Changes between Version 3 and Version 4 of rock/paper/PFS_HPC

Timestamp:

Feb 20, 2009, 5:36:16 PM (15 years ago)

Author:

rock

Comment:

--

rock/paper/PFS_HPC

@@ -30 +30 @@
      * Clustered NAS systems were developed to make NAS systems more scalable and to give them more performance
      * Uses several filer heads instead of a single one. The filer heads are then connected to storage.
-     * 2 Arch:
+     * __'''Two Arch:'''__
        1. several file heads each have some storage assigned to them.
-          * This first approach is used by NetApp (NetApp-GX)
-
+          * This first approach is used by !NetApp (!NetApp-GX)
        2. the filer heads are really gateways from the clients to a parallel file system.             
-          * filer heads communicate with the client using NFS over the client network but access the parallel file system
-on a private storage network.
-          * This approach allows the ClusterNAS to be scaled quite large because you can just add more gateways– which
-also increases aggregate performance because there are more NFS gateways.
+          * filer heads communicate with the client using NFS over the client network but access the parallel file system on a private storage network.
+          * This approach allows the ClusterNAS to be scaled quite large because you can just add more gateways– which also increases aggregate performance because there are more NFS gateways.
           * Used by Isilon. And Panasas, IBM’s GPFS, and other parallel file systems when they are running in a NFS mode.
+     * The problem to Clustered NAS devices is that you have limited performance to the client because you are using NFS as the communication protocol. Most of the Cluster NAS solutions use a single GigE connection so you are limited to about 90-100 MB/s at most to each client.