cluster APIC + ACI Multi-POD

[Romandm]

Good day !
Tell me please
I can not find information on the cluster APIC.
example:
have Cisco ACI Multi-POD, 2 pod: DC-1 and DC-2
APIC cluster: 9 nodes (APIC)
on DC-1 installed 5 nodes
on DC-2 installed 4 nodes
communication between POD is broken
what will happen?
as a cluster of 9 nodes, In 5 nodes on DC-1, will be in read-write mode, and on DC-2 will be in read mode?
or on DC-1 controllers will also be able to make changes on their POD?
And after the restoration of the cluster, is the configuration synchronized?
I will be grateful for the links to the educational material where such a scenario is indicated

[Romandm]

I wonder what they write here that a cluster of 2 nodes will work

"As long as there are at least two APICs in the cluster online, there is read/write access."

https://www.cisco.com/c/en/us/td/docs/switches/datacenter/aci/apic/sw/1-x/troubleshooting/b_APIC_Troubleshooting/b_APIC_Troubleshooting_chapter_0101.html

[Romandm · Accepted solution]

The split fabric site with two APIC controller nodes (site 1 in the figure above) has quorum (two working nodes out of a cluster of three). The APIC in site 1 can execute policy read and write operations to the fabric. An administrator can log in to either APIC controller node in site 1 and make policy changes. After the link between the two sites recovers, the APIC cluster synchronizes configuration changes across the stretched fabric, pushing configuration changes into the concrete model in all the switches throughout the fabric.

https://www.cisco.com/c/en/us/td/docs/switches/datacenter/aci/apic/sw/kb/b_kb-aci-stretched-fabric.html