March 2013 Dell EqualLogic Configuration Guide v14.1 4-33
4.3 RAID 50 drive layouts and total reported usable storage
Table 13 shows the drive layouts that are enforced when using a RAID 50 policy based on the number
of drives in each array/hot spare configuration and the total usable storage available for each model.
RAID 50 (RAID 5 sets in a striped set) is created by first creating two or more RAID 5 sets and then
striping data over those RAID5 sets. RAID 50 implementations can tolerate a single drive failure per
RAID5 set.
Table 13 RAID 50 drive layouts and total reported usable storage available with hot spares (in GB)
Disk drives Hot spare No hot spare
5 Data/Parity + 1 Hot-spare
6 Data/Parity + 1 Hot-spare
6 Data/Parity + 2 Hot-spares
10 Data/Parity + 2 Hot-spares
12 Data/Parity + 2 Hot-spares
14 Data/Parity + 2 Hot-spares
22 Data/Parity + 2 Hot-spares
46 Data/Parity + 2 Hot-spares
(a) RAID 50 requires an even number of disk drives. A 7 drive configuration without hot-spare would result in odd
number of disk drives.
(b) 48 drive arrays implement stripes across multiple RAID 5 sets within a single chassis.
(c) 48 drive arrays cannot implement a no hot-spare policy.
(d) PS4100/PS6100 models only
Total reported usable storage when using hot spares: All models prior to PS4100/PS6100
Disk
Drive
50
(a)
100
(a)
74 146 250 300 400 450 500 600 750 1000 2000 3000
- - - - 888 - - - - - - - - -
- - - - 888 - - - - - - - - -
- - 660 - 2224 - 3566 - 4460 - 6695 - - -
532 1066 - 1566 2671 3207 4280 4817 5353 6427 8037 10719 21819 32972
- - - - - - - - 18062 21677 - 36136 69260 107151
Total reported usable storage when using hot spares: PS41x0/PS61x0
Drive
Qty / Size
146 200
(e)
300
400
(e)
500 600 900 1000 2000 3000
6
- - - - 1781 2129 - 3563 7280 11008
12
1044 - 2129 2949 3563 4280 6430 7137 14571 21975
14
1304 - 2670 - 4459 5353 8036 8930 - -
24
2355 3328 4815 6666 8038 9646 14474 16087 32727 49455
(a)
Solid State Disk
(b) Legacy PS50E
(c) PS4000E and PS6000E only
(d) Legacy PS70E,PS100E, PS100X, PS200E and PS300E