Hi
Martunis Mukhtar •,
Welcome to Microsoft Q&A forum and thanks for using Azure Services.
As I understand, you want to know if upgrading Azure Cache for Redis from V4 to V6 will impact to website.
See below FAQ which might help:
Is my application affected during upgrade?
Your application sees a connection blip that lasts a few seconds. Your application should retry commands appropriately when experiencing connectivity errors. Fore more information, see Best practices for connection resilience.
Typically, the upgrade operation takes about 20 minutes per cache node, but it could take longer if the cache is under high server load.
Note:
Standard and Premium caches are fully functional and available during the upgrade process, but your applications see a connection blip for a few seconds. Basic caches are unavailable during the upgrade and all data will be lost.
During the upgrade process, the replica node of your cache is first upgraded to run Redis version 6. The upgrade replica node then takes over as the primary node for your cache while the former primary node reboots to take on the role of replica. This process is exactly like the patching process described in How does patching occur?.
Redis version 6 is compatible with version 4 and applications should continue to function seamlessly after the version upgrade.
If you don't upgrade your Redis 4 cache by June 30, 2023, the cache is automatically upgraded to version 6. If you have a maintenance window scheduled for your cache, the upgrade happens during the maintenance window. Geo-replicated Redis 4 caches will be retired on August 30, 2023.
Also, Caches can't be upgraded while they have a geo-replication link.
- First, you must unlink the caches temporarily.
- Upgrade both your caches.
- Then relink them.
Hope this information helps. Do let us know if you have further queries. Thank you.