Network: Device Bytes

This statistic measures network device activity in bytes/second. Network devices are the physical network ports (see Network Configuration in Oracle ZFS Storage Appliance Administration Guide, Release OS8.8.x). The bytes measured by this statistic include all network payload headers (Ethernet, IP, TCP, NFS, SMB, and so on).

When to Check Device Bytes

Network bytes can be used a rough measure of Oracle ZFS Storage Appliance load. It should also be checked whenever performance issues are investigated, especially for 1 Gbit/sec interfaces, in case the bottleneck is the network device. The maximum practical throughput for network devices in each direction (in or out) based on speed:

• 1 Gbit/sec Ethernet: ~120 Mbytes/sec device bytes

• 10 Gbit/sec Ethernet: ~1.16 Gbytes/sec device bytes

If a network device shows a higher rate than these, use the direction breakdown to see the inbound and outbound components.

Device Bytes Breakdowns

Table 5-34 Breakdowns of Device Bytes

Breakdown	Description
direction	In or out, relative to the Oracle ZFS Storage Appliance system. For example, NFS reads to the appliance would be show as out(bound) network bytes.
device	Network device (see "Devices" in Network Configuration in Oracle ZFS Storage Appliance Administration Guide, Release OS8.8.x).

Further Analysis

See also Network: Interface Bytes for network throughput at the interface level, instead of the device level.