RAID 1+0 vs. 5 performance HELP!!

I'm trying to understand a little more about the RAID configuration options
we're evauluating..

One option we have available is Raid 1+0:

1+0 = Raid 10 = Striping over mirror sets... With (4) 72.4 GB disks, this
type of configuration will yield 145 GB of usable disk.......

A Raid 5 config, will yield 217 GB..... I'm wondering if RAID 5 will yield
FASTER performance with only 4 disks... Follow me here...knowing we have
four disks to work with:

In a RAID 5 config, data will be written across 3 disks, then parity
computed and written to a fourth drive..

In a 1+0 config, data will be striped across two disks, then mirrored across
two more disks.

Think about a 10 Meg file written to these arrays... In a raid 5 config,
3.3 GB would be written to each of the 3 disks, then parity info to the 4th,
right??? In the 1+0 config, the system has to write 5 GB to each disk, then
mirror it... More data is written PER DISK?

Am I way off course here??? I'm not very familiar with Raid technologies
other than the 0, 1, and 5 standards...


Thanks,
Troy


.

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