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Oracle® ZFS Storage Appliance Analytics Guide, Release OS8.7.x

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Updated: August 2017

Protocol: NFSv[2-4] Bytes

This statistic shows NFSv[2-4] bytes/sec transferred between NFS clients and the appliance. Supported NFS versions are: NFSv2, NFSv3, NFSv4.0, and NFSv4.1. Bytes statistics can be broken down by: operation, client, filename, share, and project.

When to Check NFSv[2-4] Bytes

NFSv[2-4] bytes/sec can be used as an indication of NFS load. The best way to improve performance is to eliminate unnecessary work, which may be identified through the client and filename breakdowns, and the filename hierarchy view. Client and especially filename breakdowns can be very expensive in terms of storage and execution overhead. Therefore, it is not recommended to permanently enable these breakdowns on a busy production appliance.

NFSv[2-4] Bytes Breakdowns

Table 43  Breakdowns of NFS Bytes
type of operation
NFS operation type (read/write/getattr/setattr/lookup/...)
Remote hostname or IP address of the NFS client
Filename for the NFS I/O, if known and cached by the appliance. There are some circumstances where the filename is not known, such as after a cluster failover and when clients continue to operate on NFS filehandles without issuing an open to identify the filename; in these situations the filename reported is "<unknown>".
Application ID
Identity of the client application issuing the I/O. This breakdown is available only for OISP-enabled NFSv4.0 and NFSv4.1 clients.
The share for this NFS I/O
The project for this NFS I/O

These breakdowns can be combined to produce powerful statistics. For example, use "Protocol: NFSv3 bytes per second for client hostname.example.com broken down by filename" to view which files a particular client is accessing.

Further Analysis

See Network: Device Bytes for a measure of network throughput caused by the NFS activity; Cache: ARC Accesses to learn how well an NFS read workload is returning from cache; and Disk: I/O Operations for the back-end disk I/O caused.