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Subject2.4 and cryptofs on raid1 - what will be cached and how many times

Could you please answer the following question:

Suppose we have a crypto filesystem on a raid1 array of 2 devices. What will
the kernel cache of fileystem data contain - encrypted data or not? Will is
be 2 copies of the same data in the cache or not?

Is there any way to force kernel to cache the same file data only once, and
keep it unencrypted (in cache)?

Thanks in advance.
Best regards,
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