RHCE exam requires you to be able to create a RAID array on a running system, as well as with the installer.
I won’t explain here how to deal with the installer as it’s pretty easy.
1. create the partitions
Using fdisk or else Set the ID type to “fd” (Linux RAID autodetect)
Say we got here /dev/hda2 and /dev/hdb2
2. create the RAID array with the first drive only
mdadm –create /dev/md0 –level=1 –raid-devices=2 /dev/hda2 missing
That’s my way of dealing with the creation of an array. You can obviously create the array with the 2 drives now.
3. Formatting the new array in ext3
mke2fs -j -c /dev/md0
-j for ext3 -c for check
4. Adding the other drive to the array
mdadm –add /dev/md0 /dev/hdb2
You should hear the drives working. They are actually synching Type : cat /proc/mdstat to see what is actually happening.
5. Edit fstab
Add a line to get the array mounting when the system boots
/dev/md0 /raid ext3 defaults 0 2