During IPL, initialization failed for one or more library devices. In many cases, this message is normal and expected. For example, if the interface to a 3490 string is disabled, and the devices were defined with HCD as library devices, those library devices are listed in this message.
Devices that are displayed with an asterisk become available when the error has been corrected, without an IPL or I/O activate request being required.
The device is not available for use by the system.
To determine the reason that a device is unavailable, attempt to vary one of the devices online. If the error has been corrected, the device is brought online. If the error still exists, message IEA437I will explain the reason for the failure. If the device is displayed with an asterisk, it becomes available when the error has been corrected.
If the device is not displayed with an asterisk, perform an IPL or an I/O activate after correcting the error to make the device available to the system after the error has been corrected.
If an I/O activate is to be done, the device must first be varied online. The device does not need to remain online.
Tape Device Initialization Exit (DSE)
IECTDSR2