topic Re: DS2246, DS224C and spares in ONTAP Discussions

DS2246, DS224C and spares

bsnyder27 — Wed, 04 Jun 2025 15:18:20 GMT

We recently purchased a number of DS224C shelves that are now mixed in with older DS2246 shelves. Both have 900GB drives populated in them but they're on two different stacks.

We've created seperate aggregates to keep the disks behind the IOM6 and IOM12 apart. Seems it's not a problem to have the disks mixed, but is this recommended? What happens when a drive fails? Is there a way to set some affinity to the correct drive based on the shelf it's a member of?

Configuration:

2 nodes

2 spares from each stack of shelves for each node (8 total)

7 DS224C shelves (IOM12)

5 DS2246 shelves (IOM6)

Re: DS2246, DS224C and spares

GidonMarcus — Wed, 22 Mar 2017 13:22:25 GMT

Hi

in Ontap 8.2.3 7 mode

options disk.auto_assign on

options disk.auto_assign_shelf on

in Cdot

storage disk option modify ‑autoassign on ‑autoassign-shelf on -node *

or in cdot 8.3 and higher

storage disk option modify ‑autoassign on ‑autoassign-policy shelf -node *

or - much better still in 8.3 and higher;

storage disk option modify ‑autoassign on ‑autoassign-policy stack -node *

Gidi

Re: DS2246, DS224C and spares

bsnyder27 — Wed, 22 Mar 2017 12:12:59 GMT

Gidi,

Thank you. This is exactly what I was looking for. Seems the default setting on our system, a FAS8200, would be stack. Guess it did indeed already have the intelligence built in to assign the appropriate disk.

Thanks for the quick reply.

Re: DS2246, DS224C and spares

aborzenkov — Wed, 22 Mar 2017 12:54:45 GMT

Disk ownership rules are not relevant for spare selection (if I understood your question correctly) unless all 6G shelves are owned by one node and all 12G shelves are owned by another node.

Re: DS2246, DS224C and spares

GidonMarcus — Wed, 22 Mar 2017 13:21:10 GMT

Sorry,

@aborzenkovis right. i was not thinking on the whole process.

the assignment for replacement in the raid group is controlled by:

storage raid-options show

(

raid.mix.hdd.disktype.capacity
raid.mix.hdd.disktype.performance
raid.mix.hdd.rpm.capacity
raid.mix.hdd.rpm.performance

)

Gidi