Failed Minihub Canister

What Caused the Problem?

Communications with the minihub canister has been lost. This may be the result of a minihub canister failure, a controller failure, or a failure in an internal backplane communications board. If there is only one minihub failure, the storage subsystem is still operational. The Recovery Guru Details area provides specific information you will need as you follow the recovery steps.

Caution
Electrostatic discharge can damage sensitive components. Use a grounding wrist strap or other anti-static precautions before removing or handling components.

Important Notes

Recovery Steps

1

Remove the failed minihub canister (its fault indicator should be on).

2

Insert a new canister securely into place.

3

Select Recheck to rerun Recovery Guru to ensure that the failure has been fixed.

If

Then

The failure is fixed.

You are done with this procedure.

The failure is not fixed.

Follow the procedure in steps 4 - 10.

Note: If the minihub canister has failed on the host side, the Recovery Guru details area will indicate which controller (A or B) is connected to the failed minihub canister.

Note: If the minihub canister has failed on the drive side, you cannot identify the controller connected to the failed minihub. Start by replacing the controller in slot A.

4

In the physical view of the Subsystem Management Window, highlight the affected controller and select Controller>>Place Offline.

Note: The transition to Offline may take several minutes. During the transition, arrays assigned to the controller are assigned to the other controller. This does not affect data flow. Wait until the controller changes to Offline before continuing.

5

Remove the Offline controller. Wait at least one minute before inserting the new controller.

Note: Before you insert a new controller canister into a Directly Managed storage subsystem (refer to the Network Management Type column in the Enterprise Management Window), you must update the DHCP/BOOTP server so that it will associate the new controller's hardware Ethernet address with the host name and IP address previously assigned to the removed controller.
To update the DHCP/BOOTP server, find the entry associated with the removed controller and replace its Ethernet address with the new controller's Ethernet address. The controller's Ethernet address is located on an Ethernet ID label on the controller canister in the form xx.xx.xx.xx.xx.xx. If you need more details, consult the Storage System Planning Guide.

6

Insert the new controller firmly into the controller enclosure.

7

Highlight the controller in the Physical View of the Subsystem Management Window, Then select Controller>>Place Online.

Note: The transition to Online may take several minutes. Wait until the controller changes to Online before continuing.

8

Highlight the controller in the Physical View of the Subsystem Management Window, then select Controller>>Change Mode.

If...

Then...

The controller's Mode is Passive

Change the controller to Active. Then, go to Step 9.

The controller's Mode is Active

Go to Step 9.

9

Remove the minihub canister you just installed in step 2, wait 30 seconds, and then install it again.

10

Select Recheck to rerun Recovery Guru to ensure that the failure has been fixed.

If

Then

The failure is fixed.

Locate the Automatic Logical Drive Transfer (ADT) entry in the storage subsystem profile. To open the profile select the Storage Subsystem>>Profile menu option from the Subsystem Management Window.

If...

Then...

The Auto Logical Drive Transfer (ADT) entry is set to Disabled

OR

You ARE NOT running a host based, multi-path driver

Redistribute the logical drives to their preferred controller by selecting Storage Subsystem>>Redistribute Logical Drives from the Subsystem Management Window.

The Auto Logical Drive Transfer (ADT) entry is set to Enabled

AND

You ARE running a host based, multi-path driver

No action is required.

The host based, multi-path driver will automatically initiate a transfer of logical drives to their preferred controller.

Note that detection of a restored preferred path by the multi-path driver can take up to 10 minutes.

The failure is not fixed and the failed minihub canister was on the drive side.

Replace the controller in slot B using steps 4 - 10.

Note: If you have already replaced the controller in slot B, you may have a problem with the internal backplane communications board. Contact your technical support representative.

The failure is not fixed and the failed minihub canister was on the host side.

You may have a problem with the internal backplane communications board. Contact your technical support representative.