In our department we have an Iomega NAS (px4-300d) connected to a Supermicro cluster with 5 nodes (12 cores per node). Each node mounts a share on that NAS by using NFS. Unfortunately after some time (several minutes) of permanent read/write operations (from all nodes) the NAS starts to block and a bit later freezes completely. We tried several options of the mount command, but nothing helped (async, intr, wsize, rsize). The NAS itself doesn't allow many options (better to say none). Do you have any recommendation how to integrate a NAS using NFS in a cluster environment?
If a consumer quality NAS is used in an office environment, you may find that the manufacturer's support won't help you. If this is for a serious enough job that you require support and a NAS that doesn't intermittently fail, you should get the IT team to provide you and support a NAS meant for businesses.
The IOMEGA NAS you're using here is probably at fault, but since there's no way to really manage or repair it, you can only replace it.