Environment
- Red Hat Enterprise Linux 7.0
- kernel-3.10.0-123.6.3.el7.x86_64
Issue
- How to hot plug memory in RHEL7 on the VMware guests?
- How to check the memory state on RHEL7 in the VMware guests?
Resolution
Note: The hardware or virtualization provider must support hot plug functionality. Historically VMware has supported hot-add memory, but not hot-remove memory. Verify functionality with your hardware or virtualization provider before proceding.
We can check current memory status :
- If the memory section is online, you'll read "online".
If the memory section is offline, you'll read "offline".
#cat /sys/devices/system/memory/memory*/state
Hot-add memory to the system :
#echo online > /sys/devices/system/memory/memory<num>/state
Hot-remove memory from the system :
We can remove the memory which the /sys/devices/system/memory/memory/removable is 1.
#echo offline > /sys/devices/system/memory/memory<num>/state
For more details about memory hotplug, please check kernel-doc-/Documentation/memory-hotplug.txt.
- Product(s)
- Red Hat Enterprise Linux