IBM DS6000 Series manual CKD RAID rank capacity

Note: IBM plans to offer Capacity Magic for DS6000 in the future. Capacity Magic calculates the physical and effective storage capacity of a DS6000. IBM sales representatives and IBM Business Partners can download this tool from the IBM Web site. The values presented here are intended to be used only until Capacity Magic is available.

The following figures are for an 8 DDMs array. The user can also select a 4 DDMs array configuration.

CKD RAID rank capacity

	RAID	DDM	Array		Binary	Decimal	3390-3	3390-9	32760 cyl	65520 cyl
RAID type	type	capacity	Format	Extents	GB	GB	devices	devices	devices	devices
RAID10 73GB	RAID10	73GB	3+3+2S	213	187.66	201.50	71	23	7	3
RAID10 73GB	RAID10	73GB	4+4	284	250.21	268.67	94	31	9	4
RAID10 146GB	RAID10	146GB	3+3+2S	432	380.61	408.67	144	48	14	7
RAID10 146GB	RAID10	146GB	4+4	577	508.36	545.85	192	64	19	9
RAID10 300GB	RAID10	300GB	3+3+2S	880	775.31	832.48	293	97	29	14
RAID10 300GB	RAID10	300GB	4+4	1,174	1,034.34	1,110.61	391	130	39	19
RAID5 73GB	RAID5	73GB	6+P+S	428	377.08	404.89	142	47	14	7
RAID5 73GB	RAID5	73GB	7+P	500	440.52	473.00	166	55	16	8
RAID5 146GB	RAID5	146GB	6+P+S	773	681.04	731.26	257	85	25	13
RAID5 146GB	RAID5	146GB	7+P	1,011	890.73	956.41	337	112	33	17
RAID5 300GB	RAID5	300GB	6+P+S	1,765	1,555.03	1,669.70	588	196	58	29
RAID5 300GB	RAID5	300GB	7+P	2,059	1,814.05	1,947.83	686	228	68	34

Notes

There may be space left over when defining the devices shown in the table.

Devices that are not a multiple of 1113 cylinders will use additional space on the disk subsystem as the allocation unit is an extent of this size.

Figure 8-8 CKD RAID rank capacity (8 DDMs array)

140DS6000 Series: Concepts and Architecture