Use the Viewing VDisks Dependent on Controllers panel in
the SAN Volume Controller Console to
display the list of virtual disks (VDisks) that will go offline if
the selected controllers are taken offline. If a single storage system
appears as multiple controller objects on SAN Volume Controller Console,
or if you want to take multiple systems offline, select multiple controllers
to view the dependent VDisks.
Introduction
If
you are taking a disk controller offline, you can perform one of the
following actions to remove the dependencies on the listed
VDisks:
- Select Migrate a VDisk from the task list. You can use this to
move the VDisk to an MDisk that does not use the selected disk controller.
- Select Add Mirrored VDisk Copy from the task list and wait for
the VDisk copies to synchronize. If the VDisk is already mirrored
to another controller, check the synchronization progress of the VDisk
copies.
- Ensure that quorum disks are not on the selected controller. VDisk
are dependent if quorum disks exist on the selected controller.
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.
- 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.
- 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 if 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 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 following
values are possible:
- 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 Mirror or Global
Mirror mappings that this VDisk belongs to.
- UID
- Displays the unit identifier of the VDisk.
- Copies
- Displays the number of VDisk copies.
Actions
You
can select one of the following tasks from the task list:
Note: With the exception of the Create VDisks and Create
Image Mode VDisk tasks, you must first select a VDisk
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.
- Close
- Click this button to exit the panel.