Question to the question: You asked 'how to partition 22TB disk' and then in the question again, you said, you just wanted a 22TB partition. So this is ambiguos in first place.
If you already have a single block device which can support 22TB of space on it, then you already posses whole 22TB partition. All you need is a filesystem on top of it, which will make the device mountable and usable for reading/writing by system processes. More ever, you need to have a Linux kernel running in 64-bit mode with a filesystem module/driver that supports and scales to 22TB of data growth, can handle the ins and outs of managing the data on the (single) block device with ease. Performance is altogether another dimension to it. In such case, I would opt to choose
XFS as my filesystem, for the reason that it is a 64-bit filesystem and capable of handling filesystems as large as a million terabytes. It supports upto 9 EXABYTES.
2^63 = 9 x 1018 = 9 exabytes
For more details on XFS: http://oss.sgi.com/projects/xfs/
If you are looking for further partitioning the huge 22TB block device, then use
gparted to split the device into usable partitions and then format them with the filesystems to make them mountable.
It seems that you have got hardware RAID controller, since you mention that you have got DELL perc RAID controller -- which will mean that, you have to tell which RAID configuration (precisely which RAID level are you using?) and in most cases, you are not going to get complete 22TB of space for use, I could be wrong though.