MAP 3131

Use this MAP to resolve the following problem: Required cache data cannot be located for one or more disks (SRN nnnn-9050) for a PCI-X or PCIe controller.

Step 3131-1

Did you just exchange the adapter as the result of a failure?
No
Go to Step 3131-6.
Yes
Go to Step Step 3131-2.

Step 3131-2

Is the adapter connected in an HA RAID configuration (that is, two adapters connected to the same set of disks)?
No
Go to Step 3131-3.
Yes
Contact your hardware service provider.

Step 3131-3

Are you working with a 572F/575C card set?
No
Go to Step 3131-5.
Yes
Go to Step Step 3131-4.

Step 3131-4

Note: Label all parts (original and new) before moving them.
Using the appropriate service procedures, remove the 572F/575C card set. Create and install the new card set that has the following parts installed on it:
  • The new replacement 572F storage I/O adapter
  • The cache directory card from the original 572F storage I/O adapter
  • The original 575C auxiliary cache adapter
Note: See the figures at Separating the 572F/575C card set and moving the cache directory card to locate the relevant parts of the card.

Go to Step 3131-11

Step 3131-5

Notes:
  1. The failed adapter that you have just exchanged contains cache data that is required by the disks that were attached to that adapter. If the adapter that you just exchanged is failing intermittently, reinstalling it and IPLing the system might allow the data to be successfully written to the disks. After the cache data is written to the disks and the system is powered off normally, the adapter can be replaced without data being lost. Otherwise, continue with this procedure.
  2. Label all parts (old and new) before moving them.
Using the appropriate service procedures, remove the I/O adapter. Install the new replacement storage I/O adapter with the following parts installed on it:
  • The cache directory card from the original storage I/O adapter. See the figures at Replacing the cache directory card to identify the relevant locations on the card.
  • The removable cache card from the original storage I/O adapter, if the original storage I/O adapter has a removable cache card. Verify that the storage I/O adapter is listed in the feature comparison tables for PCIe and PCI-X cards as having Yes in the Removable Cache Card column.

Go to Step 3131-11.

Step 3131-6

Identify the affected disks by examining the hardware error log. The hardware error log can be viewed as follows:

  1. Follow the steps in Examining the hardware error log and return here.
  2. Select the hardware error log to view.

    Viewing the hardware error log, the Device Errors Detected field indicates the total number of disks which are affected. The Device Errors Logged field indicates the number of disks for which detailed information is provided. Under the Original Device heading, the Resource, Vendor/Product ID, S/N, and World Wide ID are provided for up to three disks. Additionally, the Original Controller Type, S/N, and World Wide ID for each of these disks indicates the adapter to which the disk was last attached when it was operational. Refer to SAS resource locations to understand how to locate a disk using the Resource field.

  3. Go to Step 3131-7.

Step 3131-7

Have the adapter or disks been physically moved recently?
No
Contact your hardware service provider
Yes
Go to Step 3131-8

Step 3131-8

Is the data on the disks needed for this or any other system?

No
Go to Step 3131-10
Yes
Go to Step 3131-9

Step 3131-9

The adapter and disks, identified previously, must be reunited so that the cache data can be written to the disks.

Restore the adapter and disks back to their original configuration. Once the cache data is written to the disks and the system is powered off normally, the adapter and/or disks can be moved to another location.

When the problem is resolved, see the removal and replacement procedures topic for the system unit on which you are working and do the "Verifying the repair" procedure.

Step 3131-10

Perform only one of the following options, listed in the order of preference:

Option 1
Reclaim controller cache storage by performing the following steps:
Attention: All data on the disk array will be lost.
  1. Start the IBM® SAS Disk Array Manager.
    1. Start AIX diagnostics and select Task Selection on the Function Selection display.
    2. Select RAID Array Manager > IBM SAS Disk Array Manager.
  2. Select Diagnostics and Recovery Options > Reclaim Controller Cache Storage > IBM SAS RAID Controller.
  3. Confirm to Allow Unknown Data Loss.
  4. Confirm to proceed.

