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74 VM/HSC 6.0 System Programmer’s Guide
1st ed., 6/30/04 - 312579601
Operator Intervention - Single LMU Configuration
If the HSC network recovery times out, the ACS is automatically changed to an offline
state and all outstanding LMU requests are purged. After troubleshooting the network
connection, vary the ACS online.
Vary ACS acs-id ONline
Note: During network recovery, the ACS can be forced offline, however, all
outstanding LMU requests are purged. StorageTek recommends that users allow the
HSC network recovery process to remain active and not to force the ACS offline.
Operator Intervention - Dual LMU Configuration
Communication Lost to Master LMU
If network recovery times out on the master LMU, and the HSC is still connected to the
standby LMU, the ACS is still considered in an online state. Issue the SWitch command to
make the current standby LMU the new master LMU.
SWitch Acs acs_id
The HSC redrives requests to the new master LMU.
Communication Lost to Standby LMU
If network recovery times out on the standby LMU, resolve the network problem and IPL
the standby LMU. After the IPL is complete, the master LMU notifies the HSC that the
standby LMU is now ready and network connectivity is reestablished with the standby.
Communication Lost to Both LMUs
If network recovery times out on both LMUs, the ACS is automatically changed to an
offline state and all outstanding LMU requests are purged. After the network problems are
resolved, vary the ACS online.
Note: When network recovery is active on the master and standby LMUs, the ACS
can be forced offline, however, all outstanding LMU requests are purged.
StorageTek recommends that users allow the HSC network recovery process to
remain active and not to force the ACS offline.