MAP 3252

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 the 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 a high availability (HA) two-system RAID or HA single-system RAID configuration, ensure that the actions taken in this MAP are against the primary adapter (not the secondary adapter).
• Before doing the system verification action in this map, reconstruct any degraded disk arrays if possible. This action helps to avoid potential data loss that might result from the adapter being reset during system verification action taken in this map.

Step 3252-1

Determine whether 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 > IBM SAS Disk Array Manager.
2. Select Diagnostics and Recovery Options > Show SAS Controller Physical Resources > Show Fabric Path Graphical View.

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

No

Go to Step 3252-2.

Yes

Go to Step 3252-6.

Step 3252-2

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.

Step 3252-3

Determine whether 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 > IBM SAS Disk Array Manager.
2. Select Diagnostics and Recovery Options > Show SAS Controller Physical Resources > Show Fabric Path Graphical View.
3. Select a device with a path which is not marked as 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 3252-4.

Yes

Go to Step 3252-6.

Step 3252-4

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

1. Power off the system or logical partition.
2. Perform only one of the following corrective actions, which are listed in the order of preference. If one of the corrective actions was previously attempted, proceed to the next action in the list.
   Note: Prior to replacing parts, consider powering off of the entire system, including any external device enclosures, to reset all possible failing components. This action might correct the problem without replacing parts.
   • Reseat the cables on the adapter, on the device enclosure, and between cascaded enclosures if present.
   • Replace the cable from the adapter to the device enclosure, and between cascaded enclosures if present.
   • Replace the device.
     Note: If multiple devices have a path that is not marked as Operational, the problem is not likely to be with a device.
   • Replace the internal device enclosure, or see the service documentation for an external expansion drawer.
   • Replace the adapter.
   • Contact your hardware service provider.
3. 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 3252-5

Determine whether 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 > IBM SAS Disk Array Manager.
2. Select Diagnostics and Recovery Options > Show SAS Controller Physical Resources > Show Fabric Path Graphical View.
3. Select a device with a path which is not marked as 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 3252-4.

Yes

Step 3252-6.

Step 3252-6

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.