topic Maximum 6GB & 12GB SAS Stack Size for Fabric Metrocluster in ONTAP Discussions

Maximum 6GB & 12GB SAS Stack Size for Fabric Metrocluster

JKW4 — Wed, 04 Jun 2025 09:42:42 GMT

Can someone please tell me what the maximum stack sizes are for a Fabric MetroCluster using ATTO 7500N Fiber Bridges?

Can you point me to a specific reference?

I see that there are only 4 SAS ports per ATTO device, but what is the maximum stack depth?

Thank You, Happy Holidays,

Joe

Re: Maximum 6GB & 12GB SAS Stack Size for Fabric Metrocluster

CHRISMAKI — Wed, 20 Dec 2023 18:12:18 GMT

Slide 59 of the MetroCluster for ONTAP 9.12.1 Technical Presentation indicates:

Supports multiple storage stacks
Supports up to 240 drives
Can mix SSD and HDD disks

so however you get there is up to you. You will be constrained by the maximum stack size on the controller however, if you were try to deploy 20xDS212c's, that won't work. There is also the following constraints: minimum 2 ATTO switches per stack, DR groups cannot share ATTO switches.