Use the Discovering Managed Disk panel in the SAN Volume
Controller Console to rescan the fibre-channel network. The rescan
discovers any new managed disks (MDisks) that might have been added
to the cluster and rebalances MDisk access across the available controller
device ports.
Introduction
In
general, the cluster automatically detects MDisks that are added to
the network. However, in some cases, the manufacturers of fibre-channel
controllers do not send the required small computer system interface
(SCSI) directives necessary to automatically discover the new MDisks.
Attributes
If
new MDisks are discovered, the following attributes are displayed
in the table:
- Name
- Displays the name of the MDisk.
- State
- Displays the state of the MDisk. The following values are possible:
- Offline
- Indicates the MDisk is offline and unavailable. All paths to this
MDisk have been lost.
- Degraded Paths
- Indicates that the MDisk is not accessible to one or more nodes
in the cluster. Degraded path state is most likely the result of incorrect
configuration of either the disk controller or the fibre-channel fabric.
However, hardware failures in the disk controller, fibre-channel fabric,
or node could also be a contributing factor to this state. Complete
the following actions to recover from this state:
- Verify that the fabric configuration rules for storage systems
are correct.
- Ensure that you have configured the storage system properly.
- Correct any errors in the error log.
- Degraded Ports
- Indicates that one or more 1220 errors have been logged against
the selected MDisk. The 1220 error indicates that the remote fibre-channel
port has been excluded from the MDisk. This error may cause reduced
performance on the storage controller and usually indicates a hardware
problem with the storage controller. To fix this problem you must
resolve any hardware problems on the storage controller and fix the
1220 errors in the error log. To resolve these errors in the log,
select . On
the Maintenance Procedures panel, select Start Analysis.
This action displays a list of unfixed errors that are currently in
the error log. For these unfixed errors, select the error name to
begin a guided maintenance procedure to resolve these errors. Errors
are listed in descending order with the highest priority error listed
first. Highest priority errors should be resolved first.
- Excluded
- Indicates the MDisk has been excluded from use by the cluster
after repeated access errors. Run the directed maintenance procedures
to determine the problem. You can reset an MDisk and include it in
the cluster by running the include task.
- Online
- Indicates the MDisk is online and available. All paths to the
MDisk are available.
- Capacity (MB)
- Displays the capacity of the MDisk in megabytes.
- Controller Name
- Displays the name of the disk controller system that contains
the MDisk.
- Controller LUN Number
- Displays the logical unit number for the MDisk on the disk controller
system.
Actions
The
following actions are available:
- Close
- Click this button to exit this panel.