RAID 5 configuration

If all 4 drives were sitting in RAID5 you'd have 1.5TB (well, less than that after formatting, but anyway...).

I have no idea how you've come to have what you have

Maybe post some screen shots from disk utility for us to see?

 

If you did it in software, you have RAID 0, 1 or 0+1 NOT RAID 5.

You'd need to have the optional RAID card to enable RAID 5 - and, as the other poster says, you'd get 1.5 TB with 4 drives, or 1TB with 3.

 

Looks OK in Raid Utility...

The 1.19 TB shown for the R0-1 RAID set is what you get formatted for the raw 1.5 TB (500 Gig being used for redundancy/parity from your original 4 x 500 G drives). This is exactly what my RAID is being set up as right now (about 2/3 of the way through the process -- what is the convention for an "impatient" smile?)

 

It's two, two, two volumes in one [set]

Oh, that bit about the 750GB "free space volume"? One of the options when you migrated the original 1 drive to a 4 drive RAID 5 was to use the additional space for a new volume (this is not particularly clear in Raid Utility ...). This gives you a startup volume equivalent in space to your original one drive (but striped over the RAID), plus another (751.33 = 1.19T - 465G...) that you can use for other stuff (in my case, media data that will be backed up separately from the boot partition.) There is really just one RAID set that is divided into two. I don't know if you can "migrate" that back to a single volume (without having to save/restore the data) if that is what you had intended to do.

 

On a different note, I have migrated my drive 3 and 4 into a RAID Set of 0. If I want to combine Drive 1 and 2 making this a RAID 0+1, do I need to delete the RAID 0 set and start over or can I just select my Drive 1 and tell it to combine Drive 2 and the new RAID Set to achieve what I wanted? In other words, will I need to start over or am I still o.k.? Anyone?