MegaRAID JBOD substitute

Are you trying to use the card for a software RAID solution like ZFS? Which controller are you using? If this is the case, using multiple RAID-0 logical drives will create an ugly situation if you need to swap a failed disk. The replacement drive will not be recognized until you reboot/reinitialize a new RAID-0 array containing the failed disk. It's not worth it. Use a proper HBA if possible, OR use the hardware RAID functions of the controller with ZFS (sometimes it makes sense).

Please refer to: ZFS SAS/SATA controller recommendations

Don't do this with 24 drives. Get a different controller. Anything based on the LSI 1068e (which is a bottom-of-the-line option for many Dell and IBM servers) will support JBOD. Dell calls it a SAS 6/iR and IBM calls it a ServeRAID BR10i.

Untrue! Some of the MegaRAID cards (such as the raid controller that IBM rebrands as the M1015) do support JBOD passthru.

If you want to use JBOD mode I'd suggest these cards. Know a local IBM VAR? I'd recommend getting friendly with them - odds are they have a whole mess of these cards on hand.