Hey,
I have a user case that we have 2 physical hosts, each host will have 2
VMs.
say VM1 and VM2 are in Host A, while VM3 and VM4 are in host B
VM1 and VM3 are pair acting as Active-Standby;
VM2 and VM4 are pair acting as Active-Standby
Now VM2 and VM4 both have 150G DRDB volume to by sync.
Based on testing, we found that:
if purely using RCP to copy big file, say 5G, from VM2 to VM4, the speed is
roughly 30G ~ 50G
However DRDB sync speed is 10~20G
2 Hosts are connected via 1G network.
My questions are:
1. why have such big gap between rsync and DRDB sync?
2. How to improve the sync speed between 2 DRDB volumes?
Many thanks!
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