Dell PS4100 Technical Information download pdf (Page 24)

June 2012 Dell EqualLogic Configuration Guide v13.2 18

Table 8 shows the drive layouts that are enforced when using a RAID 5 policy based on the number of

drives in each array/hot spare configuration, and the total usable storage available for each model.

Table 8 RAID 5 Drive Layouts and Total Storage Available with Hot Spares (in GB)

Disk

Drives

Hot Spare

No Hot Spare

5 Data/Parity + 1 Hot Spare

RAID Policy for RAID 5 without a hot spare is

not supported

6 Data/Parity + 1 Hot-spare

7 Data/Parity + 1 Hot-spare

(a)

11 Data/Parity + 1 Hot-spare

13 Data/Parity + 1 Hot-spare

15 Data/Parity + 1 Hot-spare

(a)(b)

23 Data/Parity+ 1 Hot-spare

(b)

46 Data/Parity + 2 Hot-spares

(a)

PS4100/PS6100 models only

(b)

24 and 48 drive arrays implement multiple RAID 5 sets within a chassis

Total Usable Storage Available: All Models Prior to PS4100/PS6100

Disk

Drive

Qty /

Size

(a)

100

(a)

74 146 250 300 400 450 500 600 750 1000 2000 3000

(b)

- - - 1193 - - - - - - - - -

(c)

- - - 1432 - - - - - - - - -

(d)

- 851 - 2868 - 4597 - 5749 - - - - -

667 1336 - 1962 3348 4020 5364 6037 6709 8053 10070 13430 - 41297

- - - - - - - 20887 25067 - 41786 80079 123903

Total Usable Storage Available: PS4100/PS6100

Disk

Drive

Qty /

Size

146

200

(e)

300

400

(e)

500 600 900 1000 2000 3000

- - - - 1913 2286 - 3826 7817 11819

1396 1979 2869 3969 4782 5750 8631 9587 19527 29499

2946 4167 6036 8345 10071 12083 18097 20110 41000 61957

(a)

Solid State Disk

(b) Legacy PS50E

(d) Legacy PS70E,PS100E, PS100X, PS200E and PS300E

(e) PS6100S (SSD) only

2.4.2 RAID 6 Drive Layouts and Total Usable Storage

RAID6 (striped set with dual distributed parity) combines N disks in an arrangement where each stripe

consists of N-2 disks containing data blocks and 2 disks containing parity blocks. Each parity block

generates parity using a different view of the data blocks depending on the RAID 6 implementation.

RAID 6 can tolerate up to 2 drive failures per RAID set at the same time without data loss. RAID 6 is not

recommended for workloads consisting mainly of random writes. Using a RAID 6 policy, Table 9

1 2 ... 19 20 21 22 23 24 25 26 27 28 29 ... 97 98

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