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<TITLE>Root RAID HOWTO cookbook: Building the RAID file system.</TITLE>
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<H2><A NAME="s6">6. Building the RAID file system.</A></H2>
<P>This description is for my RAID systems described in the system
specs. Your system may have a different RAID architecture, so
modify as appropriate. Please read the man pages and
QuickStart.RAID that come with the raidtools-0.42
<H2><A NAME="raid5configuration"></A> <A NAME="ss6.1">6.1 /etc/raid5.conf </A>
</H2>
<P>
<PRE>
# raid-5 configuration
raiddev /dev/md0
raid-level 5
nr-raid-disks 4
chunk-size 32
# Parity placement algorithm
parity-algorithm left-symmetric
# Spare disks for hot reconstruction
#nr-spare-disks 0
device /dev/sda3
raid-disk 0
device /dev/sdb3
raid-disk 1
device /dev/sdc3
raid-disk 2
device /dev/sdd3
raid-disk 3
</PRE>
<H2><A NAME="raid1configuration"></A> <A NAME="ss6.2">6.2 /etc/raid1.conf </A>
</H2>
<P>
<PRE>
# raid-1 configuration
raiddev /dev/md0
raid-level 1
nr-raid-disks 2
nr-spare-disks 0
device /dev/hda4
raid-disk 0
device /dev/hdc4
raid-disk 1
</PRE>
<H2><A NAME="ss6.3">6.3 Step by Step procedures for building production RAID file system.</A>
</H2>
<P>For my RAID5 system I did a complete install of:
<PRE>
Slackware-3.4 any current distribution should work OK
linuxthreads-0.71
raidtools-0.42
linux-2.0.33 with raid145 patch and Gadi's patch
</PRE>
<P>Create and format the raid device.
<PRE>
mkraid /etc/raid5.conf
mdcreate raid5 /dev/md0 /dev/sda3 /dev/sdb3 /dev/sdc3 /dev/sdd3
mdadd -ar
mke2fs /dev/md0
mkdir /md
mount -t ext2 /dev/md0 /md
</PRE>
Create the reference files that reboot will use,
this may be different on your system.
<PRE>
cat /proc/mdstat | grep md0 > /dosa/raidboot/raidgood.ref
cat /proc/mdstat | grep md0 > /dosb/raidboot/raidgood.ref
</PRE>
Use Slackware-3.4 or another distribution to build your OS
<PRE>
setup
</PRE>
Specify '/md' as the target, and the source whatever your normally use.
Select and install the disksets of interest except for the kernel.
Configure the system, but skip the section on lilo and kernel booting.
Exit setup.
<P>Install 'pthreads'
<PRE>
cd /usr/src/linuxthreads-0.71
</PRE>
edit the Makefile and specify
<PRE>
BUILDIR=/md
make
make install
</PRE>
Install 'raidtools'
<PRE>
cd /usr/src/raidtools-0.42
configure --sbindir=/md/sbin --prefix=/md/usr
</PRE>
fix the raidtools make install error
<PRE>
cd /md/sbin
rm mdrun
rm mdstop
ln -s mdadd mdrun
ln -s mdadd mdstop
</PRE>
Create /dev/mdx
<PRE>
cp -a /dev/md* /md/dev
</PRE>
Add the system configuration from the current system (ignore errors).
<PRE>
cp -dp /etc/* mnt/etc
cp -dp /etc/rc.d/* mnt/etc/rc.d (include the new rc.6)
mkdir mnt/lib/modules
cp -a /lib/modules/2.x.x mnt/lib/modules <--- your current 2.x.x
</PRE>
Edit the following files to correct them for your file system
<PRE>
cd /md
Non-network
etc/fstab correct for real root and raid devices.
etc/mdtab should work OK
Network
etc/hosts
etc/resolv.conf
etc/hosts.equiv and related files
etc/rc.d/rc.inet1 correct ip#, mask, gateway, etc...
etc/rc.d/rc.S remove entire section on file system status
from:
# Test to see if the root partition isread-only
to but not including:
# remove /etc/mtab* so that mount will .....
This avoids the annoying warning that
the ramdisk is mounted rw.
etc/rc.d/rc.xxxxx others as required
root/.rhosts if present
home/xxxx/xxxx others as required
WARNING: The above procedure moves your password and shadow
files onto the new file system!!!!!
WARNING: You may not wish to do this for security reasons.
</PRE>
Create any directories for mounting /dev/disk... as may be required
that are unique to your system. Mine need:
<PRE>
cd /md <--- new file system root
mkdir dosa dos partition mount point
mkdir dosb dos mirror mount point
</PRE>
The new file system is complete. Make sure and save the md reference
status to the 'real' root device and you are ready to boot.
<P>mount the dos partitions on dosa and dosb
<PRE>
cat /proc/mdstat | grep md0 > /dosa/raidboot/raidgood.ref
cat /proc/mdstat | grep md0 > /dosb/raidboot/raidgood.ref
mdstop /dev/md0
</PRE>
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