TUPIP04

Use this procedure to reset an IOP and its attached tape units. Read the (overview) before continuing with this procedure.

If disk units are attached to an IOP, you must power off the system, then power it on to reset the IOP.

If the system has logical partitions, perform this procedure from the logical partition that reported the problem (see Determining if the system has logical partitions).
Is the tape unit powered on?
- No: Continue with the next step.
- Yes: Perform the following:
  1. Press the Unload switch on the front of the tape unit you are working on.
  2. If a data cartridge or a tape reel is present, do not load it until you need it.
  3. Continue with the next step of this procedure.
Verify the following:
- If the external device has a power switch, ensure that it is set to the On position.
- Ensure that the power and external signal cables are connected correctly.
  Note:
  
  For every 8mm and 1/4 inch tape unit, the I/O bus terminating plug for the SCSI external signal cable is connected internally. These devices do not need and should not have an external terminating plug.
Did you press the Unload switch in step 2?
- Yes: Can you enter commands on the command line?
  - Yes: Continue with the next step.
  - No: Go to step 11.
- No: Press the Unload switch on the front of the tape unit you are working on. If a data cartridge or a tape reel is present, do not load it until you need it. Continue with the next step of this procedure.
Has the tape unit operated correctly since it was installed? If you do not know, continue with the next step of this procedure.
- Yes: Continue with the next step.
- No: Go to step 11.
If a system message displayed an I/O processor name, a tape unit resource name, or a device name, record the name for use in the next step. You may continue without a name.
Does the I/O processor give support to only one tape unit? If you do not know, continue with the next step of this procedure.
- No: Continue with the next step.
- Yes: Perform the following. You must complete all parts of this step before you press Enter.
  1. Enter
```
WRKCFGSTS *DEV *TAP ASTLVL(*INTERMED)
```
    (the Work with Configuration Status command) on the command line.
  2. If the device is not varied off, select Vary off before continuing.
  3. Select Vary on for the failing tape unit.
  4. Enter
```
RESET(*YES)
```
    (the Reset command) on the command line.
  5. Press Enter. This ends the procedure.
This step determines if the I/O processor for the tape unit gives support to other tape units or to a disk unit.
Notes:
1. If you cannot determine the tape unit you are attempting to use, go to step 11 (See 11).
2. System messages refer to other tape units that the I/O processor gives support to as associated devices.
Enter WRKHDWRSC *STG (the Work with Hardware Resources command) on the command line.

Did you record an I/O processor (IOP) resource name in step 6?
- No: Perform the following:
  1. Select Work with resources for each storage resource IOP (CMB01, SIO1, and SIO2 are examples of storage resource IOPs).
  2. Find the Configuration Description name of the tape unit you are attempting to use, and then record the Configuration Description names of all tape units that the I/O processor gives support to.
  3. Record whether the I/O processor for the tape unit also gives support to any disk unit resources.
  4. Continue with the next step.
- Yes: Perform the following:
  1. Select Work with resources for that resource.
  2. Record the Configuration description name of all tape units for which the I/O processor provides support.
  3. Record whether the I/O processor for the tape unit also gives support to any disk unit resources.
  4. Continue with the next step.
Does the I/O processor give support to any disk unit resources?
- No: Continue with the next step.
- Yes: The Reset option is not available. Go to step 11.
Does the I/O processor give support to only one tape unit?
- No: Continue with the next step.
- Yes: Perform the following:
  1. Select Work with configuration description and press Enter.
  2. Select Work with status and press Enter.
    Note:
    
    You must complete the remaining parts of this step before you press Enter again.
  3. If the device is not varied off, select Vary off before continuing.
  4. Select Vary on for the failing tape unit.
  5. Enter RESET(*YES) (the Reset command) on the command line.
  6. Press Enter. This ends the procedure.
Perform the following:
1. Enter
```
WRKCFGSTS *DEV *TAP ASTLVL(*INTERMED)
```
  (the Work with Configuration Status command) on the command line.
2. Select Vary off for the failing tape unit and associated devices (the devices you identified in step 7), and then press Enter.
  Note:
  
  You must complete the remaining parts of this step before you press Enter again.
3. Select Vary on for the failing tape unit.
4. Enter
```
RESET(*YES)
```
  (the Reset command) on the command line.
5. Press Enter.
6. Select Vary on for the associated devices (tape units) you identified in step 7. It is not necessary to use the Reset option again.
Does a system message indicate that the vary on operation failed?
- Yes: Continue with the next step.
- No: This ends the procedure.
The Reset is not available, or you were not able to find the Configuration Description name when using
```
WRKHDWRSC *STG
```
(the Work with Hardware Resources command).

