Best practices, running services on the host, QEMU

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http://www.linuxquestions.org – Hi all, I remember reading in the OpenVZ manual that it was against best practices to run anything apart from OpenVZ on the host. Is this the same for QEMU? I cant find it in their docs. The reason I'm asking is that I need a block level passthrough so I can use the VM as a nfs/glusterfs server... could I run a iSCSI target on the host and an initiator on the guest (I know that itself is against best practices, but I have read up on it and I think it will be fine for my purposes). Or I could just run glusterfs on the host... but that just seems to easy. I'm trying to integrate the storage w (HowTos)