<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML xmlns="http://www.w3.org/TR/REC-html40" xmlns:o = "urn:schemas-microsoft-com:office:office" xmlns:w = "urn:schemas-microsoft-com:office:word" xmlns:st1 = "urn:schemas-microsoft-com:office:smarttags"><HEAD><TITLE>Message</TITLE> <META http-equiv=Content-Type content="text/html; charset=us-ascii"> <META content="MSHTML 6.00.2900.2668" name=GENERATOR><o:SmartTagType namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="stockticker"></o:SmartTagType> <STYLE>@font-face { font-family: Tahoma; } @page Section1 {size: 8.5in 11.0in; margin: 1.0in 1.25in 1.0in 1.25in; } P.MsoNormal { FONT-SIZE: 12pt; MARGIN: 0in 0in 0pt; FONT-FAMILY: "Times New Roman" } LI.MsoNormal { FONT-SIZE: 12pt; MARGIN: 0in 0in 0pt; FONT-FAMILY: "Times New Roman" } DIV.MsoNormal { FONT-SIZE: 12pt; MARGIN: 0in 0in 0pt; FONT-FAMILY: "Times New Roman" } A:link { COLOR: blue; TEXT-DECORATION: underline } SPAN.MsoHyperlink { COLOR: blue; TEXT-DECORATION: underline } A:visited { COLOR: purple; TEXT-DECORATION: underline } SPAN.MsoHyperlinkFollowed { COLOR: purple; TEXT-DECORATION: underline } SPAN.EmailStyle17 { COLOR: windowtext; FONT-FAMILY: Arial; mso-style-type: personal-compose } DIV.Section1 { page: Section1 } </STYLE> </HEAD> <BODY lang=EN-US vLink=purple link=blue> <DIV>PAE is a hardware/software trick that allows a 32bit system to address 36-bits of memory (If I recall correctly). In any case, it technically allows up to 64 Gigs of ram. However, it's not linear and is broken into 3.2 (ish) gigabyte pages of memory that can be addressed by a PAE enabled kernel. Your hardware also has to support PAE (which I would think your box does? What is your hardware?)</DIV> <DIV> </DIV> <DIV>The ELsmp kernel in RHEL3 is PAE enabled, but I think it only supports up to 16 GB of ram (maybe it's 32).</DIV> <DIV>You'll need to install the ELhugemem kernel to go higher.</DIV> <DIV> </DIV> <DIV>Are you sure you are running ELsmp? What does 'cat /proc/meminfo' show?</DIV> <BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px"> <DIV></DIV> <DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left>-----Original Message----- From: Mei.Zhang@alltel.com [mailto:Mei.Zhang@alltel.com] Sent: Thursday, July 21, 2005 3:06 PM To: rhn-users@redhat.com Subject: RE: [rhn-users] Unable to boot with more than 4GB of RAM </DIV> <DIV>You may need 64bit rhel</DIV> what is PAE enabled kernel? <BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px"> <DIV class=OutlookMessageHeader dir=ltr align=left>-----Original Message----- From: rhn-users-bounces@redhat.com [mailto:rhn-users-bounces@redhat.com]On Behalf Of Serge Bianda Sent: Thursday, July 21, 2005 3:01 PM To: rhn-users@redhat.com Subject: [rhn-users] Unable to boot with more than 4GB of RAM </DIV> <DIV class=Section1> Hello,<o:p></o:p> <o:p> </o:p> I had three machines that we migrated from SuSE 9 to RHEL 3 ES, and Under SuSE the amount of memory was showing correctly as 6GB, but under RHEL when I do a dmesg I get the following report:<o:p></o:p> Warning only 4GB will be used.<o:p></o:p> Use a <st1:stockticker w:st="on">PAE</st1:stockticker> enabled kernel.<o:p></o:p> <o:p> </o:p> Any Ideay on how to resolve that and have RHEL ustilize the maximum memory? I have the following kernel loaded: 2.4.21-27.ELsmp<o:p></o:p> <o:p> </o:p> Thanks<o:p></o:p> <o:p> </o:p> Serge<o:p></o:p> <o:p> </o:p></DIV></BLOCKQUOTE><PRE>****************************************************************************************** The information contained in this message, including attachments, may contain privileged or confidential information that is intended to be delivered only to the person identified above. If you are not the intended recipient, or the person responsible for delivering this message to the intended recipient, ALLTEL requests that you immediately notify the sender and asks that you do not read the message or its attachments, and that you delete them without copying or sending them to anyone else. </PRE></BLOCKQUOTE></BODY></HTML>