MAP 3146

Use this MAP to resolve the following problem: Configuration error, incomplete multipath connection between enclosures and device detected (SRN nnnn - 4041)

The possible cause is a failed connection caused by a failing component within the device enclosure, including the device itself.

Note: The adapter is not a likely cause of this problem.

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.
Some configurations involve a SAS adapter connecting to internal SAS disk enclosures within a system using a FC3650 or FC3651 cable card. Keep in mind that when the MAP refers to an device enclosure, it could be referring to the internal SAS disk slots or media slots. Also, when the MAP refers to a cable, it could include a FC3650 or FC3651 cable card.
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.
Before executing the system verification action in this map, reconstruct any degraded disk arrays if possible. This will help avoid potential data loss resulting from the adapter reset performed during system verification action taken in this map.

Attention: Removing functioning disks in a disk array is not recommended without assistance from your Hardware Service Support organization. A disk array might become degraded or failed if functioning disks are removed and additional problems might be created.

Step 3146-1

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

Start the IBM® SAS Disk Array Manager.
1. Start Diagnostics and select Task Selection on the Function Selection screen.
2. Select RAID Array Manager.
3. Select IBM SAS Disk Array Manager.
Select Diagnostics and Recovery Options.
Select Show SAS Controller Physical Resources.
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 3146-2.
Yes: Go to Step 3146-6.

Step 3146-2

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

Start Diagnostics and select Task Selection on the Function Selection screen.
Select Run Diagnostics.
Select the adapter resource.
Select System Verification.

Note: At this point, disregard any problems found, and continue with the next step.

Step 3146-3

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

Start the IBM SAS Disk Array Manager.
1. Start Diagnostics and select Task Selection on the Function Selection screen.
2. Select RAID Array Manager.
3. Select IBM SAS Disk Array Manager.
Select Diagnostics and Recovery Options.
Select Show SAS Controller Physical Resources.
Select Show Fabric Path Graphical View.
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. Refer to 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?

Yes: Go to Step 3146-6.
No: Go to Step 3146-4.

Step 3146-4

Because the problem persists, some corrective action is needed to resolve the problem. Proceed by doing the following:

Power off the system or logical partition.
Perform only one of the corrective actions listed below, which are listed in the order of preference. If one of the corrective actions has previously been attempted, then proceed to the next one in the list.
Note: Prior to replacing parts, consider using a complete shutdown to power off the entire system, including any external device enclosures, to provide a reset of all possible failing components. This might correct the problem without replacing parts.
- 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.
- Reseat cables on adapter and device enclosure.
- Replace cable from adapter to device enclosure.
- Replace the internal device enclosure or refer to the service documentation for an external expansion drawer.
- Replace the adapter.
- Contact your hardware service provider.
Power on the system or logical partition.
Note: In some situations, it might be acceptable to unconfigure and reconfigure the adapter instead of powering off and powering on the system or logical partition.

Step 3146-5

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

Start the IBM SAS Disk Array Manager.
1. Start Diagnostics and select Task Selection on the Function Selection screen.
2. Select RAID Array Manager.
3. Select IBM SAS Disk Array Manager.
Select Diagnostics and Recovery Options.
Select Show SAS Controller Physical Resources.
Select Show Fabric Path Graphical View.
Select a device with a path which is not Operational (if one exists) to obtain additional details about the full path from the adapter port to the device. Refer to 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 3146-4.
Yes: Go to Step 3146-6.

Step 3146-6

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.