From: "sylvan.dcunha@gmail.com" sylvan.dcunha@gmail.com
I had a Centos 5.5 OS running for about 6 months used as a Xen VM server prfectly running 3 Virtual machines Its a Sun Blade server with 8 core Xeon Proceesor with 32 GB Ram couple of days back I added another 32 gb ram . The bios shows the added ram that is now it shows me 64 GB but the Centos OS just recognizes 32gb only
No Xen experience but did you do this?
http://wiki.xensource.com/xenwiki/XenFaq#head-f13e54576168210e3e59c16a1f2096...
JD