Use the Deleting Node panel in the SAN Volume Controller Console to
remove a node from a cluster.
Introduction
Before
deleting a node from the cluster, record the node serial number, worldwide
node name (WWNN), all worldwide port names (WWPNs), and the I/O group
that the node is currently part of. Recording this node information
can avoid data corruption if the node is re-added to the cluster at
a later time. Confirm that the node that you have selected is
the one to delete.
Before
a node is deleted the
SAN Volume Controller checks
to determine if there are any virtual disks (VDisks) that depend on
that node. If the node that you selected contains VDisks within the
following situations, VDisks go offline and become unavailable if
the node is deleted:
- The node contains solid-state drives (SSD) and also contains the
only synchronized copy of a mirrored VDisk
- The other node in the I/O group is offline
If you select a node to delete that has these dependencies, another
panel displays confirming the deletion. To delete the node in this
case, click
Force Delete message panel that
displays.
Note: If you choose to force the deletion of the node as
a result of an error about VDisks going offline, you force the node
removal and run the risk of losing data from the write cache.
Attributes
The
following attributes are displayed in the table:
- Name
- Displays the name that is assigned to this node. If you have not
yet assigned a name, a default name is assigned. The default name
is the string node followed by the system-assigned
ID. You can click the link in this column to display detailed information
about the node.
- State
- Displays the current state of the node. The following values are
possible:
- Adding
- Indicates that the node has been added to the cluster but is not
synchronized with the state of the cluster.
- Deleting
- Indicates that the cluster is in the process of deleting the node.
Any VDisk-to-host mappings and Copy Services interactions are being
deleted.
- Flushing
- Indicates that the node is clearing its cache.
- Online
- Indicates that the node is operational, assigned to a cluster,
and has access to the fibre-channel storage area network (SAN) fabric.
- Offline
- Indicates that the node is not operational. The node has been
assigned to a cluster but is not available on the fibre-channel SAN
fabric. Run the directed maintenance procedures to determine the problem.
- WWNN
- Displays the worldwide node name of the node.
- I/O Group Name
- Displays the name of the I/O group that this node belongs to.
The default name is the string io_grp followed by
the system-assigned ID.
- Configuration Node
- Indicates if this node is the configuration node for the cluster.
The following values are possible:
Actions
The
following actions are available:
- OK
- Click this button to delete this node.
- Force Delete
- Click this button to force the deletion of the selected node.
Note: This
option displays when the selected node contains solid-state drives (SSDs) that
have dependant virtual disks (VDisks). An error message displays the
VDisks that go off line and become unavailable if the node is deleted.
- Cancel
- Click this button to exit this panel without deleting the node.