Managing network resources in Solaris 11 using “dlstat” and “flowstat”
The 2 important commands to manage network resources in Solaris 11 are “dlstat” and “flowstat”. The post is a short note on the usage of these commands to display and manage network resources.
dlstat Command
The dlstat command reports runtime statistics about datalinks. The output is sorted in descending order of link utilization. dlstat enables you to:
- Examine all links and reports statistics
- Examine a specific link and reports statistics
- Examine physical network devices and reports statistics
- Examine link aggregations and reports statistics
- Specify the sampling interval and count values
dlstat: Examples
The section shows examples of dlstat usage. In the first example, running dlstat without subcommands displays a summary of statistics for all the links. The report shows incoming traffic (IPKTS and RBYTES) and outgoing traffic (OPKTS and OBYTES).
# dlstat LINK IPKTS RBYTES OPKTS OBYTES net1 0 0 0 0 net2 0 0 0 0 net3 0 0 155 10.43K net0 0 0 6.73K 765.05K speedway0 59.02K 5.93K 115.69K 148.09M
In the second example, the show-phys subcommand reports network traffic statistics for each physical network device. Note that if your link aggregations (speedway0) are present, they are also displayed.
# dlstat show-phys LINK IPKTS RBYTES OPKTS OBYTES net1 2.90K 501.69K 9.02K 5.03M net2 4.78K 627.83K 16.47K 20.59M net3 10.73K 1.34M 26.00K 32.64M net0 49.49K 4.45M 70.83K 90.65M
The show-link subcommand reports network traffic statistics for each network link, whereas the show-aggr subcommand reports incoming and outgoing network traffic statistics for aggregated links. The PORT field indicates the devices that make up the link aggregation.
# dlstat show-link LINK IPKTS RBYTES OPKTS OBYTES net1 0 0 0 0 net2 0 0 0 0 net3 0 0 155 10.43K net0 0 0 6.73K 765.06K speedway0 59.16K 5.94K 115.75K 148.09M
# dlstat show-aggr LINK LINK PORT IPKTS RBYTES OPKTS OBYTES speedway0 -- 68.08K 6.93M 122.66K 148.92M speedway0 net0 49.59K 4.46M 70.84K 90.65M speedway0 net1 2.92K 505.13K 9.05K 5.03M speedway0 net2 4.81K 631.91K 16.76K 20.59M speedway0 net3 10.76K 1.34M 26.01K 32.64M
# dlstat show-bridge
BRIDGE LINK IPKTS RBYTES OPKTS OBYTES DROPS FORWARDS
tonowhere -- 2 191 9 702 0 0
net0 2 191 6 447 0 --
net3 0 0 3 255 0 --
flowstat Command
Flows consist of network packets that are organized according to an attribute. Flows enable you to further allocate network resources. Packets traverse a path when they flow into or out of a system. On a granular level, packets are received and transmitted through receive (Rx) rings and transmit (Tx) rings of an NIC. From these rings, received packets are passed up the network stack for further processing while outbound packets are sent to the network.
Flowstat Enables you to gather runtime statistics on user-defined flows. Using flowstat, you can:
- Display receive-side statistics only (includes bytes)
- Display transmit-side statistics only
- Specify an interval in seconds at which statistics are refreshed along with a count value. The default interval is one second.
- Display statistics for all flows on the specified link or statistics for the specified flow
flowstat: Examples
1. Below example shows information every second about incoming and outgoing traffic on all configured flows on the system.
# flowstat 1 1 FLOW IPKTS RBYTES IDROPS OPKTS OBYTES ODROPS http1 430.45K 910.46M 0 398.22K 44.09M 0
2. The second example shows receive-side statistics for all flows.
# flowstat -r FLOW IPKTS RBYTES IDROPS http1 2.95M 3.44M 0
3. The third example shows transmit-side statistics for all flows.
# flowstat -t FLOW OPKTS OBYTES ODROPS http1 17.89M 987.22M 0
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