IBM DS8880 Series Introduction And Planning Manual page 108

RAID 6 array capacities for standard drive enclosures
The following table lists the RAID 6 array capacities for fully populated storage
enclosures.
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DS8880 Introduction and Planning Guide
Table 40. RAID capacities for RAID 5 arrays (continued)
Total physical
Drive size and capacity (GB)
type per drive set
Notes:
1. Disk-drive and flash-drive sets contain 16 disk drives. Half-drive sets contain 8 disk
drives.
2. Physical capacities are in decimal gigabytes (GB) and terabytes (TB). One decimal GB is
1,000,000,000 bytes. One decimal TB is 1,000,000,000,000 bytes.
3. Rank capacities of DS8880 are different from rank capacities of earlier DS8000 storage
systems. This change in the number of extents must be planned for when you move or
migrate data to the DS8880.
Table 41. RAID capacities for RAID 6 arrays
Total physical
Drive size and capacity (GB)
type per drive set
300 GB disk 4,800
drives
400 GB 2.5-in. 6,400
flash drives
(SSD)
600 GB disk 9,600
drives
800 GB 2.5-in. 12,800
flash drives
(SSD)
1.2 TB disk 19,200
drives
1.6 TB 2.5-in. 25,600
flash drives
(SSD)
Effective capacity in GB
(number of extents)
Fixed block
Rank with RAID 5 array
(FB) or count
1, 2
key data (CKD) 6 + P
Effective capacity in GB
(number of extents)
Fixed block (FB)
Rank with RAID 6 array
or count key
1, 2
data (CKD) 5 + P + Q
FB 1,347.55
(1,255)
CKD 1,331.98
(1,408)
FB 1,856.50
(1,729)
CKD 1,834.30
(1,939)
FB 2,750.93
(2,562)
CKD 2,718.82
(2,874)
FB 3,750.58
(3,493)
CKD 3,706.45
(3,918)
FB 5,541.58
(5,161)
CKD 5,475.48
(5,788)
FB 7,539.82
(7,022)
CKD 7,450.74
(7,876)
2, 3
7 + P
2, 3
6 + P + Q
1,628.87
(1,517)
1,610.10
(1,702)
2,241.97
(2,088)
2,214.60
(2,341)
3,318.94
(3,091)
3,279.80
(3,467)
4,521.53
(4,211)
4,467.98
(4,723)
6,676.53
(6,218)
6,597.44
(6,974)
9,081.71
(8,458)
8,974.75
(9,487)