9=@.$rD>@\%G%#%9%/$+$iFI$a$k$h$&$K$J$j$^$9!#IaDL$N9=@.%U%!%$%k$@$C$?$i$$$D$G$bFI$a$k$o$1$8$c$"$j$^$;$s!#(B
<P>$B$G$b(B <CODE>/etc/raidtab</CODE> $B%U%!%$%k$O$=$N$^$^$K$7$F$*$-$^$7$g$&!#8e$G%"%l%$$r:F9=C[$9$k:]$KI,MW$K$J$k$+$b$7$l$^$;$s!#(B
<P>$B%7%9%F%`$N%V!<%H;~$K(B RAID $B%G%P%$%9$r<+F08!=P$7$?$1$l$P!"(Bpersistent superblock $B$OI,?\$G$9!#$3$l$K$D$$$F$O(B<B>$B<+F08!=P(B</B>$B%;%/%7%g%s$G=R$Y$k$3$H$K$7$^$9!#(B
<P>$B!JLuCm!'(Bpersistent $B$H$$$&C18l$O<-=q$G0z$/$H!"4h8G$J!";}B3@-$,$"$k!"ITCG$N!"$H8@$C$?0UL#$r;}$D7AMF;l$G$9!#$&$^$$Lu8l$,;W$$$D$-$^$;$s$G$7$?$N$G!"1Q8lI=5-$N$^$^$K$7$F$"$j$^$9!K(B
<P>
<P>
<H2><A NAME="ss4.8">4.8 Chunk $B%5%$%:(B</A>
</H2>

<P>chunk-size$B$K$D$$$F@bL@$9$k$3$H$O2ACM$,$"$k$G$7$g$&!#J#?t$N%G%#%9%/$KBP$7$F!"40A4$KF1;~$K=q$-$3$`$3$H$O$G$-$^$;$s!#(B2 $BBf$N%G%#%9%/$,$"$j(B 1 $B%P%$%H$N%G!<%?$r=q$-$?$$$H$9$k$H!"$=$l$>$l$N%G%#%9%/$K(B 4 $B%S%C%H$:$D=q$/I,MW$,$"$j$^$9!#<B:]$K$O6v?tHVL\$N%S%C%H$O%G%#%9%/(B 0 $B$X!"4q?tHVL\$O%G%#%9%/(B 1 $B$X$H=q$/I,MW$,$"$j$^$9$,!"%O!<%I%&%'%"$O$=$s$J$3$H$r%5%]!<%H$7$F$O$/$l$^$;$s!#$=$NBe$o$j$K(B Chunk $B%5%$%:$r@_Dj$7$^$9!#$3$l$O%G%P%$%9$K=q$-9~$`$3$H$,$G$-$k:G>.$N!V%"%H%_%C%/$J!W%G!<%?NL$H$7$FDj5A$5$l$^$9!#!JLuCm!'(BChunk = $B!V$+$?$^$j!W$H$G$bLu$;$PNI$$$G$7$g$&$+!K%G%#%9%/(B 2 $BBf$N(B RAID-0 $B$N%1!<%9$G!"(B4 KB $B$N(B Chunk $B%5%$%:(B $B$K$h$k(B 16 KB $B$N=q9~$rA[Dj$9$k$H!"(B1 $BHVL\$H(B 3 $BHVL\$N(B Chunk $B$O:G=i$N%G%#%9%/$X!"(B2 $BHVL\$H(B 4 $BHVL\$N(B Chunk $B$OBhFs$N%G%#%9%/$K=q$-9~$^$l$k$3$H$K$J$j$^$9!#$3$N$h$&$KBgNL$N=q$-9~$_$KBP$7$F$O!"$+$J$jBg$-$$(B Chunk $B$r;XDj$9$k$3$H$K$h$C$F%*!<%P!<%X%C%I$r8:$i$;$k$+$b$7$l$^$;$s$,!">.$5$$%U%!%$%k$NB?$$%"%l%$$G$O(B Chunk $B%5%$%:$r>.$5$/$7$?J}$,NI$$$+$b$7$l$^$;$s!#(B
<P>Chunk $B%5%$%:$O%j%K%"%b!<%I$r=|$/A4$F$N(B RAID $B%l%Y%k$G;XDj$9$k$3$H$,$G$-$^$9!#(B
<P>$B:GE,$N%Q%U%)!<%^%s%9$r5a$a$k$J$i!"%"%l%$>e$N%U%!%$%k%7%9%F%`$N%V%m%C%/%5%$%:$HF1MM$K!"$$$m$s$JCM$G$N<B83$,I,MW$H$J$k$G$7$g$&!#(B
<P><CODE>/etc/raidtab</CODE> $BCf$N(B chunk-size $B%*%W%7%g%s$KBP$9$k0z?t$O!"%-%m%P%$%HC10L$N(B chunk $B%5%$%:$r;XDj$7$^$9!#!V(B4$B!W$O!V(B4 KB$B!W$r0UL#$9$k$3$H$K$J$j$^$9!#(B
<P>
<H3>RAID-0</H3>

