nfs:nfs_nra

Description

Controls the number of read-ahead operations that are queued by the NFS version 2 client when sequential access to a file is discovered. These read-ahead operations increase concurrency and read throughput. Each read-ahead request is generally for 8192 bytes of file data.

Data Type

Integer (32–bit)

Default

4

Range

0 to 2³¹ - 1

Units

Read-ahead requests

Dynamic?

Yes

Validation

None

When to Change

Change this parameter to increase or reduce the number of read-ahead requests that are outstanding for a specific file at any given time. For example, for a very low bandwidth network or on a low memory client, you might want to decrease this value so that the NFS client does not overload the network or the system memory. Alternately, if the network is very high bandwidth and the client and server have sufficient resources, you might want to increase this value to more effectively utilize the available network bandwidth and the client and server resources.

Stability Level

Unstable