Use the Viewing VDisk panel in the SAN Volume Controller Console to
display all the virtual disks (VDisks) that belong to a cluster.
Introduction
Virtual
disks (VDisks) are logical disks that are created from the extents
of MDisks. Only MDisks that are in the same MDisk group can contribute
extents to a VDisk.
To learn
more about VDisks, click View Tutorial to launch the Using virtual
disks e-Learning module that explains different types of VDisks, space-efficient
VDisks, VDisk mirroring, and other concepts that are related to VDisks.
Attributes
The
following attributes are displayed in the table:
- Select
- Allows you to select the VDisk to use to perform an action from
the task list.
Note: Only one row can be selected at a time.
- Name
- Displays the name of the VDisk.
- State
- Displays the state of the VDisk. The following values are possible:
- Offline
- Indicates that the VDisk is unavailable. One or more of the managed
disks (MDisks) that make up the VDisk are degraded or offline and
consequently the VDisk is unavailable.
- Online
- Indicates that the VDisk is available. All the MDisks that make
up the VDisk are available.
- Degraded
- Indicates that the status of the VDisk is degraded. A VDisk is
degraded if the VDisk is online to one node and offline to the other
node or if the VDisk is online to one node and the other node is missing.
The status of a VDisk is online if the MDisk group that is presenting
the VDisk is online.
- Fast Write State
- Indicates if the VDisk has data in the cache. The value of this
option can help determine whether any recovery action is necessary
for VDisks.
- Empty
- Indicates that the VDisk does not have outstanding data in the
cache. This indicates that the data has not been corrupted and does
not need any recovery action.
- Not Empty
- Indicates that the VDisk has unwritten data in the cache.
- Corrupt
- Indicates that the VDisk has lost cache data or space-efficient
directory metadata, usually as the result of the I/O group going offline.
To recover this lost data, you can use Recover VDisks or Recover All
Corrupted VDisks from the task list on this panel to restore the lost
data and bring the VDisk back online.
- Repairing
- Indicates that the VDisk is space-efficient or has space-efficient
copies and is being held offline while its metadata is repaired. This
state follows from one of the VDisk recovery tasks.
- I/O Group
- Displays the name of the I/O group that contains this VDisk. You
can use the Recover VDisks, Recover All Corrupted VDisks, or Recover
VDisks by I/O Group panels to recover a VDisk and bring it back online.
- MDisk Group
- Displays the name of the MDisk group that contains this VDisk.
The
value Many indicates that this VDisk has multiple
copies, which can be on different MDisks. Click the link in this field
to display the View VDisk Copy Details panel
for more details on the MDisk that is used by each of the VDisk copies.
- Capacity (MB)
- Displays the size of the VDisk in megabytes.
- Space-efficient
- Displays whether the VDisk is space-efficient. A space-efficient
VDisk has different virtual capacity and real capacity. In a standard
VDisk, the virtual capacity and real capacity are the same. The following
values are possible:
- Yes
- Indicates that the VDisk is space-efficient.
- No
- Indicates that the VDisk is not space-efficient.
- Type
- Displays the VDisk type. The following values are possible:
- Striped
- Indicates that the VDisk was created from multiple MDisks that
are in the MDisk group. Extents are allocated on the MDisks in the
specified order.
- Sequential
- Indicates that the VDisk was created from one MDisk that is in
the MDisk group. Extents are sequentially allocated on the MDisk.
- Image
- Indicates that the VDisk was created from one MDisk that is in
the MDisk group. Provides a direct block-for-block translation from
the MDisk to the VDisk. This is intended for MDisks that already contain
data that was not written through the SAN Volume Controller.
- Many
- Indicates that the VDisk has multiple copies, which can have different
types. Click the link to determine the type for each of the VDisk
copies.
- Hosts
- Displays if the selected VDisk is mapped to the host. The possible
values are:
- Mapped
- Indicates that the VDisk is mapped to a host.
- –
- Indicates that the VDisk is not mapped to a host.
- FC Pair
- Displays the name of the FlashCopy® mapping that this
VDisk is part of. The term Many might be
displayed if the VDisk belongs to more than one mapping.
- FC Map Count
- Displays the number of FlashCopy mappings that this
VDisk belongs to.
- Relationship Name
- Displays the name of Metro or Global Mirror mappings
that this VDisk belongs to.
- UID
- Displays the unit identifier of the VDisk.
- Copies
- Displays the number of VDisk copies. A value greater than one
indicates mirroring is enabled on this VDisk.
Actions
You
can select one of the following tasks from the task list:
Note: With the exception of the Create VDisks, Create
Image Mode VDisk, and Recover All VDisks tasks,
you must first select a VDisk before you can select a task. The Recover
VDisks and Recover All VDisks tasks
are available from the task list on this panel. You can also use the Recover
VDisks by I/O Groups task by selecting in the portfolio. On the Viewing I/O Groups panel,
select Recover VDisks by I/O Group from the
task list. Both the Recover All Corrupted VDisk and Recover
VDisks by I/O Group tasks allow you to recover multiple
corrupted VDisks.
- 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.