User guide

B–SRP Configuration
QLogic SRP Configuration
IB0054606-02 A B-11
Restarting the SRP Module
For changes to take effect, including changes to the SRP map on the VIO card,
SRP will need to be restarted. To restart the
qlgc_srp driver, use the following
command:
/etc/init.d/qlgc_srp restart
Configuring an Adapter with Multiple Sessions
Each adapter can have an unlimited number of sessions attached to it. Unless
round robin is specified, SRP will only use one session at a time. However,
there is still an advantage to configuring an adapter with multiple sessions. For
example, if an adapter is configured with only one session and that session fails,
all SCSI I/Os on that session will fail and access to SCSI target devices will be
lost. While the
qlgc_srp module will attempt to recover the broken session, this
may take some time (e.g., if a cable was pulled, the FC port has failed, or an
adapter has failed). However, if the host is using an adapter configured with
multiple sessions and the current session fails, the host will automatically switch
to an alternate session. The result is that the host can quickly recover and
continue to access the SCSI target devices.
!
WARNING
When using two VIO hardware cards within one Adapter, the cards must
have identical Fibre Channel configurations and maps. Data corruption can
result from using different configurations and/or maps.