Rank Array Data Section

There is one section per rank in a extent pool.

Offsets		Name	Length	Format	Description
0	0	R748AAID	2	binary	Rank array identifier.
2	2	R748ARID	2	binary	Rank identifier.
4	4	R748AEBC	16	EBCDIC	Description of array type, for example: RAID-10.
20	14	R748ATYP	1	binary	Array type: Value Meaning 1 RAID-5 2 RAID-10 3 RAID-6
21	15	R748AASP	1	binary	Array speed in 1000 RPM.
22	16	R748AAWD	2	binary	Array width.
24	18	R748AACP	4	binary	Array capacity in GB.
28	1C	R748AAST	1	binary	Array device class and array status Bit Meaning when set 0-1 Device class B'00' = Enterprise drive B'01' = Near-line drive B'10' = SATA drive B'11' = Solid state drive 2 Raid degraded 3 DDM throttling 4 RPM exception 5-7 Reserved.