Why is my new 10TB Mirrored RAID array only showing 1.8TB total space?

I have 5ea. 2TB Western Digital hard drives in a FirmTek 5PM enclosure connected via eSATA to my Mac Pro (April 2007 model). Running Leopard 10.5.8.
I used Apple Disk Utility to set up a Mirrored Raid using MacOS Extended (Journaled) and have a check mark by "Automatically Rebuild Raid Mirror Sets." My Raid Block size is 128K.
So, by all accounts I should have more than the 1.8TB showing as available space on this array.
Here is how it looks in my Disk Utillity app (link to smug pic of Disk Uility window): http://richardbrackin.smugmug.com/Other/blogpics/RAID/754262625_iffPY-S.jpg
I found a site here: http://blog.scottmroberts.com/archives/15 that discusses removing a GPT header but that doesn't sound like a good idea.
How do I get more capacity? I have clearly done something wrong.

Oh, you have mirrored one drive with 4 others creating a single 2 TB array consisting of one main member and four mirrors. I doubt this is your intended result. If you want a 10 TB RAID, then you want a "striped" not a "mirrored" RAID.
Now, you can make a striped RAID of one pair of drives, another striped RAID with another pair, then create a mirrored RAID of the two RAIDs. This would give you a 4 TB mirrored array. But the only way to use all five drives in a single array is a 5 drive striped RAID. To learn more about RAIDs see:
RAID Basics
For basic definitions and discussion of what a RAID is and the different types of RAIDs see RAIDs. Additional discussions plus advantages and disadvantages of RAIDs and different RAID arrays see:
RAID Tutorial;
RAID Array and Server: Hardware and Service Comparison>.
Hardware or Software RAID?
RAID Hardware Vs RAID Software - What is your best option?
RAID is a method of combining multiple disk drives into a single entity in order to improve the overall performance and reliability of your system. The different options for combining the disks are referred to as RAID levels. There are several different levels of RAID available depending on the needs of your system. One of the options available to you is whether you should use a Hardware RAID solution or a Software RAID solution.
RAID Hardware is always a disk controller to which you can cable up the disk drives. RAID Software is a set of kernel modules coupled together with management utilities that implement RAID in Software and require no additional hardware.
Pros and cons
Software RAID is more flexible than Hardware RAID. Software RAID is also considerably less expensive. On the other hand, a Software RAID system requires more CPU cycles and power to run well than a comparable Hardware RAID System. Also, because Software RAID operates on a partition by partition basis where a number of individual disk partitions are grouped together as opposed to Hardware RAID systems which generally group together entire disk drives, Software RAID tends be slightly more complicated to run. This is because it has more available configurations and options. An added benefit to the slightly more expensive Hardware RAID solution is that many Hardware RAID systems incorporate features that are specialized for optimizing the performance of your system.
For more detailed information on the differences between Software RAID and Hardware RAID you may want to read: Hardware RAID vs. Software RAID: Which Implementation is Best for my Application?
Actually as I squinted at your tiny image I'm sure you never actually created a RAID. You have one 2 TB drives that are not properly arrayed with any of the other four drives.
Message was edited by: Kappy

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Why is my new 10TB Mirrored RAID array only showing 1.8TB total space?

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