11/13/2014 Hypers & Data Device Sizes - MyTechNotesProject

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Hypers & Data Device Sizes

Example Calculations for different disk and raid types

EFD 200G RAID 5 (3+1) with 32 disks

A single 200GB EFD divided by 8 gives you a 25GB hyper size

(8 hypers per disk is sweet spot for performance for 8 core

directors).

Taking the hyper size of 25G and multiplying by the RAID

data disk count of 3 (there are 3 data drives in a R5 3+1) gives

you 75GB Data Device size.

Taking the disc count for the EFD pool divided by the disk

count of the RAID config (3+1 is 4 in this case) multiplied by

hypers gives you the number of data devices required to

maximize utilization of the pool. For a pool with 32 EFD

drives (sweet spot for 4 engine config with 8 cores per

director) it would be 32/4 * 8 = 64 data devices.

FC 600G RAID 5 (3+1) with 128 disks

75G Hypers when using 8 hypers per disk

225G Data Device size using same formula as above

In 128 Drive Pool the formula, same as above, is: 128/4*8 =

256 data devices

SATA 2TB RAID-6 (6+2) with 64 disks

Since max hyper size is 240G and the goal is capacity and

protection we need to adjust hyper by dividing 240 by the

data disk count of 6 for a RAID 6 (6+2) = 40G hyper

40G*6 = 240G data device size

2000G disk divided by 40G gives us capacity of 50 hypers per

disk

64/8*50 = 400 data device count

SATA 2TB RAID-1 with 192 disks

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Since RAID-1 goal is performance go ahead and use 240G

hypers at 8 hypers per disk and forfeit a small amount of

capacity (80G)

240*1 = 240G data device size

192/2*8 = 768 data device count

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