SharePoint 2019 / 2016 capacity guide

You can take a look at https://learn.microsoft.com/en-us/sharepoint/administration/storage-and-sql-server-capacity-planning-and-configuration and https://learn.microsoft.com/en-us/sharepoint/administration/capacity-management-and-sizing-for-sharepoint-server-2013 (still valid for 2016/2019).

SharePoint sizing is largely a dark art -- it depends on how your users are using the farm, content set size, max concurrent users, etc. Many consultants will go with a known good baseline (i.e. 3x DC+FE, 3x App+Search) and right-size from there.

Hi

thx for link but i am looking for any recommendation of servers based on no. of users. earlier i came a cross pdf document which has details like if u have 1000 users than 1 server if recommends and so on.

pls share any document link which guide the number of servers based on number of users.
thx

there is no strict rules how many servers should be used in farm based on number of users. Because overall number of users doesn't tell much - more important how many (in average) users will use it in parallel (how many parallel requests per second) there will be. In general farm with 1WFE + 1App server + 1Db server + 2DCs may serve online service with about 100K active users. If there are many users who is working in parallel - you may add more WFEs with load balancing. Also you may consider adding 2nd DB server as failover cluster.