<P>$B%G!<%?$O%"%l%$Cf$N%G%#%9%/$K!V$[$H$s$I!WJBNs$K=q$-9~$^$l$^$9!#<B:]$K$O(B <CODE>chunk-size</CODE> $B%P%$%H$N%G!<%?$,=g<!!"3F%G%#%9%/$K=q$+$l$k$o$1$G$9!#(B
<P>4 KB $B$N(B Chunk $B%5%$%:$r;XDj$7$F(B 3 $BBf$N%G%#%9%/$K(B 16 KB $B$r=q$/>l9g!"(BRAID-0 $B%7%9%F%`$G$O%G%#%9%/(B 0, 1, 2 $B$K(B 4 KB $B$r!";D$j$N(B 4 KB $B$r%G%#%9%/(B 0 $B$K=q$/$3$H$K$J$j$^$9!#(B
<P>32 KB $B$N(B chunk-size $B$OBgItJ,$N%"%l%$$GE,@Z$JCM$G$7$g$&$,!":GE,$NCM$O%I%i%$%V$N?t$d%U%!%$%k%7%9%F%`$NFbMF!"$=$NB>$N?'!9$JMW0x$KHs>o$K0MB8$7$^$9!#:G9b$N%Q%U%)!<%^%s%9$rF@$k$?$a$K$O<B83$r$7$FLO:w$9$kI,MW$,$"$k$G$7$g$&!#(B
<P>
<H3>RAID-1</H3>

<P>$B=q$-9~$_$K$D$$$F$O(B chunk-size $B$O%"%l%$$K1F6A$7$^$;$s!#A4$F$N%G!<%?$O$H$K$+$/A4$F$N%G%#%9%/$K=q$+$l$J$1$l$P$J$i$J$$$+$i$G$9!#$7$+$7FI$_9~$_$N>l9g!"(Bchunk-size $B$G%"%l%$$N%G%#%9%/$+$iO"B3E*$K$I$l$/$i$$$N%G!<%?$rFI$`$+$r;XDj$7$^$9!#%"%l%$Cf$NA4$F$N%"%/%F%#%V$J%G%#%9%/$,F1$8>pJs$r;}$D$N$G!"(BRAID-0 $B$N$h$&$KJBNs$KFI$_9~$a$k$o$1$G$9!#(B
<P>
<H3>RAID-4</H3>

<P>RAID-4 $B%"%l%$$X$N=q$-9~$_;~$K$O!"%Q%j%F%#%G%#%9%/>e$G%Q%j%F%#>pJs$b99?7$5$l$J$1$l$P$J$j$^$;$s!#(Bchunk-size $B$O%Q%j%F%#%V%m%C%/$N%5%$%:$H$J$j$^$9!#(BRAID-4 $B%"%l%$$K(B 1 $B%P%$%H$r=q$-9~$b$&$H$9$k$H!"(BN-1 $BBf$N%G%#%9%/$+$i(B <CODE>chunk-size</CODE> $B%P%$%H$N%G!<%?$rFI$_9~$_%Q%j%F%#>pJs$r7W;;$7!"(B<CODE>chunk-size</CODE> $B%P%$%H$N%G!<%?$,%Q%j%F%#%G%#%9%/$K=q$+$l$k$3$H$K$J$j$^$9!#(B
<P>RAID-0 $B$N>l9g$HF1MM!"(Bchunk-size $B$OFI$_9~$_@-G=$K1F6A$7$^$9!#(BRAID-4 $B$+$i$NFI$_9~$_J}$O$[$\F1$8$@$+$i$G$9!#(B
<P>
<H3>RAID-5</H3>

<P>RAID-5 $B$G$O!"(Bchunk-size $B$O(B RAID-4 $B$N>l9g$H40A4$KF1$80UL#$r;}$A$^$9!#(B
<P>RAID-5 $B$N$?$a$N9gM}E*$J(B chunk-size $B$O(B 128 KB $B$G$9$,!"$$$D$b$N$h$&$K<B83$7$FLO:w$7$?$$$+$b$7$l$^$;$s$M!#(B
<P>$B$^$?(B 
<A HREF="#mke2fs">mke2fs $B$N$?$a$N%*%W%7%g%s(B</A> $B%;%/%7%g%s$b8+$F$/$@$5$$!#$3$l$O(B RAID-5 $B$N@-G=$K1F6A$r5Z$\$7$^$9!#(B
<P>
<P>
<H2><A NAME="mke2fs"></A> <A NAME="ss4.9">4.9 mke2fs$B$N$?$a$N%*%W%7%g%s(B</A>
</H2>

