Initial program load device number and volume
This chapter describes the new message that is used to identify the initial program load (IPL) device and volume.
5.1 IPL device number and volume message
Initially loading an incorrect volume is difficult to detect and can cause errors and slow down the IPL process.
A new message is provided in z/OS V2R2 that includes the wanted device number and volser information, which makes it easier to detect an error. Also, it is easier to associate an archived syslog with a specific set of maintenance on a volume.
Example 5-1 shows the new message that is displayed during IPL, where:
•sdddd is the subchannel set ID and device number that is used for the IPL
•vvvvvv is the volume name of the IPL device
Example 5-1 Sample IOS128I message
IOS128I IPL DEVICE: sdddd VOLUME: vvvvvv
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