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I'm not quite sure what your question is, but everything you showed seems to be normal.
Your disk /dev/cciss/c0d0 has 10 partitions. One of them is swap and one of them is the Extended partition. The remaining 8 are 'normal' partitions, and all of them seem to be mounted, as you say. (Actually I just see that there is a second hard disk with one partition. So out of 9 mountable partitions, 8 are used. Either df or mount will show you which ones)
The Extended partition is just a container for the partitions 5-10. It's a relict from DOS times, to overcome the limit of only 4 partitions per disk. (Have a look at the Start and End values)
PS: From the unusual device names I would guess that these are devices on a raid controller, so /dev/cciss/c0d0 and /dev/cciss/c0d1 are probably not single physical disks but raid volumes consisting of several physical disks.
I don't know what this notation is: "c0d0p1" What kind of a system are you using?
It APPEARS that the partition numbering follows the conventions most often seen--to wit:
4 primary partitions are allowed
To have more than 4 partitions, you need one of the 1st 4 to be an "extended" partition--hence your p4 extended
Any partition with a number higher than 4 is always a logical partition
filesystem tools will typically not report on extended partitions or swap space
partitioning tools will show the swap partition, but not always the extended
Note that an "extended partition" is really the begininning of a linked list. At each step in the list, there is another extended partition which points to the next logical. You can't set up a filesystem or store data in an extended partition.