Isilon = Slow Performance - Although a parallel filesystem inside (OneFS), each client node can only talk to a single Isilon node using standard NAS protocols, which then performs parallel I/O across the internal high speed IB network to other Storage Nodes.
- NFS Client nodes (=TSM Server) have to use slow non-parallel data access over Ethernet to the Isilon. NFS v3 is technology from 1986 - designed with networks in mind of that time!!!! - No direct client IB or high-speed network I/O with RDMA enabled to support so single client performance is poor in comparison to other real filesystems that scale. - Multiple NFS mounts from the same client (TSM Server) to the Isilon box can help a little but the setup is clumsy and this is not real parallel I/O - it's a hack! Still slow. - "Magic tools" like dsmisi from (?) can NOT fix this problem, they just hide the multiple NFS mount mess a little bit and cost way to much money. - For backups were large I/O are the norm; NFS is the most inefficient way of using your resources. - Get a real scalable filesystem, use a single mountpoint and drive your networks with optimal I/O speed. -frank- Frank Kraemer IBM Consulting IT Specialist / Client Technical Architect Am Weiher 24, 65451 Kelsterbach mailto:kraem...@de.ibm.com voice: +49-(0)171-3043699 / +4970342741078 IBM Germany
