You can use the Netstat command and the DISPLAY TCPIP,,STOR command
to display Shared Memory Communications over RDMA (SMC-R) information.
For more information about these commands, see z/OS Communications Server: IP System Administrator's
Commands.
Netstat ALL/-A report
You can use the Netstat
ALL/-A report to determine whether a TCP connection is using SMC-R
communications. You can filter the report by using the SMCID/-U filter
and specifying an SMC-R link group ID or link ID value as the filter.
When a filter is specified, only those TCP connections that traverse
the specified SMC-R link group or link are displayed.
Netstat ALLConn/-a and Netstat COnn/-c reports
You
can use the Netstat ALLConn/-a and Netstat COnn/-c reports to obtain
TCP connection information. You can filter the reports by using the
SMCID/-U filter and specifying an SMC-R link group ID or link ID value
as the filter. When a filter is specified, only those TCP connections
that traverse the specified SMC-R link group or link are displayed.
Netstat CONFIG/-f report
You can use the Netstat
CONFIG/-f report to display the settings on the GLOBALCONFIG statement,
which includes the SMCR parameter and its subparameters.
Netstat DEvlinks/-d report
You can use the
Netstat DEvlinks/-d report to display whether an IPAQENET or IPAQENET6
interface is eligible for SMC-R, and if so, information about the
associated 10GbE RoCE Express® interfaces
(also referred to as associated RNIC interfaces) that are in use.
The physical network ID (PNetID) is also displayed, which can be useful
in determining why 10GbE RoCE Express interfaces
are not associated.
You can also use the Netstat DEvlinks/-d
report to display information about the SMC-R links and SMC-R link
groups that traverse a 10GbE RoCE Express interface,
including the redundancy level for the link group as described in High availability considerations. To obtain this information,
you must specify the SMC modifier on the Netstat command.
You
can filter the Netstat report by using the SMCID/-U filter and specifying
an SMC-R link ID or link group ID as the filter:
- When an SMC-R link ID is specified, information about that SMC-R
link is displayed, in addition to information about the SMC-R link
group that contains the link.
- When an SMC-R link group ID is specified, information about the
SMC-R link group and all SMC-R links within the group is displayed.
Netstat PORTList/-o report
You can use the
Netstat PORTList/-o report to display the settings of the NOSMCR parameter
for the defined TCP port or range of ports.
Netstat STATS/-S report
You can use the Netstat
STATS/-S report to display SMC-R usage statistics.
- In some cases, the SMC-R statistics are a subset of the overall
TCP statistics of the same name. For example, a value for the field Current
Established Connections is displayed under both TCP
Statistics and SMCR Statistics.
To determine the number of current connections that do not traverse
an SMC-R link, subtract the SMC-R statistics total from the TCP statistics
total.
- In other cases, the SMC-R statistics represent information that
is applicable to SMC-R processing only. For instance, the field Active
SMC Links Opened has no corresponding TCP statistics
value.
- For information about which SMC-R statistics fit in which category
in the Netstat STATS/-S report,
see z/OS Communications Server: IP System Administrator's
Commands.
DISPLAY TCPIP,,STOR output
You can use the
DISPLAY TCPIP,,STOR command to display current SMC-R storage usage.
Values are displayed for remote memory buffers (RMBs), denoted as SMC-R
RECV MEMORY, and staging buffers, denoted as SMC-R
SEND MEMORY. This storage is limited by the setting
of the FIXEDMEMORY subparameter on the GLOBALCONFIG SMCR parameter.
The SMC-R information is displayed only when the SMC-R function is
enabled or was previously enabled for this TCP/IP stack.