<P>mke2fs $B$G(B RAID-4 $B$d(B raid-5 $B$N%G%P%$%9$r%U%)!<%^%C%H$9$k;~$KMxMQ$G$-$k!"FCJL$J%*%W%7%g%s$,$"$j$^$9!#(B<CODE>-R stride=nn</CODE> $B%*%W%7%g%s$K$h$C$F!"(Bmke2fs $B$O(B RAID $B%G%P%$%9>e$K(B ext2 $B$NFC<l$J%G!<%?9=B$$r$&$^$/CV$/$3$H$,$G$-$^$9!#(B
<P>chunk-size$B$,(B 32 KB $B$J$i!"$=$N(B 32 KB $B$NO"B3$7$?%G!<%?$O(B 1 $BBf$N%G%#%9%/$N>e$KCV$+$l$^$9!#(B4 KB $B$N%V%m%C%/%5%$%:$G(B ext2 $B%U%!%$%k%7%9%F%`$r9=C[$7$?$$$J$i$P!"(B1 $B$D$N%"%l%$$N(B Chunk$B$NCf$K(B 8 $B$D$N%U%!%$%k%7%9%F%`%V%m%C%/$,$"$k$HM}2r$G$-$^$9!#%U%!%$%k%7%9%F%`$r:n@.$9$k;~$K(B mke2fs $B%f!<%F%#%j%F%#$K$3$N>pJs$rEO$9$3$H$,$G$-$^$9!#(B
<PRE>
  mke2fs -b 4096 -R stride=8 /dev/md0
</PRE>
<P>RAID-{4,5}$B$N%Q%U%)!<%^%s%9$O$3$N%*%W%7%g%s$KHs>o$K1F6A$5$l$^$9!#(Bstride $B%*%W%7%g%s$,B>$N(B RAID $B%l%Y%k$N>l9g$K$I$N$h$&$J1F6A$r5Z$\$9$+$N3N?.$,$"$j$^$;$s!#C/$+$3$l$K4X$9$k>pJs$,$"$l$P;d$^$GAw$C$F$/$@$5$$!#(B
<P>ext2fs $B$N%V%m%C%/%5%$%:$O!"%U%!%$%k%7%9%F%`$N%Q%U%)!<%^%s%9$K(B<CODE>$BHs>o$K(B</CODE>$B1F6A$7$^$9!#?tI4%a%,%P%$%H0J>e$N$I$s$J%U%!%$%k%7%9%F%`>e$G$b!"%V%m%C%/%5%$%:$O(B 4 KB $B$K$9$Y$-$G$9!#>.$5$$%U%!%$%k$r$?$/$5$sCV$/$J$iJL$G$9$,(B
<P>
<P>
<H2><A NAME="ss4.10">4.10 $B<+F08!=P(B</A>
</H2>

<P>$B<+F08!=P$O!"%+!<%M%k$,%V!<%H;~$KIaDL$N%Q!<%F%#%7%g%s$N8!=P8e!"(BRAID$B%G%P%$%9$r<+F0E*$K8!=P$G$-$k$h$&$K$7$^$9!#(B
<P>$B$3$l$K$OI,MW$J$b$N$,$$$/$D$+$"$j$^$9!#(B
<OL>
<LI>$B%+!<%M%k$K<+F08!=P%5%]!<%H$,I,MW$G$9$N$G!"$3$l$r%A%'%C%/$7$^$9!#(B</LI>
<LI>persistent-superblock $B$r;H$C$F(B RAID $B%G%P%$%9$r:n@.$7$^$9!#(B</LI>
<LI>RAID $B$G;H$o$l$k%G%P%$%9$N%Q!<%F%#%7%g%s%?%$%W$r!"(B<B>0xFD</B>$B!J(Bfdisk$B$r;H$C$F%?%$%W$r!V(Bfd$B!W$K$9$k!K$K%;%C%H$7$^$9!#(B</LI>
</OL>
<P>NOTE: $B%Q!<%F%#%7%g%s%?%$%W$rJQ$($kA0$K!"(BRAID $B$,F0$$$F$$$J$$$3$H$r3NG'$7$F$/$@$5$$!#%G%P%$%9$r;_$a$k$K$O(B <CODE>raidstop /dev/md0</CODE> $B$r;H$C$F$/$@$5$$!#(B
<P>$B>e5-(B 1, 2, 3 $B$r@_Dj$9$l$P<+F08!=P$N@_Dj$O=*$o$j$G$9!#%j%V!<%H$7$F$_$F$/$@$5$$!#%7%9%F%`$,N)$A>e$,$k$H$-!"(Bcat <CODE>/proc/mdstat</CODE> $B$G(B RAID $B$,Av$C$F$$$kMM;R$,$o$+$j$^$9!#(B
<P>$B%V!<%H$N4V!"$3$N$h$&$J46$8$N%a%C%;!<%8$,I=<($5$l$^$9!](B
<PRE>
 Oct 22 00:51:59 malthe kernel: SCSI device sdg: hdwr sector= 512
  bytes. Sectors= 12657717 [6180 MB] [6.2 GB]
 Oct 22 00:51:59 malthe kernel: Partition check:
 Oct 22 00:51:59 malthe kernel:  sda: sda1 sda2 sda3 sda4
 Oct 22 00:51:59 malthe kernel:  sdb: sdb1 sdb2
 Oct 22 00:51:59 malthe kernel:  sdc: sdc1 sdc2
 Oct 22 00:51:59 malthe kernel:  sdd: sdd1 sdd2
 Oct 22 00:51:59 malthe kernel:  sde: sde1 sde2
 Oct 22 00:51:59 malthe kernel:  sdf: sdf1 sdf2
 Oct 22 00:51:59 malthe kernel:  sdg: sdg1 sdg2
 Oct 22 00:51:59 malthe kernel: autodetecting RAID arrays
 Oct 22 00:51:59 malthe kernel: (read) sdb1's sb offset: 6199872
 Oct 22 00:51:59 malthe kernel: bind&lt;sdb1,1>
 Oct 22 00:51:59 malthe kernel: (read) sdc1's sb offset: 6199872
 Oct 22 00:51:59 malthe kernel: bind&lt;sdc1,2>
 Oct 22 00:51:59 malthe kernel: (read) sdd1's sb offset: 6199872
 Oct 22 00:51:59 malthe kernel: bind&lt;sdd1,3>
 Oct 22 00:51:59 malthe kernel: (read) sde1's sb offset: 6199872
 Oct 22 00:51:59 malthe kernel: bind&lt;sde1,4>
 Oct 22 00:51:59 malthe kernel: (read) sdf1's sb offset: 6205376
 Oct 22 00:51:59 malthe kernel: bind&lt;sdf1,5>
 Oct 22 00:51:59 malthe kernel: (read) sdg1's sb offset: 6205376
 Oct 22 00:51:59 malthe kernel: bind&lt;sdg1,6>
 Oct 22 00:51:59 malthe kernel: autorunning md0
 Oct 22 00:51:59 malthe kernel: running: &lt;sdg1>&lt;sdf1>&lt;sde1>&lt;sdd1>&lt;sdc1>&lt;sdb1>
 Oct 22 00:51:59 malthe kernel: now!
 Oct 22 00:51:59 malthe kernel: md: md0: raid array is not clean --
  starting background reconstruction 
</PRE>

