Dell PS4100 Technical Information download pdf (Page 26)

June 2012 Dell EqualLogic Configuration Guide v13.2 20

2.4.3 RAID 10 Drive Layouts and Total Usable Storage

Using a RAID 10 policy, Table 10 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 10 RAID 10 Drive Layouts and Total 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 N/A

(a)

6 Data (3 mirrors) + 2 Hot-spares

8 data (4 mirrors)

(c)

10 Data (5 mirrors) + 2 Hot-spares

12 data (7 mirrors)

12 Data (6 mirrors) + 2 Hot-spares

14 data (7 mirrors)

14 Data (7 mirrors) + 2 Hot-spares

16 data (8 mirrors)

(c)

22 Data (11 mirrors) + 2 Hot-spares

24 data (12 mirrors)

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.

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)

- - - - 715 - - - - - - - - -

(c)

- - - - 715 - - - - - - - - -

(d)

- - 425 - 1432 - 2292 - 2868 - - - - -

332 667 - 980 1670 2004 2676 3012 3348 4020 5029 6709 13688 20648

- - - - - - - - 11432 13721 - 22877 43851 67850

Total Usable Storage Available: PS4100/PS6100

Disk

Drive

Qty /

Size

146

200

(e)

300

400

(e)

500 600 900 1000 2000 3000

- - - - 953 1143 - 1913 3903 5904

698 988 1429 1979 2385 2869 4310 4782 9774 14777

1539 2177 3155 4365 5266 6322 9488 10544 21473 32446

(a) Solid State Disk

(b) Legacy PS50E

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

(e) PS6100S (SSD) only

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