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There are many io generators available. The simplest is dd then going up to packages like bonnie++ and fio

dd if=/dev/zero of=1g.bin bs=1G count=1

On the hypervisor you have tools like iotop and sar to monitor the IO load the vm in generating. If its a network volume (ceph/iscsi for example) can use iftop to see the network working as well

Hope that helps