You can perform an I/O processor (IOP) reset by performing an IPL of the I/O processor. All devices that are attached to the IOP will reset.

The following steps describe how to load an IOP, how to configure a tape drive, how to vary on tape devices, and how to make tape devices available.
Is the tape device you are working on an 8mm tape drive?
- No: Continue with the next step.
- Yes: Verify the following on the 8mm tape drive:
  - The power and external signal cables are connected correctly.
  - The Power switch is set to the On position (pushed in).
  Note:
  
  The SCSI I/O bus terminating plug for the system-external signal cables is connected internally in the 8mm tape drive. The 8mm tape drive does not need, and must not have an external terminating plug.
  
  Is the 8mm tape drive Power light on, and is the Disturbance light off?
  - Yes: Continue with the next step.
  - No: Go to TUPIP02 to correct the problem. This ends the procedure.
Is a data cartridge or a tape reel installed in the tape device?
- No: Continue with the next step.
- Yes: Remove the data cartridge or tape reel. Continue with the next step.
Can you enter commands on the command line?
- Yes: Continue with the next step.
- No: Perform the following:
  1. Power off the system (see Powering on and powering off).
  2. Power on the system.
  The system performs an IPL and resets all devices. If the tape device responds to SCSI address 7, the system configures the tape device. This ends the procedure.
Verify that automatic configuration is on by entering
```
DSPSYSVAL QAUTOCFG
```
(the Display System Value command) on the command line.

Is the Autoconfigure device option set to 1?
- Yes: Continue with the next step.
- No: Perform the following:
  1. Press Enter to return to the command line.
  2. Set automatic configuration to On by entering
```
CHGSYSVAL QAUTOCFG '1'
```
    (the Change System Value command) on the command line.
    
    Note:
    
    QAUTOCFG resets to its initial value in step 21.
  3. Continue with the next step.
Perform the following:
1. Enter
```
STRSST
```
  (the Start SST command) on the command line.
2. On the Start Service Tools Sign On display, type in a User ID with QSRV authority and Password.
3. Select Start a Service Tool -> Hardware Service Manager -> Logical Hardware Resources -> System Bus Resources. The Logical Hardware Resources on System Bus display shows all of the IOPs.
4. Find the IOP you want to reset. You must ensure that no one is using any of the tape units, communication channels, or display stations that are attached to the IOP you want to reset.
Does a "*" indicator appear to the right of the IOP description?
- No: Continue with the next step.
- Yes: Disk units are attached to the IOP.
  Perform the following:
  1. Press F3 until the Exit System Service Tools display appears.
  2. Press Enter.
  3. Power off the system (see Powering on and powering off).
  4. Power on the system.
  The system performs an IPL and resets all devices. This ends the procedure.
Perform the following:
1. Select I/O debug -> IPL the I/O processor.
2. When the IOP reset is complete, continue with the next step of this procedure.
Perform the following:
1. Press F12 to return to the Logical Hardware Resources on System Bus display.
2. Select Resources associated with IOP for the IOP you reset.
Did the IOP detect the tape unit?
- Yes: Continue with the next step.
- No: The IOP did not detect the tape unit. Consider the following:
  - Ensure that the tape unit is powered on and that the signal cables are connected correctly. If you find and correct a power or a signal cable problem, return to step 16.
  - The tape unit may be failing. Go to the tape unit service information and perform the procedures for analyzing device problems. If you find and correct a tape unit problem, return to step 16.
  - If none of the above are true, ask your next level of support for assistance. This ends the procedure.
Press F3 until the Exit System Service Tools display appears. Then press Enter.
Was automatic configuration Off before you performed step 15?
- Yes: Continue with the next step.
- No: This ends the procedure.
Enter
```
CHGSYSVAL QAUTOCFG '0'
```
(the Change System Value command) on the command line to reset QAUTOCFG to its initial value. This ends the procedure.