Use this page to define and configure one or more shared
volume groups and configure NFS mounts and exports to be available
for use by the resource group.
A shared volume group is a volume group that resides entirely on
the external disks that are shared by the cluster nodes associated
with the resource group. A file system is written to a single logical
volume. NFS is a distributed file system for computer networks that
is independent of operating system, type of system, and network architecture.
Fields
- Choose volume groups, file systems, and NFS exports
- Select one or more volume groups from the list that you want to
define as part of the resource group. You can then select the file
systems and NFS exported file systems on that volume group that you
want to be available when the resource group goes online.
- Edit Filesystems and NFS exports
- After selecting a volume group, click this link in the File
Systems column of the table to open the Choose
file systems and NFS exports window. In this window you
can choose which file systems and which NFS export file systems to
include as part of the resource group. All file systems that are accessible
to all the nodes in the resource group are listed. By default, all
file systems are selected to be included in the resource group. Consequently,
you must deselect any file systems that you do not want to make available
to the resource group when the resource group goes online.
You
must explicitly select any NFS export file systems that you want to
be available to the resource group when it is goes online. NFS export
file systems are available for selection only if the resource group
is online at only one node at a time and only if the associated file
system is also selected. If you select any NFS export file systems,
you also must provide additional configuration information on the Volume
Groups page.
- NFS version for exports
- Select the NFS export protocol that you want to use for all NFS
file systems included in the resource group. Which protocol you can
select depends on how many nodes are in the resource group. The default
selection is NFS V2/3 for the export protocol
if the resource group has 2 or fewer nodes. If the resource group
has more than two nodes, you can select only NFS V4 for
the export protocol. Whichever protocol you select, it is the only
protocol that is used to export any and all NFS file systems included
in the resource group. If you select NFS V4, you must also specify
the Stable storage path.
- Stable storage path (NFS V4)
- Select a file system from a list of those available file systems
that are managed by the resource group and accessible to all the nodes
in the resource group. Alternately, you can specify a file system
manually; however, the file system that you specify cannot be an NFS
exported file system. You must specify a file system to use as the
stable storage path when you select NFS V4 as the NFS version
for exports, which requires a stable storage location
to save state information. This state information is used on recovery
after a fallover.
- NFS mounts
- Specify a list of all file systems / directories managed by the
resource group that you want to allow all nodes in the resource chain
to attempt to mount. Use the syntax NFS_Mount_Point;Local_Filesystem,
where NFS_Mount_Point is the location where
the NFS file system is to be mounted and Local_Filesystem is
the file system to export. For example, if the NFS_Mount_Point is /nfsmount/share1 and
the Local_Filesystem is /mnt/fs1, enter /nfsmount/share1;/mnt/fs1.
All
nodes in the resource chain will attempt to NFS mount these file systems
or directories while the owner node is active in the cluster. This
optional configuration provides uniform access to the underlying file
systems on all the nodes of the resource group.
- Preferred network for NFS mounts
- Select the preferred network to NFS-mount the file systems. This
information is required only when you specify file systems for the NFS
mounts field.
- Use forced varyon
- Selecting Yes for this option specifies
that PowerHA™ SystemMirror
is to attempt a forced vary on operation for all volume groups in
the resource group. This attempt is made in the event that a normal
vary on operation for the volume group fails due to a lack of quorum,
and if PowerHA SystemMirror
finds at least one complete copy of every logical volume for this
volume group. This option is only meaningful for volume groups in
which every logical volume is mirrored. The default selection for
this option is No.
Actions
- Edit filesystems an NFS Exports
- After selecting a volume group, click this link in the File
Systems column of the table to open the Choose
file systems and NFS exports window. In this window you
can choose which file systems and which NFS export file systems to
include as part of the resource group.