$B$3$l$O@5>o$K%7%c%C%H%@%&%s$5$l$J$+$C$?!JNc$($P%^%7%s$,%/%i%C%7%e$7$?!K(BRAID-5 $B%"%l%$$N<+F08!=P;~$K=PNO$5$l$?$b$N$G$9!#:F9=C[$O<+F0E*$K;O$^$j$^$9!#$3$N%G%P%$%9$r$3$N>uBV$N$^$^%^%&%s%H$7$F$b40A4$K0BA4$G$9!#$H$$$&$N$b:F9=C[$OF)2aE*$G!"A4$F$N%G!<%?$,0l4S(B (consistent) $B$7$F$$$k$+$i$G$9!J0l4S@-$,$J$$$N$O%Q%j%F%#>pJs$@$1$G$9$,!"%G%P%$%9$,8N>c$9$k$^$G$OI,MW$"$j$^$;$s!K!#(B
<P>$B<+F0;OF0$7$?%G%P%$%9$O%7%c%C%H%@%&%s;~$K$b<+F0Dd;_$7$^$9!#=i4|2=%9%/%j%W%H$K$D$$$F?4G[$9$kI,MW$O$"$j$^$;$s!#(B/dev/md $B%G%P%$%9$O(B /dev/sd $B$d(B /dev/hd $B%G%P%$%9$HF1$8$h$&$K;H$($^$9!#(B
<P>$B4JC1$G$9$M!#(B
<P>raidstart/raidstop $B%3%^%s%I$N;H$$J}$rCN$k$?$a$K=i4|2=%9%/%j%W%H$rGA$$$F$_$k$N$b$$$$$G$7$g$&!#$3$l$i$OI8=`E*$J(B RedHat $B$N=i4|2=%9%/%j%W%H$K$O!"$?$$$F$$4^$^$l$F$$$^$9!#$3$l$i$,;H$o$l$k$N$O5l<0$J(B RAID $B$N$?$a$J$N$G!"<+F08!=PIU$-$N?7$7$$(B RAID $B$K$OMQ$r$J$7$^$;$s!#$=$N9T$O:o$C$F$7$^$$$^$7$g$&!"$=$l$G$9$Y$F$&$^$/$$$-$^$9!#(B
<P>
<P>
<H2><A NAME="ss4.11">4.11 RAID $B$G%V!<%H(B</A>
</H2>

