- Red Hat Enterprise Linux 5
- Red Hat Enterprise Linux 6 + earlier virt-manager-0.8.6-4.el6
- KVM and XEN
- Why virt-manager GUI fails to allocate memory above 32GB for VM based on kvm?
- How much memory can be allocated to KVM guest through virt-manager?
- Virtualization limits page says KVM guest supports up to 512 GB of memory but virt-manager failed to allocate more than 32G memory to fully virtualized KVM guest.
- Add/extend the guest memory manually by editing guest XML config file.
- Stop the Virtual Machine
- Run the following command to edit the XML definitions of VM
- For example (here, <memory> is the "setmaxmem" value and <currentMemory> is the "setmem" value):
virsh # edit <domain-name> <domain type='kvm'> ... <memory>514144</memory> <currentMemory>262144</currentMemory> ... </domain>
- Change the memory value as per your requirement and save the configuration.
- Restart the libvirtd service
- Edit the guest file xml located under /etc/xen/
maxmem = 512 <-- These are the parameters which need to be modified. It is mentioned in MB memory = 512 <-- So for 32 GB mention 32000
Restart the libvirtd service
This issue is fixed in Red Hat Enterprise Linux 6 with virt-manager-0.8.6-4.el6 (Bugzilla 640781)
- Virt-manager has some limitation of maximum memory configuration in GUI.
- It is not possible to allocate more then 32GB memory to VM through virt-manager in RHEL 5.
- Red Hat Enterprise Linux
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