DCDguy
Contributor
Contributor

vSAN resync throttling v7u1

Hi,

When adding a new host in the cluster the overall latency in the cluster spikes which causes the VM performance to tank. Previously you could set a throttle limit but that is now gone. 

How do you limit the resync so it does not impact the the VMs too much.

Regards

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TheBobkin
VMware Employee
VMware Employee

@DCDguy, adaptive resync *should* automatically throttle the resync to avoid too much, however, this is going to do this based on disk metrics where it is possible that the network to/from the node in question is being saturated.


If this is the case then you could just set the resync throttle on just the newly added node to lower the bandwidth used for resync traffic and smooth the IO (e.g. 128Mbps below):
# esxcli vsan resync throttle set --level=128

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