I have an ASA 5505 that is currently running 8.0(4)43 and we have a requirement to upgrade to 8.4(4)1. My only questions is that it currently only has 256 mb RAM. According to the Compatibility guide it states that 512 mb RAM is recommended with the following caveat: "For the ASA 5505, only the Unlimited Hosts license and the Security Plus license with failover enabled require 512 MB; other licenses can use 256 MB."
Am I going to run into any issues with only having 256 mb RAM? See Attached image of current licenses.
you can not do failover and if you have DMZ network planned, it wil not be able to communicate to your inside network.
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