topic Re: Is it possible to create an aggregate? (RAID group with ADP and non-ADP)disks? in ONTAP Discussions

Is it possible to create an aggregate? (RAID group with ADP and non-ADP)disks?

YXMRETK — Wed, 04 Jun 2025 10:02:24 GMT

Hi Everyone

We are currently designing to build the FAS2720 from next month.

When the equipment is delivered, it is an OEM product and is already set up.

The 12 disks of the controller have an ADP configuration, and all but the Root aggregate are in an unbuilt state.
It has a disk configuration of 36 NL-SAS 4TB including controller and shelf.

In this case, is it possible to create an aggregate with a 15D + 2P RAID group using 12 ADP data partitioned disks and 5 unpartitioned disks?

When I checked the website, the 5 discs were partitioned, but it was possible to create them, but is that correct?

The details of the device configuration are described below.

HW: FAS2720
Shelf: DS212C (2shelf)
Disk: NL-SAS 4TB (36disk)

Thanx

Re: Is it possible to create an aggregate? (RAID group with ADP and non-ADP)disks?

YXMRETK — Thu, 07 Apr 2022 10:37:22 GMT

postscript
ONAP: 9.9.1

Re: Is it possible to create an aggregate? (RAID group with ADP and non-ADP)disks?

paul_stejskal — Thu, 07 Apr 2022 12:56:43 GMT

I believe you could create a RG1 of the non-ADP disks on the external shelf.

Re: Is it possible to create an aggregate? (RAID group with ADP and non-ADP)disks?

YXMRETK — Thu, 07 Apr 2022 13:29:05 GMT

Sorry at the lack of explanation.

The configuration this time is based on the following assumptions.

Node 1
Disc: 17 + 1hotspare

Node 2
disk
Disc: 17 + 1hotspare

On both nodes, I need to create an aggregate using 17 disks (15D + 2P).
Therefore, one node needs to have a mixture of ADP and non-ADP disks ...

Re: Is it possible to create an aggregate? (RAID group with ADP and non-ADP)disks?

paul_stejskal — Thu, 07 Apr 2022 13:42:51 GMT

Ah. That makes sense. Honestly I'm not sure if it is possible to create the external shelf as ADP if it is HDDs, and obviously you don't want to reset the system to lose the 6 disks for 2 root aggregates. https://kb.netapp.com/Advice_and_Troubleshooting/Data_Storage_Systems/FAS_Systems/FAS2720_does_not_support_root_aggregate_partition_on_external_shelf

Re: Is it possible to create an aggregate? (RAID group with ADP and non-ADP)disks?

TMACMD — Thu, 07 Apr 2022 14:26:54 GMT

Personally, I’d do this

1. create a data aggregate of 6 on each controller using raid dp with the ADP drives.

2. set the Max raid size to 16

3. add 10 drives to each aggregate

the system will auto partition

you will not lose too much to parity as it is already accounted for

you end up with a single raid group on each node of 14+2, 2 spare disks

Re: Is it possible to create an aggregate? (RAID group with ADP and non-ADP)disks?

YXMRETK — Thu, 07 Apr 2022 14:21:50 GMT

I couldn't see the link with my authority.

Would you please tell me what you wrote if possible?

Re: Is it possible to create an aggregate? (RAID group with ADP and non-ADP)disks?

YXMRETK — Thu, 07 Apr 2022 14:25:33 GMT

Thank you for your answer.

Please tell me the content of your answer.

Why not create aggregates on 16 discs at once?

What is the reason for creating an aggregate with 6 disks first?

Re: Is it possible to create an aggregate? (RAID group with ADP and non-ADP)disks?

paul_stejskal — Thu, 07 Apr 2022 14:32:51 GMT

I think ONTAP will allow to do what you want is what Thomas is saying. Create the two data aggregates then when you try to add the disks ONTAP will be like "oops sorry, you need a new RG".

Re: Is it possible to create an aggregate? (RAID group with ADP and non-ADP)disks?

TMACMD — Thu, 07 Apr 2022 14:39:22 GMT

Habit. I want to make sure that ontap will in fact use the adp drives first to make the start of the aggregate. I know that if I add disks to an aggregate with adp ontap will auto partition as long as I am under the max raid size.

i think you may be able to just do all 16 at once. Just make sure that you don’t inadvertently end up with two raid groups

on new systems (that don’t have a cluster born date before ontap 9.4) the system will use a fast zero to add drives. Really fast and slick

(if the cluster was born on 9.3 or earlier, disks will always slow-zero)

Re: Is it possible to create an aggregate? (RAID group with ADP and non-ADP)disks?

YXMRETK — Thu, 07 Apr 2022 15:07:46 GMT

habit! I think it's a good habit. I want to apprentice.

Thank you for your polite answer!

I was relieved to know that I could do what I wanted to do.

I'm not good at English, so I used a translation tool to ask questions, so I think there were some parts that were difficult to understand ...