Two separate RAID sets stacked up logically under one drive letter

[BigFunkyChief]

Here's my situation.

We currently have two 300GB SCSI320 drives (RAID 1) for our Graphics files. Typical files are around 200MB (30x42" posters, etc), and can get much larger very easily.

We also have five 74GB SCSI320 drives (RAID 5) for our architecture files. Lots of read/writes, but file sizes are very small, 5MB and under.

I chose the above config because the large files were significantly slower on the RAID5 setup than the RAID1. The small architecture files had fast access on either setup, so I chose the RAID5 for them for better redundancy.

Now we'd like to combine these files (logically) into one folder.

So we'll have a folder for the project, then under it a folder for Graphics and a folder for Architecture.

Obviously combining the files onto one physical disk would accomplish this, but performance will suffer tremendously.

How can I have two separate RAID sets stacked up logically under one drive letter? I can't see how it's possible, but I'm sure it is in some way.

Thanks in advance!!

"Rule #1 - When stumped, check your Event Logs!