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Hi, Raghavendra,

Just sharing my experience, I started working on A/A support for NetApp NFS driver, and I followed the same steps you summarized.
Besides that, I think the effort is to understand/test if any of the driver features might break in the A/A environment.

If anyone knows about anything else we should test, I would be happy to know too.

Regards,
Nahim Souza.


From: U T, Raghavendra <raghavendra-uddhav.tilay at hpe.com>
Sent: Monday, May 8, 2023 09:18
To: openstack-discuss at lists.openstack.org
Subject: [cinder][dev] Add support in driver - Active/Active High Availability

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Hi,

We wish to add Active/Active High Availability to:
1] HPE 3par driver - cinder/cinder/volume/drivers/hpe/hpe_3par_common.py
2] Nimble driver - cinder/cinder/volume/drivers/hpe/nimble.py

Checked documentation at
https://docs.openstack.org/cinder/latest/contributor/high_availability.html
https://docs.openstack.org/cinder/latest/contributor/high_availability.html#cinder-volume
https://docs.openstack.org/cinder/latest/contributor/high_availability.html#enabling-active-active-on-drivers

Summary of steps:
1] In driver code, set SUPPORTS_ACTIVE_ACTIVE = True
2] Split the method failover_host() into two methods: failover() and failover_completed()
3] In cinder.conf, specify cluster name in [DEFAULT] section
cluster = <cluster_name>
4] Configure atleast two nodes in HA and perform testing

Is this sufficient or anything else required ?

Note: For Nimble driver, replication feature is not yet added.
So can the above step 2 be skipped?

Appreciate any suggestions / pointers.

Regards,
Raghavendra Tilay.



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