Hi, I have a strange phenomenon that I cannot readily explain so I wonder if anyone here can shed a light on this.
The host system is a Dell r815 with 64 cores and 256G ram and has centos 6 installed. The five guests are also running centos 6 and are running as a hadoop cluster. The problem is that I see disk-io spikes in the vm's which then cause soft lockups in the guest but I also see hanging processes on the host as if the entire machine locks up for 30-60 seconds.
Now I know that having all cluster members running on the same system isn't efficient and that I cannot expect good performance but what I was not expecting is that a guest make host processes hang. Does anyone have an idea what the issue could be here or how I can find out what cause for this behavior is?
Regards, Dennis