Re: [cobalt-users] Raq4i or Raq4r

[Gerald Waugh <gwaugh@xxxxxxxxxxxxxxxxxxxxxxx>]

On Thursday 04 July 2002 11:53 am, Michelle Hall-Jones wrote:
> Hi
>
> Can you point me in the direction of "a little more work to run raid"
> besides running the osrcd?
>
These instrucitons have never been used on a RaQ and there is no guarantee 
that they will not render your system useless, particularly if you err.
Then you will have to run the OSRCD..

1) Is your second drive hdc (a master)?
    if not strap it as a master to make it hdc

2) make a file /etc/raidtab (paste following data into it)

raiddev           /dev/md1
raid-level        1
nr-raid-disks     2
nr-spare-disks    0
chunk-size        4
device            /dev/hda1
raid-disk         0
device            /dev/hdc1
raid-disk         1

raiddev           /dev/md3
raid-level        1
nr-raid-disks     2
nr-spare-disks    0
chunk-size        4
device            /dev/hda3
raid-disk         0
device            /dev/hdc3
raid-disk         1

raiddev           /dev/md4
raid-level        1
nr-raid-disks     2
nr-spare-disks    0
chunk-size        4
device            /dev/hda4
raid-disk         0
device            /dev/hdc4
raid-disk         1

raiddev           /dev/md6
raid-level        1
nr-raid-disks     2
nr-spare-disks    0
chunk-size        4
device            /dev/hda6
raid-disk         0
device            /dev/hdc6
raid-disk         1

3) run the following commands
    they will initilize hdc
    As you run each command look at /proc/mdstat file. It should tell you
    that the /dev/mdX device has been started, that the mirror is being 
    reconstructed, and an ETA of the completion of the reconstruction. 
# mkraid -f /dev/md0 
# mkraid -f /dev/md3
# mkraid -f /dev/md4
# mkraid -f /dev/md6

4) vi /etc/rc.d/rc.sysinit 
    find (if not there) add this section or remove the 
    section that is there and add this secion
# Add raid devices
if [ -f /proc/mdstat -a -f /etc/raidtab -a -x /etc/rc.d/rc.raid ]; then
        echo "Starting up RAID devices..."
        echo
        . /etc/rc.d/rc.raid
        echo
        echo

        # A non-zero return means there were problems.
        if [ $? -gt 0 ]; then
                echo
                echo "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!"
                echo "!!                                       !!"
                echo "!! An error occurred during RAID startup !!"
                echo "!!                                       !!"
                echo "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!"
                echo

                LINE1=`getmsg raid_fail_1`
                LINE2=`getmsg raid_fail_2`
                $LCD_STOP >& /dev/null
                $LCD_SWRITE -s "$LINE1" "$LINE2" &>/dev/null &
                sleep 10

                echo
                echo "Automatic reboot in progress..."
                echo "Unmounting file systems"
                echo
                LINE1=`getmsg reboot_1`
                LINE2=`getmsg reboot_2`
                $LCD_STOP >& /dev/null
                $LCD_SWRITE -s "$LINE1" "$LINE2" &>/dev/null &
                sleep 2

                umount -a
                mount -n -o remount,ro /
                reboot
        fi
        # reset lcd message
        LINE1=`getmsg checking_disk_1`
        $LCD_STOP >& /dev/null
        $LCD_SWRITE -s "$LINE1" "" &>/dev/null &
fi

5) The partition-types of the devices used in the RAID must be set to 
    0xFD(use fdisk and set the type to ``fd'')
# raidstop /dev/md0
# raidstop /dev/md3
# raidstop /dev/md4
# raidstop /dev/md6
# fdisk /dev/hda
Command (m for help): p
look at the partitions, with id 83
you must change those to "fd" (no "")
Use the 't' command to change the id
Now do the same thing with hdc
#fdisk /dev/hdc

OK, you're done, reboot and then 
cat /etc/mdstat and you should see raid runing

BE CAREFUL

-- 
Gerald Waugh 
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