On the forum there are a number of people who are complaining about high
load averages on the host and/or in the VM being backed up when using
the new KVM Live Backup feature.
My suspicion is that having the KVM process move the backup data around
the performance of the VM is negatively affected. With the KVM process
using more CPU, performing more IO the VM is starved for resources
possibly caused by the CPU cache being filled with backup data instead
of VMs executing code.
I would like to perform some benchmarks where CPU/IO/RAM intensive tasks
are run inside the VM while performing a LVM Snapshot backup and then a
KVM Live Backup. Comparing the completion times of the CPU/IO/RAM tasks
would allow us to assess what subsystems are affected, good or bad, by
KVM Live Backup.
Since all of the LVM Snapshot code was removed I am unable to perform
the above benchmarks, anyone have a suggestion how we could perform such
tests easily?
Eric
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