ONTAP Hardware

FAS3210C (8.1.1) and DS4243 - RAID Group Size and Hot Spares?

dartfordbc
2,257 Views

Hi

We have just connected an additional shelf of 600GB 15kSAS DS4243.

Currently my controller which I'm adding the shelf to has 2 x RG (16 Disks) - RG0 has 16 disk and RG1 has 6 disks. That leaves 2 spare

What is the best option about adding this new shelf? Do I leave the RG at 16 disks? If  I do to give best performance and balance I have to use 26 disks which leaves only 1 spare.

Do I increase the RG size to 23 and use 24 disks so the RG are balanced?

Thanks in advanced!

3 REPLIES 3

radek_kubka
2,257 Views

Hi,

It is a dual-controller system, right?

Are you adding all 24 new disks to one of the controllers only? If you don't tweak anything, then you will end up wit a pretty neat setup IMHO:

- RG0 - 16 disks (no change)

- RG1 - 16 disks (6 old + 10 new)

- RG2 - 14 disks (all new)

- 2 hot-spares

Nothing wrong about this in my view.

Regards,

Radek

dartfordbc
2,257 Views

That's correct, a dual controller system.

Yes I'm adding all 24 new disks to one of the controllers only.

Thanks for your help, I wanted to check it was right as the warning message about not being balanced was a little off putting!.

Thanks again.

radek_kubka
2,257 Views

RAID groups are very unbalanced now (16+6), but should be fine after adding more disks (16+16+14).

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