how to find if the disk is mirrored?
 

we have hp box and how do I find if the box is mirrored?

Here is the output of fdisk

/sbin/fdisk -l

Disk /dev/cciss/c0d0: 72.3 GB, 73369497600 bytes
255 heads, 63 sectors/track, 8920 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/cciss/c0d0p1 * 1 31 248976 83 Linux
/dev/cciss/c0d0p2 32 7863 62910540 83 Linux
/dev/cciss/c0d0p3 7864 8907 8385930 82 Linux swap

Check /etc/raidtab (raidtab is not present on a RedHat box I think) or /proc/mdstat for software raid.