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Knowledge Base

Memory hot-add fails if the assigned virtual machine memory equals the size of its memory reservation (1020430)

Last Updated: 7/15/2011Categories: Total Views: 12430Language:
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Symptoms

Memory hot-add fails

You see the following error message within vSphere Client:

Hot-add of memory failed. Failed to resume destination VM: Bad parameter. Hotplug operation failed

The ESX host's /var/log/vmkernel log file contains entries similar to:

WARNING: FSR: 2804: 1270734344 D: Received invalid swap bitmap lengths: source 0, destination 32768! Failing migration.
WARNING: FSR: 3425: 1270734344 D: Failed to transfer swap state from source VM: Bad parameter
WARNING: FSR: 4006: 1270734344 D: Failed to transfer the swap file from source VM to destination VM.
WARNING: Migrate: 295: 1270734344 D: Failed: Bad parameter (0xbad0007) @0x41800847ae89
WARNING: Migrate: 295: 1270734344 S: Failed: Bad parameter (0xbad0007) @0x4180084784ba

memory-hot-add-fails

Resolution

This issue is resolved in vSphere 4.0 Update 3.

This issue occurs if the Fast Suspend Resume (FSR) fails during the hot-add because the source does not have a swap file but the destination does.

Since the virtual machine at the source of the FSR has all of its memory reserved, no swap file is needed. The hot-add then adds memory to the virtual machine that is not backed by a reservation (since it does not increase by itself) at its destination and therefore needs a swap file in case of virtual machine memory swapping.

This issue only applies to the FSR on memory hot-add. vMotion and Storage vMotion are not affected.

To workaround this issue, reduce the memory reservation of the virtual machine.

To reduce the memory reservation of the virtual machine:

Right-click the virtual machine and choose Edit Settings.

Click the Resources tab.

Click Memory under Settings.

Reduce the memory reservation of the virtual machine by one MB.

Detectable by VMware SkylineTM

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Attachments

Additional Resources

KB
•
End Of General Availability of the Free vSphere Hypervisor (ESXi 7.x and 8.x) (2107518)

KB
•
Download and Install VMware Fusion (2014097)

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