Why do you need to know on a server you don't have access to?
"cat /etc/fstab" will show you where partitions are meant to be mounted.
"cat /etc/mtab" or "mount" will show what's currently mounted where.
If you're root, you can also try "fdisk -l {device}" to see the partition layouts on different disks if that's what you want.
You might be able to get some information of any software RAID going on by looking at those, and almost certainly other places which I don't know of since I don't use software RAID, but I doubt you'll be able to find much if it's hardware RAID
