HP OpenVMS System Manager's Manual, Volume 1:... |
Managing Storage Media |
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File system expansion consists of the following steps:
These steps are discussed in the following sections.
Reserving
Additional Bitmap Space ![]()
To
expand your file system dynamically, you must first perform a one-time
allocation of additional bitmap space. To do this, you allocate
space to the maximum size that can ever be used on a volume; OpenVMS imposes
an upper limit of 1TB.
You can perform the one-time allocation of additional bitmap space at either of the following times:
$ INITIALIZE /LIMIT $1$DGAnnn !Allocates 1TB bitmap space$ SET VOLUME /LIMIT $1$DGAnnn !Allocates 1TB bitmap spaceOnce allocated, the volume can be expanded while the disk is mounted as shareable (MOUNT /SHARE).
Notes about using these commands:
Enlarging Storage Containers ![]()
You
can enlarge storage containers in either of the following ways:
Using Additional
INITIALIZE Qualifiers for Dynamic Volume Expansion ![]()
For better performance, you might want to create a file system
that is smaller than the current physical size of the volume. If
you have a 36 Gb disk, but you anticipate adding an 18 Gb disk in
the future, you might initialize the disk with the INITIALIZE /LIMIT
command and then enter the following command to reserve 18 Gb of
bitmap space:
$ INITIALIZE /SIZE=18000000 $1$DGAnnnThis
command initializes the disk at 18 Gb of file system space. You
can expand the file system later, if the need arises.To increase the expansion limit on volumes already in use, plan to increase the expansion limit during the next convenient maintainance period using the SET VOLUME /LIMIT command.
When you use the /LIMIT qualifier with the INITIALIZE or SET VOLUME command, you increase the BITMAP.SYS file by a few hundred blocks, which gives you much greater flexibility in the future. You can later expand the volume (using the SET VOLUME /SIZE command) quickly if your storage requirements increase unexpectedly.
Increasing
the Expansion Limit of Volumes in a Cluster ![]()
To
increase the expansion limit of volumes in a cluster, do the following:
The following example shows how to increase the expansion limit of a volume mounted in a cluster:
$ DISMOUNT /CLUSTER /NOUNLOAD $252$DUA716:$ MOUNT $252$DUA716: TST716$ SET VOLUME /LIMIT $252$DUA716:$ DISMOUNT /NOUNLOAD $252$DUA716:$ MOUNT /CLUSTER $252$DUA716: TST716
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