User Manual

Rev 2.3-1.0.1
Mellanox Technologies
167
• Executing srp_daemon over a port without the -a option will only display the reachable
targets via the port and to which the initiator is not connected. If executing with the -e
option it is better to omit -a.
• It is recommended to use the -n option. This option adds the initiator_ext to the connecting
string. (See Section for more details).
• srp_daemon has a configuration file that can be set, where the default is /etc/
srp_daemon.conf. Use the -f to supply a dif
ferent configuration file that configures the tar-
gets srp_daemon is allowed to connect to. The configuration file can also be used to set
values for additional parameters (e.g., max_cmd_per_lun, max_sect).
• A continuous background (daemon) operation, providing an automatic ongoing detection
and connection capability
. See Section .
Automatic Discovery and Connection to Targets
• Make sure that the ib_srp module is loaded, the SRP Initiator can reach an SRP Target,
and that an SM is running.
• To connect to all the existing Targets in the fabric, run “
srp_daemon -e -o”. This utility
will scan the fabric once, connect to every Target it detects, and then exit.
srp_daemon will follow the configuration it finds in /etc/srp_daemon.conf. Thus, it
will ignore a target that is disallowed in the configuration file.
• To connect to all the existing Targets in the fabric and to connect to new targets that will
join the fabric, execute srp_daemon -e. This utility continues to execute until it is either
killed by the user or encounters connection errors (such as no SM in the fabric).
• To execute SRP daemon as a daemon on all the ports:
•
srp_daemon.sh (found under /usr/sbin/). srp_daemon.sh sends its log to /var/log/
srp_daemon.log
.
• Start the srpd service script, run
service srpd start
• It is possible to configure this script to execute automatically when the InfiniBand driver
starts by changing the value of SRP_DAEMON_ENABLE in /etc/infiniband/
openib.conf to “yes”. However, this option also enables SRP High Availability that has
some more features – see Section , “High Availability (HA)”, on page 168).
For the changes in
openib.conf to take effect, run:
/etc/init.d/openibd restart
Multiple Connections from Initiator InfiniBand Port to the Target
Some system configurations may need multiple SRP connections from the SRP Initiator to the
same SRP
Target: to the same Target IB port, or to different IB ports on the same Target HCA.
In case of a single Target IB port, i.e., SRP connections use the same path, the configuration is
enabled using a dif
ferent initiator_ext value for each SRP connection. The initiator_ext value is a
16-hexadecimal-digit value specified in the connection command.
Also in case of two physical connections (i.e., network paths) from a single initiator IB port to
two dif
ferent IB ports on the same Target HCA, there is need for a different initiator_ext value on