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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] RE: [Xen-users] RHEL 5.2 Xen Kernel doesn't detect all amount of physical memory
It seems unlikely that this is related, but see this bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=250299 I had this problem in F7, F8 (apparently it still exists in F9 as well), CentOS 5.2, and maybe CentOS 5.3 (probably exists there, but I don't remember if I've tried it). In each case where I experienced the issue, the patch for grub solved the problem. This issue only seems to happen on certain BIOSes, and even then the stock kernels work fine, but the Xen ones don't. The reason I doubt it is related is I haven't tried it on PAE, only x86_64, and I believe the memory was limited to 3.2 GiB, not 14 like your issue. However, I figured I'd mention this in case you have the same problem (probably 3.2 GiB vs 14) when you go to x86_64 and find the patch solves it (or in case you feel bold and daring and try it even where it seems unrelated and find it to work). Mentioning it to the support guy might get it fixed upstream (since bugzilla reports for F7, F8, and F9 haven't to the best of my knowledge), though it seems like bugzilla should do that if it were going to be fixed upstream at all. Dustin -----Original Message----- From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Ido Levy Sent: Thursday, August 28, 2008 07:58 To: Robert Dunkley Cc: tom.ashley@xxxxxxxxx; Xen-users@xxxxxxxxxxxxxxxxxxx; xen-users-bounces@xxxxxxxxxxxxxxxxxxx Subject: RE: [Xen-users] RHEL 5.2 Xen Kernel doesn't detect all amount of physical memory Hi, Thank you all for your replies. The reason I brought up this issue is that currently I have a machine with 64GB RAM installed with RHEL 5.2 i386 version. When using the PAE kernel the OS detects the total amount of memory, but when using the Xen kernel that shipped with this Red Hat distribution it detects only 14GB of RAM I was wondering if I will install the x86_64 version of RHEL 5.2 will it detects more memory. Any help figure out what is the issue will be appreciated. In addition I would be happy to provide the info to the guy from the Red Hat support team. Thanks Ido "Robert Dunkley" <Robert@xxxxxxxxx > To Sent by: <tom.ashley@xxxxxxxxx> xen-users-bounces cc @lists.xensource. Xen-users@xxxxxxxxxxxxxxxxxxx com Subject RE: [Xen-users] RHEL 5.2 Xen Kernel doesn't detect all 08/28/2008 02:24 amountofphysical memory PM Hi, I got a reply from RedHat support (Only emailed poster and not the list initially). Max for RHEL Xen kernel is same as standard Kernel (1Tb for X64) but max mem per VM is limited to 32Gb. Reassuring to hear though, I was a bit worried that updating our Centos 5.2 systems from 32Gb Ram to 128Gb might not work :) Rob -----Original Message----- From: tom.ashley@xxxxxxxxx [?mailto:tom.ashley@xxxxxxxxx] Sent: 28 August 2008 12:15 To: Robert Dunkley; xen-users-bounces@xxxxxxxxxxxxxxxxxxx; Ido Levy Cc: Xen-users@xxxxxxxxxxxxxxxxxxx Subject: Re: [Xen-users] RHEL 5.2 Xen Kernel doesn't detect all amountofphysical memory Bog standard out of the box, I have a 64 bit centos 5.2 holding and recognising 64GB RAM happily. RHEL should be able to do the same. Sent using BlackBerry(r) from Orange -----Original Message----- From: "Robert Dunkley" <Robert@xxxxxxxxx> Date: Thu, 28 Aug 2008 10:07:33 To: Ido Levy<IDOL@xxxxxxxxxx> Cc: <Xen-users@xxxxxxxxxxxxxxxxxxx> Subject: RE: [Xen-users] RHEL 5.2 Xen Kernel doesn't detect all amount ofphysical memory >From what I have read the XenServer distribution can support up to 32GB RAM per VM and 128GB for the whole system. My guess is that unless a deliberate restriction is put in place the limits RAM for RHEL5 Xen kernel then 256Gb RAM in total and 32Gb RAM per VM is probably the max. Anyone know for sure? -----Original Message----- From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx [?mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Ido Levy Sent: 28 August 2008 09:54 To: xen-users@xxxxxxxxxxxxxxxxxxx Subject: [Xen-users] RHEL 5.2 Xen Kernel doesn't detect all amount ofphysical memory Hello All, Does anyone know what is the current status of RHEL 5.2 x86_64 with respect to the maximum amount of RAM detected by the Xen 64 bit kernel (the one that shipped with Red Hat distribution ) In the following link https://www.redhat.com/docs/manuals/enterprise/RHEL-5-manual/en-US/RHEL5 10/Virtualization_Guide/ch-virt-hw-support.html it states that 32GB of RAM is the maximum amount of physical memory the Xen kernel can detect. Is it still the updated status ? Is there a work around or any other way to overcome this limit ? Any info would be appreciated Thanks, Ido _______________________________________________ Xen-users mailing list Xen-users@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-users The SAQ Group Registered Office: 18 Chapel Street, Petersfield, Hampshire. GU32 3DZ SEMTEC Limited trading as SAQ is Registered in England & Wales Company Number: 06481952 http://www.saqnet.co.uk AS29219 SAQ Group Delivers high quality, honestly priced communication and I.T. services to UK Business. DSL : Domains : Email : Hosting : CoLo : Servers : Racks : Transit : Backups : Managed Networks : Remote Support. 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