You can view the managed disks (MDisks) in a cluster and
information about the MDisks from the Viewing Managed Disks panel
in the SAN Volume Controller Console. You can view all modes of MDisks,
including MDisks that are in the managed, unmanaged,
or image modes.
Attributes
The
following attributes are displayed in the table:
- Select
- Allows you to select an MDisk to use to perform an action from
the task list.
Note: Only one row can be selected at a time.
- Copy
- Displays the system-assigned identifier for the mirrored copy
of a virtual disk (VDisk).
Note: This option is displayed when you
select the Show MDisks this VDisk is Using action
from the Viewing VDisks panel.
- Name
- Displays the name of the MDisk.
- State
- Displays the state of the MDisk. The following values are possible:
- Online
- Indicates that the MDisk is online and available. All paths to
the MDisk are available.
- 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 that 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.
- Offline
- Indicates that the MDisk is offline and unavailable. All paths
to this MDisk have been lost.
- Mode
- Displays the access mode of the MDisk. The following values are
possible:
- Unmanaged
- Indicates that the MDisk is not used by the cluster.
- Managed
- Indicates that the MDisk is assigned to an MDisk group and is
providing extents that VDisks can use.
- Image
- Indicates that the MDisk is assigned directly to a VDisk with
a one-to-one mapping of extents between the MDisk and the VDisk.
- MDisk Group ID
- Displays the system-assigned ID for the MDisk group that contains
the MDisk.
- MDisk Group Name
- Displays the name of the MDisk group that contains the MDisk.
- Capacity
- Displays the capacity of the MDisk.
- Controller
- Displays the name of the disk controller system that contains
the MDisk.
- Controller LUN Number
- Displays the LUN number for this MDisk.
Actions
You
can select one of the following tasks from the task list:
Note: With the exception of the Create an Image-Mode
VDisk task, you must first select an MDisk before you
can select a task.
- Go
- Click this button after selecting a task from the task list. Clicking Go launches
the panel for the task that you selected.
- Refresh
- Click this button to refresh the table with changed values.