Is there any rule of thumb on the number of caching services to have with Content delivery servers. Like 2 Cache services with 1 CD in Azure PAAS.
Asking this question, because one of our clients faces 100% CPU usage on Caching service and Content delivery services, for at least 15-20 minutes after the Sitecore Azure PAAS build completes successfully and web role is started. This issue we are facing after the Client added 2 more Content delivery servers (in anticipation of more site visits) during the festival week in China.
So do we have to increase the Caching service count from current 2 to 4? The only issue is high CPU usage after the build and sites are unavailable for at least 25 minutes after.
Currently, we have 4 CD's but only 2 cache services. I understand that the number of Caching services may be dependent on the No of Site hits and other factors as well. Does Azure support team help clients in issues like these to verify Site installations?