How you setup connectivity to your NFS server plays a key role in determining throughput. You should know your environment and determine what equipment is between the z/OS host and the NFS server.
Most common network adapters will be OSA Express or LCS adapters. A typical OSA adapter contains between two and four 1 GbE or 1000 BASE-T connections. Some OSA adapters have a single 10 GbE connection. The 1 GbE and 1000 BASE-T connections are capable of up to 125 MB/sec and the 10 GbE is capable up to 1250 MB/sec.
In comparison, a single 3592 is able to write between 60-100 MB/sec. However, most customers are writing with drives at 20-50 MB/sec.
CA Vtape is able to consolidate Backstore activity to just a few Backstore Primary and Failover servers. This means the z/OS connectivity required by the z/OS NFS Client can be consolidated to an LPAR or two. The connectivity required by the z/OS NFS Client can be shared among other z/OS network applications. Adequate network adapter capacity may already exist in your environment.
Where you decide to locate the NFS server is dependent on many factors but most important is whether replication is available on the NFS server.
With replication enabled on the NFS server we recommend locating the NFS server as close to the z/OS host as possible. Locating both on the same LAN segment is best because large packet sizes can best be exploited.
Typically, the replica is sent by the NFS server on a separate network adapter which should be on a different network segment best suited for communicating with the replica NFS server.
If the NFS server is enabled for data de-duplication then only unique data is sent to the replica NFS server resulting in conserving disk space on both servers and network capacity.
Without replication enabled on the NFS server means only one copy of a Virtual Volume will be stored on the NFS server.
Note: We recommend you insure an additional Backstore copy be created on Primary physical tape. The placement of the NFS server can be in the same site or can be located in a different site. The expected throughput will diminish the further the NFS server is located away from the z/OS host. A general rule of thumb is add a millisecond of response for every 100 miles between sites.
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