I currently have two 60GB SSDs in a RAID 0 array (through Disk Utility), in addition to my 1.5TB HDD. Does anyone know if it's possible to use 2 SSDs / 1 HDD with Fusion Drive? Or would I have to choose just 1 SSD and do the usual method?
It'd be awesome to make a Fusion Drive with 2 RAID0 SSDs and a hard drive, but I'm guessing Apple hasn't allowed complex setups like that.
Yes, you can use a softRAID as a physical volume. I've tested that it's possible, haven't been able to do practical setup for one yet and benchmark it. Diskutil will treat a RAID just the same as a single disk when creating a LVG. Mirrors work as well, it can lose one on the fly and not have a problem. Theoretically you could even fuse a set of mirrored SSDs and mirrored HDD's for speed and redundancy.
I've been planning on throwing a 2nd SSD into my iMac and test this practically but if you've got the hardware for it now, give it a shot and let me know how well it works practically.