Technical information
28 EqualLogic Configuration Guide | Version 15.2 | August 2014
7.3 RAID 50 drive layouts and total reported usable storage
Table 8 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 8 RAID 50 drive layouts and total reported usable storage available with hot spares (in GB)
Disk drives
Hot spare
No hot spare
6
5 Data/Parity + 1 Hot-spare
N/A
(a)
7
6 Data/Parity + 1 Hot-spare
N/A
(a)
8
6 Data/Parity + 2 Hot-spares
8 data/parity
12
(d)
10 Data/Parity + 2 Hot-spares
12 data/parity
14
12 Data/Parity + 2 Hot-spares
14 data/parity
16
14 Data/Parity + 2 Hot-spares
16 data/parity
24
(d)
22 Data/Parity + 2 Hot-spares
24 data/parity
48
(b)
46 Data/Parity + 2 Hot-spares
N/A
(c)
(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
Qty / Size
50
(a)
100
(a)
74
146
250
300
400
450
500
600
750
1000
2000
3000
7
(b)
-
-
-
-
888
-
-
-
-
-
-
-
-
-
8
(c)
-
-
-
-
888
-
-
-
-
-
-
-
-
-
14
(d)
-
-
660
-
2224
-
3566
-
4460
-
6695
-
-
-
16
532
1066
-
1566
2671
3207
4280
4817
5353
6427
8037
10719
21819
32972
48
-
-
-
-
-
-
-
-
18062
21677
-
36136
69260
107151
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
-
-
-
-
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
(e) PS6100S (SSD) only