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If all types of devices in the boot list have been polled without finding a bootable image, the system
restarts. This action gives the user the opportunity to start the System Management Services (by pressing
the number 1 key on a directly attached keyboard or the number 1 on an ASCII terminal) before the
system attempts to boot again.
Concurrent Mode
Running the online diagnostics in concurrent mode is started by entering diag at an AIX prompt. Use
concurrent mode to run online diagnostics on some of the system resources while the system is running
normal activity.
Because the system is running in normal operation, the following resources cannot be tested in concurrent
mode:
v SCSI adapters connected to paging devices
v Disk drive used for paging
v Some display adapters and graphics related devices
v Memory (tested during POST)
v Processor (tested during POST)
The following levels of testing exist in concurrent mode:
v The share-test level tests a resource while the resource is being shared by programs running in the
normal operation. This testing is mostly limited to normal commands that test for the presence of a
device or adapter.
v The sub-test level tests a portion of a resource while the remaining part of the resource is being used
in normal operation. For example, this test could test one port of a multiport device while the other ports
are being used in normal operation.
v The full-test level requires the device not be assigned to or used by any other operation. This level of
testing on a disk drive might require the use of the varyoff command. The diagnostics display menus to
allow you to vary off the needed resource.
Chapter 6. Using the Online and Standalone Diagnostics
187
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