StorageTek 6 Operator Intervention - Single LMU Configuration, Communication Lost to Master LMU

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.

74VM/HSC 6.0 System Programmer’s Guide

1st ed., 6/30/04 - 312579601