When the problem is resolved, see the removal and replacement procedures topic for the system unit on which you are working and do the "Verifying the repair" procedure.

Option 2
If the disks are members of a disk array, delete the disk array by doing the following steps:
Attention: All data on the disk array will be lost.
  1. Start the IBM SAS Disk Array Manager as follows:
    1. Start Diagnostics and select Task Selection on the Function Selection display.
    2. Select RAID Array Manager > IBM SAS Disk Array Manager.
  2. Select Delete a SAS Disk Array > IBM SAS RAID Controller.
  3. Select the disk array to delete.

When the problem is resolved, see the removal and replacement procedures topic for the system unit on which you are working and do the "Verifying the repair" procedure.

Option 3
Format the disks, as follows:
Attention: All data on the disk array will be lost.
  1. Start the IBM SAS Disk Array Manager as follows:
    1. Start Diagnostics and select Task Selection on the Function Selection display.
    2. Select RAID Array Manager > IBM SAS Disk Array Manager.
  2. Select Diagnostics and Recovery Options > Format Physical Disk Media (pdisk).

When the problem is resolved, see the removal and replacement procedures topic for the system unit on which you are working and do the "Verifying the repair" procedure.

Step 3131-11

Has a new SRN nnnn-9010 or nnnn-9050 occurred?
No
Go to Step 3131-13
Yes
Go to Step 3131-12

Step 3131-12

Was the new SRN nnnn-9050?

No
The new SRN was nnnn-9010.
Reclaim the controller cache storage as follows:
Attention: Data might be lost. When an auxiliary cache adapter connected to the RAID controller logs an nnnn - 9055 SRN in the hardware error log, the reclaim process does not result in lost sectors. Otherwise, the reclaim process does result in lost sectors.
  1. Start the IBM SAS Disk Array Manager.
    1. Start AIX diagnostics and select Task Selection on the Function Selection display.
    2. Select RAID Array Manager > IBM SAS Disk Array Manager.
  2. Select Diagnostics and Recovery Options > Reclaim Controller Cache Storage > IBM SAS RAID Controller.
  3. Confirm to proceed.
    Note: On the Reclaim Controller Cache Storage results display, the number of lost sectors is displayed. If the number is 0, there is no data loss. If the number is not 0, data has been lost and the system operator might want to restore data after this procedure is completed.
  4. Go to Step 3131-13
Yes
Contact your hardware service provider.

Step 3131-13

Are you working with a 572F/575C card set?
No
Go to Step 3131-15
Yes
Go to Step 3131-14

Step 3131-14

Note: Label all parts (original and new) before moving them.
Using the appropriate service procedures, remove the 572F/575C card set. Create and install the new card set that has the following parts installed on it:
  • The new 572F storage I/O adapter
  • The cache directory card from the new replacement 572F storage I/O adapter
  • The new 575C auxiliary cache adapter
Note: See the figures at Separating the 572F/575C card set and moving the cache directory card to locate the parts appearing in the preceding list.

When the problem is resolved, see the removal and replacement procedures topic for the system unit on which you are working and do the "Verifying the repair" procedure.

Step 3131-15

Using the appropriate service procedures, remove the I/O adapter. Install the new replacement storage I/O adapter with the following parts installed on it:
  • The cache directory card from the new storage I/O adapter. Refer to Replacing the cache directory card.
  • The removable cache card from the new storage I/O adapter. This only applies to certain adapters which have a removable cache card. Verify that the storage I/O adapter is listed in the feature comparison tables for Table 1 and PCI-X cards as having Yes in column for Removable Cache Card.

When the problem is resolved, see the removal and replacement procedures topic for the system unit on which you are working and do the "Verifying the repair" procedure.

Parent topic: Controller maintenance analysis procedures


Last updated: Wed, May 24, 2017