On 08/26/2011 12:51 PM, benedict dcunha wrote: > Thanks Leonard, > Thanks for the immedite reply . apprecite. > actually many post s say the PAE kernel required for addressing more than 4 > gb ram . but since my server already detects 32 gb ram , detecting 64 also > should not be an issue.. "many posts say" a lot of things. Either these posts are specifically talking about 32bit systems or they are wrong. With a 32bit integer you can only address 4gb of ram so a hack was devised to make it possible go beyond that limit called PAE. Since with 64bit you no longer have that problem PAE doesn't exist on a 64bit system. http://en.wikipedia.org/wiki/Physical_Address_Extension > but just wondering why??. No idea but it has nothing to do with PAE. Can you post the output of "xm info"? Regards, Dennis