<P>RAID $B%G%P%$%9>e$N%k!<%H%U%!%$%k%7%9%F%`$K%7%9%F%`$r%;%C%H%"%C%W$9$k$K$O$$$/$D$+$NJ}K!$,$"$j$^$9!#(B
$B:#$N$H$3$m!"(BRedHat Linux 6.1 $B$N%0%i%U%#%+%k!&%$%s%9%H!<%k$@$1$,!"(BRAID $B%G%P%$%9$X$ND>@\%$%s%9%H!<%k$rDs6!$7$F$$$k$K$9$.$^$;$s!#(B
$B$G$9$+$i!"$d$j$?$1$l$P>/$7$R$M$kI,MW$,$"$j$^$9$,!"$A$c$s$H2DG=$J$3$H$G$9!#(B
<P>$B:G?7$N8x<0$J(B lilo $B%G%#%9%H%j%S%e!<%7%g%s(B($B%P!<%8%g%s(B 21 )$B$G$O(B RAID $B%G%P%$%9$r07$$$^$;$s!"$G$9$+$i%V!<%H;~$K%+!<%M%k$r(B RAID $B%G%P%$%9$+$i%m!<%I$9$k$3$H$O$G$-$^$;$s!#$3$N%P!<%8%g%s$r;H$C$F$$$k>l9g$O(B <CODE>/boot</CODE> $B%U%!%$%k%7%9%F%`$O(B RAID $B$G$J$$%G%P%$%9$N>e$KCV$+$J$1$l$P$J$i$J$$$3$H$K$J$j$^$9!#%7%9%F%`$,3N<B$K%V!<%H$9$kJ}K!$O(B RAID $B%G%P%$%9Cf$N$9$Y$F$N%I%i%$%V>e$KF1$8$h$&$K(B <CODE>/boot</CODE> $B%Q!<%F%#%7%g%s$r:n$j!"(BBIOS $B$,MxMQ$G$-$k(B($BNc$($P0lHVL\$N(B)$B%I%i%$%V$+$i>o$K%G!<%?$r%m!<%I$9$k$h$&$K@_Dj$9$k$3$H$G$9!#$=$N$?$a$K$O%7%9%F%`Cf$N8N>c$7$?%G%#%9%/$+$i%V!<%H$7$h$&$H$7$F$O$$$1$^$;$s!#(B
<P>redhat 6.1 $B$G$O!"(BRAID-1 $B$G(B <CODE>/boot</CODE> $B$r07$&$3$H$,$G$-$k(B lilo 21 $B$X$N%Q%C%A$,MxMQ$G$-$k$h$&$K$J$j$^$7$?!#(B
$BB>$N%l%Y%k$G$OF/$-$^$;$s!"Cm0U$7$F$/$@$5$$!#(BRAID-1 ($B%_%i!<%j%s%0(B) $B$@$1$,%5%]!<%H$5$l$k(B RAID $B%l%Y%k$G$9!#(B
$B$3$N%Q%C%A(B (<CODE>lilo.raid1</CODE>) $B$O!"(Bredhat $B$N$I$N%_%i!<$G$b(B <CODE>dist/redhat-6.1/SRPMS/SRPMS/lilo-0.21-10.src.rpm</CODE> $B$G8+$D$+$k$G$7$g$&!#(B
$B$3$N%Q%C%A$rE,MQ$5$l$?(B LILO $B$O!"(B <CODE>lilo.conf</CODE> $B$NCf$G(B <CODE>boot=/dev/md0</CODE> $B$H$$$&L?Na$r<u$1IU$1$k$h$&$K$J$j!"%_%i!<$r9=@.$9$k$I$A$i$N%G%#%9%/$+$i$G$b%V!<%H$G$-$k$h$&$K$7$F$/$l$^$9!#(B
<P>$B%7%9%F%`$,3N<B$K%V!<%H$9$k$3$H$,$G$-$k$b$&0l$D$NJ}K!$O!"A4$F$N%;%C%H%"%C%W$,=*N;$7$?;~E@$G%V!<%H!&%U%m%C%T!<$r:n$k$3$H$G$9!#(B<CODE>/boot</CODE> $B%U%!%$%k%7%9%F%`$r:\$;$?%G%#%9%/$,;`$s$G$b!"$$$D$G$b%U%m%C%T!<$+$i%V!<%H$9$k$3$H$,$G$-$^$9!#(B
<P>
<P>
<H2><A NAME="ss4.12">4.12 RAID $B>e$N%k!<%H%U%!%$%k%7%9%F%`(B</A>
</H2>

<P>$B%7%9%F%`$r(B RAID $B>e$G%V!<%H$9$k$K$O!"%k!<%H%U%!%$%k%7%9%F%`!J(B / $B!K$,(B RAID $B%G%P%$%9>e$G%^%&%s%H$5$l$J$1$l$P$J$j$^$;$s!#$3$l$r<B8=$9$k(B 2 $B$D$NJ}K!$r0J2<$K<($7$^$9!#8=:_$N%G%#%9%H%j%S%e!<%7%g%s!J>/$J$/$H$b;d$,CN$C$F$$$k!K$O(B RAID $B%G%P%$%9>e$K%$%s%9%H!<%k$9$k$3$H$r%5%]!<%H$7$F$$$^$;$s$+$i!"J}K!$H$7$F$OIaDL$N(B(RAID $B$G$O$J$$(B)$B%Q!<%F%#%7%g%s$K%$%s%9%H!<%k$r9T$J$$!"%$%s%9%H!<%k$,=*N;$7$?8e$K(B RAID $B$G$J$$%k!<%H%U%!%$%k%7%9%F%`$NFbMF$r?7$7$$(B RAID $B%G%P%$%9$K0\F0$7$^$9!#(B
<P>
<H3>$BJ}K!(B 1</H3>

