Technical information
26 EqualLogic Configuration Guide | Version 15.2 | August 2014
7.2 RAID 10 drive layouts and total reported usable storage
Using a RAID 10 policy, Table 7 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 7 RAID 10 drive layouts and total reported usable storage available with hot spares (in GB)
Disk drives
Hot spare
No hot spare
6
4 Data (2 mirrors) + 2 Hot-spares
6 Data (3 mirrors)
7
6 Data (3 mirrors) + 1 Hot-spare
N/A
(a)
8
6 Data (3 mirrors) + 2 Hot-spares
8 data (4 mirrors)
12
(c)
10 Data (5 mirrors) + 2 Hot-spares
12 data (7 mirrors)
14
12 Data (6 mirrors) + 2 Hot-spares
14 data (7 mirrors)
16
14 Data (7 mirrors) + 2 Hot-spares
16 data (8 mirrors)
24
(c)
22 Data (11 mirrors) + 2 Hot-spares
24 data (12 mirrors)
48
46 Data (23 mirrors) + 2 Hot-spares
N/A
(b)
(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 / Size
50
(a)
100
(a)
74
146
250
300
400
450
500
600
750
1000
2000
3000
7
(b)
-
-
-
-
666
-
-
-
-
-
-
-
-
-
8
(c)
-
-
-
-
666
-
-
-
-
-
-
-
-
-
14
(d)
-
-
395
-
1333
-
2135
-
2671
-
4013
-
-
-
16
309
621
-
913
1556
1867
2492
2805
3117
3744
4683
6247
12749
19230
48
-
-
-
-
-
-
-
-
10647
12779
-
21306
40840
63191
Total reported usable storage when using hot spares: PS41x0/PS61x0
Disk 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
(e) PS6100S (SSD) only