I need to enable blob cache on my farm, to use image renditions, do I need to enable this on all servers? do I need to do this manual if I have 10 servers? Do I need to do this on application servers?
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You need to enable it on any server running the Foundation Web Application service. The path must be available on all servers with this service.
I built a F/OSS solution to help with this -- https://blobcache.codeplex.com.