<P>$B$3$NJ}K!$G$O!"$3$l$+$i9=@.$7$h$&$H$7$F$$$k(B RAID $B$H$OJL$KM=Hw$N%G%#%9%/$rMQ0U$7!"$=$N>e$K%7%9%F%`$r%$%s%9%H!<%k$7$^$9!#(B
<P>
<UL>
<LI>$B:G=i$O!"IaDL$N%7%9%F%`$rM=Hw%G%#%9%/>e$K%$%s%9%H!<%k$7$^$9!#(B</LI>
<LI>$B%+!<%M%k!"%Q%C%A!"(Braidtools $B$rMQ0U$7!"?7$7$$(B RAID $BBP1~%+!<%M%k$G%7%9%F%`$r%V!<%H$7$^$9!#(BRAID $B%5%]!<%H$O%b%8%e!<%k$H$7$F%m!<%I$9$k$N$G$J$/!"%+!<%M%k$KAH$_9~$_$^$9!#(B</LI>
<LI>$B<!$K!"%k!<%H%U%!%$%k%7%9%F%`$H$7$F;H$&M=Dj$N(B RAID $B$r@_Dj!"9=C[$r9T$J$$$^$9!#$3$l$O$3$NJ8=q$N$I$3$+$K5-=R$7$F$"$k$h$&$K!"$4$/IaDL$NJ}K!$G9T$J$$$^$9!#(B</LI>
<LI>RAID $B$,%V!<%H;~$K$-$A$s$HF0:n$9$k$3$H$r3NG'$9$k$?$a$K%7%9%F%`$r%j%V!<%H$7$F$_$^$9!#F0$/$O$:$G$9!#(B</LI>
<LI>$B?7$7$$%"%l%$$K%U%!%$%k%7%9%F%`$r:n$j!J(B<CODE>mke2fs</CODE> $B$r;H$&!K!"(B/mnt/newroot $B$K%^%&%s%H$7$^$9!#(B</LI>
<LI>$B?7$7$$%k!<%H%U%!%$%k%7%9%F%`!J%"%l%$!K$K!"8=:_$N%k!<%H%U%!%$%k%7%9%F%`!JM=Hw%G%#%9%/!K$NFbMF$r%3%T!<$7$^$9!#$$$m$$$mJ}K!$O$"$j$^$9$,!"$?$H$($P!"$3$N$h$&$K$7$^$9!#(B
<PRE>
 cd /
 find . -xdev | cpio -pm /mnt/newroot
</PRE>
</LI>
<LI>$B%k!<%H%U%!%$%k%7%9%F%`$H$7$F@5$7$$%G%P%$%9$r;H$&$?$a$K(B <CODE>/mnt/newroot/etc/fstab</CODE> $B%U%!%$%k$r=$@5$7$^$9!J(B<CODE>/dev/md?</CODE> $B$r%k!<%H%G%P%$%9$K$7$^$9!K!#(B</LI>
<LI>$B8=:_$N(B <CODE>/boot</CODE> $B%U%!%$%k%7%9%F%`$r%"%s%^%&%s%H$7$F!"$=$NBe$o$j$K%V!<%H%G%P%$%9$r(B <CODE>/mnt/newroot/boot</CODE> $B$K%^%&%s%H$7$^$9!#$3$l$O<!$N%9%F%C%W$G(B LILO $B$r$&$^$/Av$i$;$k$?$a$KI,MW$G$9!#(B</LI>
<LI>$B@5$7$$%G%P%$%9$r;X$9$h$&$K(B <CODE>/mnt/newroot/etc/lilo.conf</CODE> $B$r=$@5$7$^$9!#%V!<%H%G%P%$%9$O$^$@IaDL$N%G%#%9%/!J(BRAID $B$G$J$$%G%P%$%9!K$G$J$1$l$P$J$j$^$;$s$,!"%k!<%H%G%P%$%9$O?7$7$$(B RAID $B$r<($7$F$$$kI,MW$,$"$j$^$9!#$=$N:n6H$,=*$o$C$?$i!"(B
<PRE>
 lilo -r /mnt/newroot
</PRE>
 $B$r<B9T$7$^$9!#(BLILO $B$O%(%i!<$J$7$G40N;$7$J$1$l$P$J$j$^$;$s!#(B</LI>
<LI>$B%7%9%F%`$r:F5/F0$7$^$9!"$9$Y$F$,M=DjDL$jN)$A>e$,$k$N$r3NG'$7$F$/$@$5$$(B :)</LI>
</UL>
<P>$B$3$N:n6H$r(B IDE $B%G%#%9%/$G$7$F$$$k$J$i$P!"(BBIOS $B$GA4$F$N%G%#%9%/$r!V(Bauto-detect$B!W%?%$%W$K@_Dj$7$F$/$@$5$$!#$=$&$9$l$P(B BIOS $B$,%G%#%9%/$N(B 1$BBf$r8+$D$1$i$l$J$$$h$&$J;~$G$b%^%7%s$O%V!<%H$9$k$3$H$,$G$-$k$G$7$g$&!#(B
<P>
<H3>$BJ}K!(B 2</H3>

