I'm running a Magento EE 1.12.2 (equally in CE 1.7.2) where we have Redis for caching (*Cm_Cache extension, Redis v 2.2.12*), but we use Memcache for session storage.

Redis is not supported out of the box on these Magento versions. So my concern here is:

- Is it worth the hassle to get session storage into Redis in terms of effort vs. speed improvement?
- Isn't Memcache just as good or maybe even better?

In this project we have large session files as we need to store third-party XML files into the session, so optimizing session read and writes can have a considerable impact.

From `local.xml`:

    <session_save><![CDATA[memcache]]></session_save>

And: 

    <cache>
        <backend>Cm_Cache_Backend_Redis</backend>
        [...]
    </cache>