Hi @Subramaniyam, Umesh (Cognizant)
The BLOB cache is enabled on a front-end web server and improves performance by retrieving BLOB files from the database and storing them in a directory on the front-end web end server where they are served to users.
Commonly, blob cache works on WFE server. Could you provide relevant screenshots about the blob cache occupying 90GB of APP server?
For more information, you could refer to:
https://learn.microsoft.com/en-us/sharepoint/administration/caching-and-performance-planning
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