<P>$B$3$NJ}K!$O!"(Bfailed-disk $BL?Na$N;H$($k(B raidtools $B$H%Q%C%A$r;H$&I,MW$,$"$j$^$9!#$3$l$O(B 2.2.10 $B0J9_$N$9$Y$F$N%+!<%M%k$N$?$a$N(B raidtools $B$H%Q%C%A$H$J$k$G$7$g$&!#(B
<P>$B$3$NJ}K!$O(B RAID $B%l%Y%k(B 1 $B0J>e(B<B>$B$N$_(B</B>$B$G;HMQ$9$k$3$H$,$G$-$^$9!#0U?^E*$K8N>c$H%^!<%/$5$l$?%G%#%9%/>e$K%7%9%F%`$r%$%s%9%H!<%k$7!"$=$l$+$i%G%0%l!<%I%b!<%I$GAv$k$3$H$K$J$k(B RAID $B$K%3%T!<$7!":G8e$KITMW$K$J$C$?!V%$%s%9%H!<%k%G%#%9%/!W$N8E$$%7%9%F%`$r>C5n$7$F(B RAID $B$r9=C[$7!"Hs%G%0%l!<%I%b!<%I$GF0:n$5$;$^$9!#(B
<P>$B!JLuCm!'%G%0%l!<%I%b!<%I(B "degraded mode" $B$H$$$&$N$O!">iD9@-$N$"$k(B RAID $B$N0lIt$,8N>c$7$F$$$k$,!"%G!<%?$N40A4@-$OJ]$?$l$F$$$k>uBV$N$3$H$G$9!K(B
<P>
<UL>
<LI>$B:G=i$O!"IaDL$N%7%9%F%`$r(B 1 $BBf$N%G%#%9%/!J8e$G(B RAID $B$KAH$_9~$^$l$^$9!K>e$K%$%s%9%H!<%k$7$^$9!#$3$N%G%#%9%/!J$^$?$O%Q!<%F%#%7%g%s!K$,:G$b>.$5$$$b$N$G$J$$$3$H$,=EMW$G$9!#$5$b$J$$$H8e$G(B RAID $B$K2C$($k$3$H$,$G$-$J$/$J$j$^$9!*(B</LI>
<LI>$B%+!<%M%k!"%Q%C%A!"(Braidtools $B$J$I$rF~<j$7$F$-$^$7$g$&!#I,MW$J(B RAID $B%5%]!<%H$rAH$_9~$s$@?7$7$$%+!<%M%k$G!"%7%9%F%`$,%V!<%H$9$k$h$&$K$7$^$9!#(B</LI>
<LI><CODE>raidtab</CODE> $B%U%!%$%k$N%k!<%H%G%P%$%9$r(B <CODE>failed-disk</CODE> $B$H$7$F(B RAID $B$r%;%C%H%"%C%W$7$^$9!#(B<CODE>raidtab</CODE> $B$K$O(B <CODE>failed-disk</CODE> $B$r:G=i$N%G%#%9%/$H$7$FCV$$$F$O$$$1$^$;$s!#(BRAID $B$r;OF0$9$k;~$KLdBj$K$J$j$^$9!#(BRAID $B$r9=C[$7!"%U%!%$%k%7%9%F%`$r:n$j$^$9!#(B</LI>
<LI>$B%j%V!<%H$7$F$_$F!"M=DjDL$j(B RAID $B$,N)$A>e$,$k$3$H$r3NG'$7$^$9!#(B</LI>
<LI>$BA0$N%;%/%7%g%s$K$*$$$F5-=R$5$l$F$k$N$HF1MM$N$d$jJ}$G!"%7%9%F%`%U%!%$%k$r%3%T!<$7$F!"%k!<%H%G%P%$%9$H$7$F(B RAID $B$r;H$&$h$&$K%7%9%F%`$r:F@_Dj$7$^$9!#(B</LI>
<LI>$B%7%9%F%`$,(B RAID $B$+$i$&$^$/%V!<%H$7$?$i!"(B<CODE>raidtab</CODE> $B%U%!%$%k$r=$@5$7!"(B<CODE>failed-disk</CODE> $B$H$5$l$F$$$?%G%#%9%/$rIaDL$N(B RAID $B%G%#%9%/$H$7$^$9!#<!$K(B raidhotadd $B%3%^%s%I$G$=$N%G%#%9%/$r(B RAID $B$KAH$_9~$_$^$9!#(B</LI>
<LI>$B%G%0%l!<%I%b!<%I$8$c$J$$!J$^$H$b$J!K(BRAID $B$+$i%V!<%H$9$k$3$H$,$G$-$k%7%9%F%`$,$G$-$F$$$k$O$:$G$9!#(B</LI>
</UL>
<P>
<P>
<H2><A NAME="ss4.13">4.13 RAID $B$G%V!<%H$9$k%7%9%F%`$r:n$k(B</A>
</H2>

<P>$B%k!<%H%U%!%$%k%7%9%F%`$r%^%&%s%H$9$k$3$H$,$G$-$k%+!<%M%k$N$?$a$K!"%k!<%H%U%!%$%k%7%9%F%`$,CV$+$l$k%G%P%$%9$NA4$F$N%5%]!<%H$O%+!<%M%k$KAH$_9~$^$l$F$$$J$1$l$P$J$j$^$;$s!#$7$?$,$C$F!"(BRAID $B%G%P%$%9>e$G%k!<%H%U%!%$%k%7%9%F%`$r%^%&%s%H$9$k$?$a$K$O!"%+!<%M%k$K(B RAID $B%5%]!<%H$,AH$_9~$^$l$F(B<EM>$B$$$J$1$l$P(B</EM>$B$J$j$^$;$s!#(B
<P>$B%+!<%M%k$+$i(B RAID $B%G%P%$%9$,8+$($k$3$H$r3NG'$9$kIaDL$NJ}K!$O!"C1$KA4$F$NI,MW$J(B RAID $B%5%]!<%H$rAH$_9~$s$G%+!<%M%k$r%3%s%Q%$%k$9$k$3$H$G$9!#(BRAID $B%5%]!<%H$r%m!<%@%V%k%b%8%e!<%k(B<EM>$B$G$O$J$/(B</EM>$B!"%+!<%M%k(B<EM>$B$K(B</EM>$BAH$_$3$s$G$$$k$3$H$r3NG'$7$F$/$@$5$$!#%+!<%M%k$O%b%8%e!<%k$N%m!<%I$r(B($B%k!<%H%U%!%$%k%7%9%F%`$+$i(B)$B%k!<%H%U%!%$%k%7%9%F%`$,%^%&%s%H$5$l$kA0$K9T$J$&$3$H$O$G$-$^$;$s!#(B
<P>$B$7$+$7(B RedHat 6.0 $B$+$i$O%b%8%e!<%k$H$7$F?7$7$$(B RAID $B%5%]!<%H$r;}$D%+!<%M%k$,4^$^$l$F$$$^$9$+$i!"$3$3$G$O$I$N$h$&$KI8=`$N(B RedHat 6.0 $B%+!<%M%k$G(B RAID $B>e$+$i%7%9%F%`$r%V!<%H$5$;$k$+$K$D$$$F5-=R$7$^$9!#(B
<P>
<H3>$B%b%8%e!<%k$r;HMQ$7$F(B RAID $B$G%V!<%H(B</H3>

