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Forum Discussion

Rise_77519's avatar
Rise_77519
Icon for Nimbostratus rankNimbostratus
Jun 04, 2014

ram cache problem1

Hi, I configured a web acceleration profile with the 600 seconds max age value. when i look at the response from the server ( bigip vs) i see that the cache control max-age value 604800 and also see ...
Patrik_Jonsson's avatar
Patrik_Jonsson
Icon for MVP rankMVP
Jun 05, 2014

Hi!

Had a discussion with F5 regarding this a few months ago. According to the technician I talked to the LTM performs OR logic to determine if cached entree is subject to revalidation evaluating "maximum age" and cache-control header in server's response. In another words if "maximum age==180" but cache-control: max-age==60", LTM will revalidate the content after 60 seconds.

The cache-control: max-age might not be rewritten by the ltm because it keeps it's own records. You can check the entries by issuing the following command:

show ltm profile ramcache

You should be able to verify this in the IIS log by checking how often the cached documents are fetched by the load balancer.

/Patrik