I have an IBM blade server and we've installed RedHat Linux on the machine.
How can we check if we have both disks running as a mirror, or if everything is only running on a single disk? What linux commands can I use to discover this?
If you are using software RAID, you can ask for the status of the disks:
You will get something like this (a mirrored pair plus a 3 disk RAID setup):
If, however, you are using a hardware RAID setup based on whatever disk controller/s your blade system has fitted then you will need to check out what utilities and/or firmware-based tools are available - for the latter you may need to reboot the server and press a key combination to enter a setup program, or perhap start the server from a configuration disc.