Use this page to select one or more volume groups for the
resource group. You also can configure Network file system (NFS) mounts
and exports to be available for use by the resource group.
A shared volume group is a volume group that is located 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. Network File System (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 Network File
System (NFS) exports
- Select one or more volume groups from the list that you want to
define as part of the resource group. You can deselect the file systems
and NFS exported file systems on the volume group that is to be available
when the resource group goes online.
- Version of Network File System exports
- Select the Network File System (NFS) export protocol that you
want to use for all NFS file systems included in the resource group.
You can select the protocol based on the number of nodes in the resource
group. The default selection is NFS V2/3 for
the export protocol if the resource group has two or fewer nodes.
If the resource group has more than two nodes, you can select only NFS
V4 for the export protocol. The protocol you select is
used to export all the 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 the available file systems that are
managed by the resource group and that are accessible to all the nodes
in the resource group. Alternatively, 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 property. NFS V4 requires a stable storage
location to save state information. This state information is used
for recovery after a fallover.
- NFS mounts
- Specify the file systems or 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 file system is /mnt/fs1, enter /nfsmount/share1;/mnt/fs1.
All
nodes in the resource chain attempt to mount these network 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 mount the network 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 attempts
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. It also is made when 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 File Systems 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 select which file systems and which NFS export file systems to
include as part of the resource group. The window lists all file systems
that are accessible to all the nodes in the resource group. By default,
all file systems are selected to be included in the resource group. Consequently,
you must clear 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 with only one node at a time, and only if
you also selected the associated file system. If you select any NFS
export file systems, you also must provide additional configuration information
for the Volume Groups page.