Some instances, the iscsi connection fails. This may be due to swap space. Adding a swap file can help. How to create a swap file. Pre-9.3 NAS loses iSCSI or NFS/CIFS connectivity arbitrarily From NAS /var/log/messages: Aug 15 22:24:01 nas kernel: pid 29173 (smbd), uid 65534, was killed: out of swap space Aug 15 22:27:11 ..