System information

Chapter 6. Working with the HMC 203
6.5.6 Working with IOP functions
In this section we discuss operational considerations and actions that can be performed on
IOPs while the system is running.
IOP reset (disk unit IOP reset/reload)
An IOP reset is only valid when certain disk unit subsystem error codes are posted.
This function performs a reset of the disk unit IOP and instructs the IOP to reload its
microcode. See Figure 6-33.
Manually, you can initiate disk unit IOP reset/reload by performing the following steps:
1. Expand Service Applications from the Navigation Area on the left of HMC window, click
Service Focal Point.
2. Click Service Utilities.
3. Select desired system unit, then click the Selected pull down menu to select Operator
Panel Service Functions....
4. Select a partition, and click the Partition Functions pull down menu.
5. Select Disk Unit IOP Reset / Reload (67) - i5/OS.
Figure 6-33 Resetting a disk unit IOP
IOP control storage dump
This function dumps the contents of service processor memory to a predefined space on the
load source disk unit and initiates a reset and reload of the service processor. See
Figure 6-34.
Attention: Perform a disk unit IOP reset under the direction of your next level of support.
Incorrect use of this service tool can result in unnecessary down time and loss of debug
information.
Attention: Perform an IOP control storage dump under the direction of your next level of
support. Incorrect use of this service tool can result in unnecessary down time and loss of
debug information.