March 2013 Dell EqualLogic Configuration Guide v14.1 4-32
4.2 RAID 10 drive layouts and total reported usable storage
Using a RAID 10 policy, Table 12 shows the drive layouts that are enforced based on the number of
drives in each array/hot spare configuration, and the total usable storage available for each model.
RAID 10 (mirrored sets in a striped set) combines two high performance RAID types: RAID 0 and RAID
1. A RAID 10 is created by first building a series of two disk RAID 1 mirrored sets, and then distributing
data over those mirrors. RAID 10 implementations can tolerate one drive failure per mirror pair.
Table 12 RAID 10 drive layouts and total reported usable storage available with hot spares (in GB)
Disk drives Hot spare No hot spare
4 Data (2 mirrors) + 2 Hot-spares
6 Data (3 mirrors) + 0 Hot-spare
6 Data (3 mirrors) + 1 Hot-spare
6 Data (3 mirrors) + 2 Hot-spares
10 Data (5 mirrors) + 2 Hot-spares
12 Data (6 mirrors) + 2 Hot-spares
14 Data (7 mirrors) + 2 Hot-spares
22 Data (11 mirrors) + 2 Hot-spares
46 Data (23 mirrors) + 2 Hot-spares
(a) Not supported. An even number of drives is required by RAID 10
(b) 48 drive arrays cannot implement a no hot-spare policy.
(c) PS4100/PS6100 models only
Total reported usable storage when using hot spares: All models prior to PS4100/PS6100
Disk
drive
qty /
50
(a)
100
(a)
74 146 250 300 400 450 500 600 750 1000 2000 3000
- - - - 666 - - - - - - - - -
- - - - 666 - - - - - - - - -
- - 395 - 1333 - 2135 - 2671 - 4013 - - -
309 621 - 913 1556 1867 2492 2805 3117 3744 4683 6247 12749 19230
- - - - - - - - 10647 12779 - 21306 40840 63191
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
- - - - 887 1064 - 1781 3635 5498
12
650 920 1331 1843 2222 2672 4014 4454 9103 13762
14
781 - 1599 - 2670 3207 4816 5353 - -
24
1433 2027 2938 4065 4904 5888 8841 9820 19998 30221
(a)
Solid State Disk
(b) Legacy PS50E
(c) PS4000E and PS6000E only
(d) Legacy PS70E,PS100E, PS100X, PS200E and PS300E