I can't say I've personally ever worked on one of those HPE SAN units. Nothing in the documentation that I'm seeing seems to suggest anything beyond a regular RS RAID 6, but it's hard to be sure. I know some other brands like EMC like to use a sort of diagonal parity rather than a Reed-Solomon parity block, so it's certainly possible.
But, even a relatively "standard" RAID 6 can be tough to figure out. Sometimes it's P before Q, other times it's Q before P. There's wide-stance, parity delay, left-symmetric rotation, left-asymmetric, right-symmetric...etc. etc. etc. in addition to the basics like block size and drive order.
So even if it is pretty standard, not usually an easy task.
De-striping the array can probably be done using R-Studio or UFS Explorer Professional. But, even if you get that far, you'll probably have to deal with carving out the virtual disks the SAN was using and hope that they aren't badly fragmented (which can be severe is you thin provision on the SAN with multiple VDs.)
