topic Re: Getting the most out of my disks in ONTAP Hardware

Getting the most out of my disks

joesmith — Wed, 04 Jun 2025 10:58:29 GMT

Hello,

I am somewhat new to the storage game and working for a new company that recently bought a FAS2750 and 1 additional disk shelf.

I am trying to get our system set up in the best way and can't seem to get use out a large chunk of our disks.

The FAS2750 has 24 1.64TB disks.

the Disk shelf has 12 7.15TB disks.

When I look at my disk summary, it says that i have 85.67TB of spare disk space.

As far i understand I would need to place the disk shelf disks into a different aggregate because the are different sized disks from the ones in the controller unit. I can't seem to figure out how to get the existing aggregates to let go of these disks so that I can add them to their own aggregate. Is that even the best thing to do with the spare disks?

Please let me know if I should elaborate on anything.

Thanks,

Joe

Re: Getting the most out of my disks

SpindleNinja — Mon, 03 Aug 2020 21:02:43 GMT

With that config, I typically do all the "internal" (1.64T drives) aggr for controller 01. And the 1.8 drives as an aggr (+1 spare) on controller 02. It's not a 50/50 match, but it's probably the simplest way to do it.

There's other options though. You can mix drives inside an aggr. So you can have 1 raid group of 1.67 drives and one of 1.8. but that would make it all on one controller.

Re: Getting the most out of my disks

paul_stejskal — Tue, 04 Aug 2020 14:31:56 GMT

He said 7 TB drives.

You'll have to use two of those at a minimum with RAID DP for parity, or three with RAID TEC.

Re: Getting the most out of my disks

SpindleNinja — Tue, 04 Aug 2020 14:54:16 GMT

i swear that said 1.8 sorry about that OP.

Re: Getting the most out of my disks

joesmith — Tue, 04 Aug 2020 17:26:00 GMT

Thank you for you input guys.

I understand that I am going to have lose the space on two or three of the disks for DP but how do i remove these 7TB disks from the aggrs that they are in right now to create a new aggregate?

Or am I able to just keep them in the aggregate they are in but use them for Data instead of spares? <--- This would be "No" right? because you can't mix disk size in the aggregates?

Thanks,

Joe

Re: Getting the most out of my disks

SpindleNinja — Tue, 04 Aug 2020 17:53:52 GMT

you can't remove disks from an aggr. You'll need to delete the aggr.

How many aggrs do you have?

Can you post the out of the following?

row 0

aggr show

storage disk show -partition-ownership

Re: Getting the most out of my disks

joesmith — Tue, 04 Aug 2020 20:05:15 GMT

Hello,

Here are the results of the commands you asked about. the last one is pretty long!

BR90::> row 0

(rows)

BR90::> aggr show

Aggregate Size Available Used% State #Vols Nodes RAID Status

--------- -------- --------- ----- ------- ------ ---------------- ------------

aggr0_BR90_01_root 159.9GB 7.73GB 95% online 1 BR90-01 raid_dp,

normal

aggr0_BR90_02_root 159.9GB 7.75GB 95% online 1 BR90-02 raid_dp,

normal

aggr1_BR90_01 13.05TB 12.95TB 1% online 1 BR90-01 raid_dp,

normal

aggr1_BR90_02 13.05TB 13.04TB 0% online 3 BR90-02 raid_dp,

normal

4 entries were displayed.

BR90::> storage disk show -partition-ownership

Disk Partition Home Owner Home ID Owner ID

-------- --------- ----------------- ----------------- ----------- -----------

Info: This cluster has partitioned disks. To get a complete list of spare disk capacity use

"storage aggregate show-spare-disks".

1.0.0 Container BR90-02 BR90-02 538113064 538113064