[Users] VM Pausing with Storage IO errors

Hi, I have a ovirt 3.2.1 system that has a single VM which pauses soon after launch with the message "VM has been paused due to storage IO error". When it first occured it mentioned an issue with no storage. This is weird as it says I have over half of my 4TB iscsi pool free. I have checked the SAN, hosts and engine logs. I haven't been able to find anything that indicates the cause. Is anyone able to at least point me in the direction I should look further? Details : 3x Dell R720 VM Nodes (Dual Proc Sandy bridge Xeon, 96gb ram, boot from SAN) Dell MD 3220i iSCSI storage array Hosts are runing CentOS 6.4 VDSM : vdsm-4.10.3-0.36.23.el6 libvirt : libvirt-0.10.2-18.el6_4.8 kernel : 2.6.32 - 358.11.1.el6.x86_64 kvm : 0.12.1.2 - 2.355.el6.5 Engine is : oVirt Engine Version: 3.2.2-1.1.43.el6