Raid 50 - Dell PS4000 Configuration Manual

Disk Drive
(a)
50
Qty / Size
(b)
7
-
(c)
8
-
(d)
14
-
16
350
48
-
(a) Solid State Disk
(b) Legacy PS50E
(c) PS4000E and PS6000E only
(d) Legacy PS70E,PS100E, PS100X, PS200E, PS300E and PS400E
Table 10: RAID 10 Total Storage Available with Hot Spares (in GB)
2.4.4

RAID 50

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.
For EqualLogic arrays using a RAID 50 policy, Table 11 shows the drive layouts that are enforced based
on the number of drives in each array and the hot spare configuration.
Disk
Drives
7
8
14
16
(b)
48
(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.
Table 11: RAID 50 Drive Layouts
For EqualLogic arrays using a RAID 50 policy, the total quantity of raw storage available can be
computed based on number of drives and the hot spare configuration. The Table 12 below shows the
amount of raw storage available using the hot spare drive layouts specified in Table 11 above.
Dell EqualLogic Configuration Guide v11.3
(a)
100 74 146 250
- - - 750
- - - 750
- 444 - 1500
700 - 1022 1750
- - -
Hot Spare
6 Data/Parity
1 Hot-spare
6 Data/Parity
2 Hot-spares
12 Data/Parity
2 Hot-spares
14 Data/Parity
2 Hot-spares
46 Data/Parity
2 Hot-spares
300 400 450
- - -
- - -
- 2400 -
2100 2800 3150
- - - -
No Hot Spare
8 Data/Parity
14 Data/Parity
16 Data/Parity
500 600 750
- - -
- - -
3000 - -
3500 4200 5250
11500 13800 -
(a)
N/A
(c)
N/A
1000 2000
- -
- -
- -
7000 -
23000 46000
12