The EMULATION type refers to the type of device. Open systems requires a Fixed Block Architecture (FBA) device, while Mainframe needs Count-Key-Data (CKD) for example. So it is the EMULATION type that describes this.  You're right about the protection type relating to RAID. With RAID the costs and benefits come in 3 different areas: - Protection level. How well is the data protected at the hardware level. In other words the likelihood of data loss in a multiple hard drive scenario. - Performance. The amount of overhead in performing write operations. A single host write, generates 2 disk writes for RAID1, 4 for RAID 5 and 6 for RAID 6. - Capacity. The storage capacity overhead in providing data protection. raid 1 = 100%, raid 5/6 25% or 12.5% depending on the number of devices in the raid set.
Hi everyone,  Maybe it is not the place to ask for this but as I found it reading the VMAX documentation, maybe someone can post me a link where I can find more information about these two concepts which keep appearing:  EMULATION type  I really have no idea what it means, does the VMAX emulates some kind of storage layout (defining the allocation unit and other features...)? What could be the benefit of using one emulation type instead of other?  PROTECTION type  Does it has to do with the RAID level? again, what benefits could provide using one instead of other (if it is RAID I know [IMAGE] )?  Thank you in advance
More information about emulation and protection type