A set of expansion enclosures (one or more expansion enclosures that are on the same loop) has multiple connections to a RAID controller module. The Recovery Guru Details area provides specific information you will need as you follow the Recovery Steps.
Caution: Possible loss of data accessibility.
It is very important that you resolve this miswire problem along with
any other miswire problem that is reported in the Summary area before
attempting to resolve any other problem that is being reported in the
Summary area. Resolving non-miswire problems with miswire problems
still present can lead to a loss of data accessibility.
This configuration is currently not redundant because a loop of expansion enclosures should have one connection to EACH RAID controller module. The alternate RAID controller module will not be able to access the data on the physical disks if the connected RAID controller module fails.
| 1 | Use the information provided in the Recovery Guru Details area to determine which physical disk
expansion ports are miswired.
Note: Select the Storage Array >> View >> Connections menu option for a table of the connections between the RAID controller module and the expansion enclosures. Trace the cables from the RAID controller module enclosure's miswired physical disk channel connections to the connected EMM module. Follow the cable paths until you find a connection where two different physical disk ports from the same RAID controller module are connected to the same set of expansion enclosures (one or more expansion enclosures that are on the same loop) . The following example shows a common miswire configuration:
In the example above, two physical disk ports from the same RAID controller module are connected to both EMM modules in the same expansion enclosure. If you lose access to this RAID controller module, then you will also lose access to this expansion enclosure. This problem can also happen when multiple expansion enclosures are looped together. |
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| 2 | Reconnect the cables so that each path in the
physical disk loop is connected to a different RAID controller module. Use the interface cable routing examples in the Hardware Cabling Guide as a reference for correct cabling.
The following example shows the corrected cable configuration from the previous example.
In the corrected configuration, if you lose access to one of the RAID controller modules, you will still have access to the expansion enclosure through the alternate RAID controller module. |
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| 3 | Click the Recheck button to rerun the Recovery Guru. The failure should no longer appear in the Summary area. If the failure appears again, contact your technical support representative. |
