[CentOS-virt] disk io in guests causes soft lockups in guests and host processes
dennisml at conversis.de
Thu Feb 20 16:53:47 UTC 2014
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?
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