| | 1 | * Clustered NAS systems were developed to make NAS systems more scalable and to give them more performance |
| | 2 | * Uses several filer heads instead of a single one. The filer heads are then connected to storage. |
| | 3 | * __'''Two Arch：'''__ |
| | 4 | 1. several file heads each have some storage assigned to them. |
| | 5 | * First approach is used by !NetApp (!NetApp-GX) |
| | 6 | 2. the filer heads are really gateways from the clients to a parallel file system. |
| | 7 | * filer heads communicate with the client using NFS over the client network but access the parallel file system on a private storage network. |
| | 8 | * 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. |
| | 9 | * Used by Isilon. And Panasas, IBM’s GPFS, and other parallel file systems when they are running in a NFS mode. |
| | 10 | * The problem 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. |
