что за железо держит iscsi и не держит nfs,
Они считают что NFS не нужен:
After some time passed and our comfort level with ESOS/SCST grew, we realized the next logical step: Highly available storage clusters. We pumped a number of new features (software projects) into ESOS, including, but not limited to DRBD, LVM2, Linux software RAID (md), mhVTL, and a full-featured cluster stack (Pacemaker + Corosync).