This scenario describes how to modify fixed block storage
within a storage image.
Before you begin
To modify fixed block volume groups, you must have the command-line interface prompt, and
you must be connected to a storage system that will be used for open systems host system
storage.
About this task
Adding volumes to a volume group and removing volumes from a volume group are typical
storage management tasks. The volumes in a volume group can be unassigned
from a volume
group. Volumes that are assigned to a volume group can be moved to a different volume group. In
either case, you are responsible for managing how the volumes are allocated to volume groups and how
the volumes are reserved for future allocation. It is better that you maintain unassigned
volumes in a volume group that is not accessible by any host system, controlling the accessibility
of volumes that are reserved for future allocation.You can assign a fixed block volume to
multiple volume groups. This action is necessary for some host system applications. However, damage
to volume data can occur if a volume is accessed by different host systems using different file
management systems. To assign a fixed block volume to multiple volume groups, complete the following
steps:
Procedure
- Find the fixed block volumes that are to be assigned to
a volume group using the following command.
dscli>
lsfbvol -dev ID -datatype 512 | 520p | 520u
-extpool ID
The command creates a list of all volumes of the specified
volume type within the specified extent pool. It includes only the
volumes that are contained by the specified storage image.
- Retrieve the current volume group volume map using the
following command.
dscli>
showvolgrp -dev ID volume_group_ID
The command creates a list of volumes that are
assigned to the target volume group.
- Modify the volume group using the following command.
dscli>
chvolgrp -dev ID -action add | remove | replace -volume
ID,ID,...,ID volume_group_ID
To add or remove volumes, you can add or remove
volume IDs to the list. This command applies the updated volume ID
list.