When I changed the value of “mem.overprovisioning.factor” in a cluster,
i.e. from 1 to 2, the used memory value in dashboard also changed (in this
example, doubled) as well as total momory. After I shut down VMs in the cluster
and start them, memory usage became correct.
I found the code calculating the used momory but couldn’t understand the
way to calculating and updating this value.
In com.cloud.capacity.CapacityManagerImpl.updateCapacityForHost(Host):
===================================================================
usedMemory += ((so.getRamSize() * 1024L *
1024L)/ramOvercommitRatio)*clusterRamOvercommitRatio;
===================================================================
In the code above, clusterRamOvercommitRatio updates instantly after
overprovisioning factor sets, but ramOvercommitRatio only updates according to
clusterRamOvercommitRatio when VM starts. This leads to inconsistency between
the two variables.
So my question is:
1. Why calculating usedMemory in such way (devided by ramOvercommitRatio
and then multiplied clusterRamOvercommitRatio)?
2. Why NOT updating ramOvercommitRatio when overprovisioning factor
changes, until when VM starts?
3. How to fix incorrect memory usage without restarting VMs ?
Thanks.
Kelvin Cai,
Ping An Technology (Shenzhen) Co., Ltd. | Infrastructure.
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