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When the active library manager fails in a dual library manager environment, it may
or may not display a message. The standby library manager displays a message
stating that a switch over is being made, which can take approximately 10 minutes
to complete.
Note: Some library manager recovery operations may take longer than expected to
complete. Allow sufficient time for the library manager to complete its switch
over recovery procedures. Seek assistance before interrupting the library
manager recovery operation.
Library Manager Screens (DFSMS/MVS Environment)
A library manager failure causes the library manager console to display certain
messages. If the failure has not affected the display and the display is powered on,
the library manager may have one or more of the following symptoms.
Single Library Manager Configuration::
v ‘Severe execution error’ dialog box
v System hang with non-responsive library manager keyboard or mouse
Note: If this occurs, press Alt-t to make sure the keyboard and display are not
being controlled from the remote console.
v Mode changes which show
Pending
for an excessive length of time
v Error recovery in progress
Dual Library Manager Configuration::
v ‘Switching to active library manager’ dialog box displayed
v ‘Severe execution error’ dialog box
v System hang with non-responsive library manager keyboard or mouse
Note: If this occurs, press Alt-t to make sure the keyboard and display are not
being controlled from the remote console.
v Mode changes which show
Pending
for an excessive length of time
v Error recovery in progress
To manually restart a library manager, go to “Library Manager Action – Library
Manager Recovery Begins (DFSMS/MVS Environment)” on page 263.
Host Messages (DFSMS/MVS Environment)
When the library manager fails, the host operator may or may not see one or more
of the following messages displayed on the host console:
v Library manager CHECK-1 condition
v Library manager equipment check
v Library path check
v Library manager offline
v Library manager switchover in progress
The library manager operator and the host operator should actively communicate
with each other to reduce the amount of down time and ensure the accuracy of this
procedure.
262 Magstar 3494 Tape Library Operator Guide
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