topic Re: multiple raid group in an aggregate in ONTAP Discussions

multiple raid group in an aggregate

RATNATHURAI — Thu, 05 Jun 2025 05:58:58 GMT

Hope smeone can give me an answer.

We have a filer with 14 disks and one aggregate aggr0, the raidsize =20

so this aggregate has only one rg for now with 14 disks.

I want to add more disk to that aggregate but do not have same size , this case, I am thinking of creating new raid group. by doing this (I never did this)

> aggr add aggr0 -g new -d <disk1> <disk2> , etc (total 7 disks)

1. Will this put the all 7disks in the new raid group or add the disks in th existing raid group ?

2. If that create new raid group for he 7 disks, Can I increase that raid group later when I have more disks, that is, from RG7 to RG=20?

Re: multiple raid group in an aggregate

aborzenkov — Tue, 09 Jul 2013 11:26:27 GMT

Yes to both (assuming your Data ONTAP version supports “-g new” option).

Re: multiple raid group in an aggregate

RATNATHURAI — Tue, 09 Jul 2013 13:06:49 GMT

How do I increase the disk count on that raid groups ?

RAID group /a_aggr0/plex0/rg0

RAID group /a_aggr0/plex0/rg1

rg0 has 14 disks

rg1 has 7 disks

I will appreciate if you can post me the comand ?

Re: multiple raid group in an aggregate

pedro_rocha — Tue, 09 Jul 2013 15:01:36 GMT

Hello,

If I understand well, you have an aggr with 14 disks and one RG. You want to add 7 disks, but you want to create a new RG.

If you want that, you should reduce the RG size on this AGG to 14 and add those 7 disks. This will create a new RG with 7 disks.

But using that AGGR with that unbalanced RG size configs is not recommended. If this are SAS or FC disks I would go with RG size=21.

Regards,

Pedro Rocha.

Re: multiple raid group in an aggregate

RATNATHURAI — Tue, 09 Jul 2013 18:05:39 GMT

Can I change this RG late, that is, adding more disks to thiss RG later will the RG same as the other RG

Re: multiple raid group in an aggregate

pedro_rocha — Tue, 09 Jul 2013 20:41:54 GMT

Hi,

If you have the following combination now?

RG1 = 14 disks

RG2 = 7 disks

You can add more 7 disks to this aggr in the future and it will be 14 + 14.

Regards,

Pedro Rocha.