<P>$B%V!<%H$5$;$k$?$a$K$O!"(BLILO $B$K(B RAM $B%G%#%9%/$r;H$&$h$&$K;X<($9$kI,MW$,$"$j$^$9!#!V%k!<%H%Q!<%F%#%7%g%s$r%^%&%s%H$9$k$N$KI,MW$JA4$F$N%+!<%M%k%b%8%e!<%k$r4^$s$G$$$k(B RAM $B%G%#%9%/$r$D$/$l!W$H$$$&(B <CODE>mkinitrd</CODE> $B%3%^%s%I$r;H$$$^$9!#(B
<P>$B$3$N$h$&$K$7$^$9!#(B
<P>
<PRE>
 mkinitrd --with=&lt;module&gt; &lt;ramdisk name&gt; &lt;kernel&gt;
</PRE>

$B6qBNE*$K$O!"$3$N$h$&$K$J$j$^$9!#(B
<PRE>
 mkinitrd --with=raid5 raid-ramdisk 2.2.5-22
</PRE>
<P>$B$3$l$K$h$j!"%+!<%M%k$,%k!<%H%G%P%$%9$r%^%&%s%H$9$k$?$a$KI,MW$J(B RAID $B%b%8%e!<%k$,%V!<%H;~$KB8:_$9$k$3$H$,J]>Z$5$l$^$9!#(B
<P>
<P>
<H2><A NAME="ss4.14">4.14 $BMn$77j(B</A>
</H2>

<P>$B7h$7$F!"7h$7$F!"(B<B>$B7h$7$F(B</B>$B!"2TF/$7$F$$$k(B RAID $B$N0lIt$G$"$k%G%#%9%/$N%Q!<%F%#%7%g%s$N@Z$jD>$7$r$7$F$O$$$1$^$;$s!#(BRAID $B$N0lIt$G$"$k%G%#%9%/>e$N%Q!<%F%#%7%g%s%F!<%V%k$rJQ99$9$kI,MW$,$"$k$N$J$i!":G=i$K%"%l%$$r;_$a$^$9!#$=$N8e$K%Q!<%F%#%7%g%s$r@Z$jD>$9$N$G$9!#(B
<P>$BHs>o$KB?$/$N%G%#%9%/$r%P%9>e$KIU$1$k$3$H$O4JC1$G$9!#IaDL$N(B Fast-Wide SCSI $B%P%9$O(B 10 MB/s $B$r%5%]!<%H$G$-$^$9$,!"$3$l$O:#F|$G$O$[$H$s$I$N%G%#%9%/C1FH$G$N@-G=$h$j$b>/$J$$CM$G$9!#$=$s$J%P%9$K%G%#%9%/$r(B 6 $BBfCV$$$F$b4|BT$7$?%Q%U%)!<%^%s%9$O=P$^$;$s!#(B
<P>SCSI $B%P%9$,%P%9>e$N%G%#%9%/$NG=NO$G$[$H$s$IK~GU$K$J$k$h$&$J$i!"(BSCSI $B%3%s%H%m!<%i$rJ#?t$K$9$k$3$H$,!"@-G=8~>e$NM#0l$NJ}K!$H$J$j$^$9!#(B2 $BBf$N8E$$(B SCSI $B%G%#%9%/!J(B1$BBf$N%3%s%H%m!<%i>e$G(B 2$BBf$N%G%#%9%/$rAv$i$;$k$3$H$G$J$/$F!K$G!"(B2 $BKg$N(B 2940 $B$r;H$C$F$b@-G=8~>e$O8+$i$l$^$;$s!#(B
<P>persistent-superblock $B%*%W%7%g%s$rK:$l$?>l9g!"Dd;_$5$;$?8e$O$&$^$/5/F0$7$J$/$J$k$+$b$7$l$^$;$s!#(Braidtab $B$G%*%W%7%g%s$r@5$7$/%;%C%H$7$J$*$7$F!"%"%l%$$r:F9=@.$7$F$/$@$5$$!#(B
<P>RAID-5 $B$G%G%#%9%/$,30$5$l!":FA^F~8e$K:F9=C[$,<:GT$9$k>l9g!"$=$l$O(B raidtab $B$NCf$N%G%P%$%9$N=g=x$N$?$a$+$b$7$l$^$;$s!#:G=i$N!V(Bdevice...$B!W$H!V(Braid-disk...$B!W$N%Z%"$r(B raidtab $B%U%!%$%k$NCf$N%"%l%$$K4X$9$k5-=R$N2<$NJ}$XF0$+$7$F$_$F$/$@$5$$!#(B
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