MAP 4044

Use this MAP to resolve an incorrect or incomplete multipath connection problem.

Use this MAP to resolve the following problems:

  • Configuration error, incorrect multipath connection (SRN nnnn – 4030)
  • Configuration error, incomplete multipath connection between controller and enclosure detected (SRN nnnn – 4040)

The possible causes are:

  • Incorrect cabling to device enclosure.
    Note: Pay special attention to the requirement that a YI-cable must be routed along the right side of the rack frame (as viewed from the rear) when connecting to a disk expansion unit. Review the device enclosure cabling and correct the cabling as required. To see example device configurations with SAS cabling, see Serial attached SCSI cable planning.
  • A failed connection caused by a failing component in the SAS fabric between, and including, the controller and device enclosure.

Considerations:

  • Remove power from the system before connecting and disconnecting cables or devices, as appropriate, to prevent hardware damage or erroneous diagnostic results.
  • Some systems have the disk enclosure or removable media enclosure integrated in the system with no cables. For these configurations the SAS connections are integrated onto the system boards, and a failed connection can be the result of a failed system board or integrated device enclosure.
  • When using SAS adapters in either an HA two-system RAID or HA single-system RAID configuration, ensure that the actions taken in this MAP are against the primary adapter and not the secondary adapter.
  • An adapter reset might occur during the system verification step of this procedure. To avoid potential data loss, reconstruct any degraded disk arrays if possible, before performing system verification.
Attention: Obtain assistance from your Hardware Service Support organization before you replace RAID adapters when SAS fabric problems exist. Because the adapter might contain nonvolatile write cache data and configuration data for the attached disk arrays, additional problems can be created by replacing an adapter when SAS fabric problems exist. Appropriate service procedures must be followed when replacing the cache RAID - dual IOA enablement card (for example, FC5662) because removal of this card can cause data loss if incorrectly performed and can also result in a nondual storage IOA (non-HA) mode of operation.

Step 4044-1

Was the SRN nnnn-4030?

No
Go to Step 4044-4.
Yes
Go to Step 4044-2.

Step 4044-2

Review the device enclosure cabling and correct the cabling as required. To see example device configurations with SAS cabling, see "Serial attached SCSI cable planning.

Step 4044-3

Run diagnostics in system verification mode on the adapter to rediscover the devices and connections.

  1. Start Diagnostics and select Task Selection on the Function Selection display.
  2. Select Run Diagnostics.
  3. Select the adapter resource.
  4. Select System Verification.
Examine the error log. See Examining the hardware error log. Did the error occur again?
No
Go to Step 4044-9.
Yes
Contact your hardware service provider.

Step 4044-4

The SRN is nnnn-4040.

Determine if a problem still exists for the adapter that logged this error by examining the SAS connections as follows:

  1. Start the IBM® SAS Disk Array Manager.
    1. Start Diagnostics and select Task Selection on the Function Selection display.
    2. Select RAID Array Manager.
    3. Select IBM SAS Disk Array Manager.
  2. Select Diagnostics and Recovery Options.
  3. Select Show SAS Controller Physical Resources.
  4. Select Show Fabric Path Graphical View.
Do all expected devices appear in the list and are all paths marked as Operational?
No
Go to Step 4044-5.
Yes
Go to Step 4044-9.

Step 4044-5

Run diagnostics in System Verification mode on the adapter to rediscover the devices and connections.

  1. Start Diagnostics and select Task Selection on the Function Selection display.
  2. Select Run Diagnostics.
  3. Select the adapter resource.
  4. Select System Verification.
Note: At this point, ignore any problems found and continue with the next step.

Step 4044-6

Determine if the problem still exists for the adapter that logged this error by examining the SAS connections as follows:

  1. Start the IBM SAS Disk Array Manager.
    1. Start Diagnostics and select Task Selection on the Function Selection display.
    2. Select RAID Array Manager.
    3. Select IBM SAS Disk Array Manager.
  2. Select Diagnostics and Recovery Options.
  3. Select Show SAS Controller Physical Resources.
  4. Select Show Fabric Path Graphical View.
  5. Select a device with a path that is not Operational (if one exists) to obtain additional details about the full path from the adapter port to the device. See Viewing SAS fabric path information for an example of how this additional detail can be used to help isolate where in the path the problem exists.

Do all expected devices appear in the list and are all paths marked as Operational?

No
Go to Step 4044-7.
Yes
Go to Step 4044-9.

Step 4044-7

Go to SAS fabric identification. Then continue with the next step.

Step 4044-8

Determine if the problem still exists for the adapter that logged this error by examining the SAS connections as follows:

  1. Start the IBM SAS Disk Array Manager.
    1. Start Diagnostics and select Task Selection on the Function Selection display.
    2. Select RAID Array Manager.
    3. Select IBM SAS Disk Array Manager.
  2. Select Diagnostics and Recovery Options.
  3. Select Show SAS Controller Physical Resources.
  4. Select Show Fabric Path Graphical View.
  5. Select a device with a path that is not Operational (if one exists) to obtain additional details about the full path from the adapter port to the device. See Viewing SAS fabric path information for an example of how this additional detail can be used to help isolate where in the path the problem exists.

Do all expected devices appear in the list and are all paths marked as Operational?

No
Go to Step 4044-7.
Yes
Go to Step 4044-9.

Step 4044-9

When the problem is resolved, go to Verifying a repair.