HP StorageWorks XP48 Disk Array - Manual (Page 61)

Working With OS-Based Constraints 61
4-3-6 Setting the Unit of Volume Management
In Provisioning Manager, the unit of volume management is an LU or a volume group. If you need to manage
volumes in smaller units, use an OS command or volume manager command to manually create, expand, or
delete a file system or device file.
There is a one-to-one correspondence between volume groups and volumes. The volume group is used only
for online expansion of a newly created volume. When adding a volume (LU) to a volume group, or deleting a
logical volume, make sure that you specify the volumes and physical partitions, and also specify the priority in
the order they are to be used. In this case, all the command options must be set to the default setting values.
4-3-7 Notes on Changing the Software Configuration
For a host for which a host-setting operation has not finished (that is, for a host for which a suspended
operation exists in the operation log), do not change any of the software listed below by installing or uninstalling
them, or by changing the software version.
• OS
• File system
• Program prerequisite for Provisioning Manager
• Program related to Provisioning Manager
For specific software names, see system requirements, prerequisite programs and related programs described
in the manual HP StorageWorks XP Provisioning Manager Installation and Configuration Guide.
If you change any of the above software for a host for which a host-setting operation has not finished, that host-
setting operation cannot be guaranteed when it resumes from the operation log. Before you change any
software, see the operation log and make sure that all host-setting operations have finished.
4-3-8 Notes on Changing a Host Name
When you change the host name of a host machine, match the host name of the host machine with the host
management information of Device Manager, and then use Provisioning Manager.
If you update host information when the host name of the host machine and host management information of
Device Manager do not match, both the host name that existed from before the change and the one created
after the change are displayed in the host management window. In such a case, you might be unable to use
Provisioning Manager correctly.
4-3-9 Improving Solaris™ Host Performance
Provisioning Manager uses the Solaris™ default settings for the settings except for the ones described in A.2
(2) Restrictions on creating a file system. When you want to improve host performance, manually adjust the
settings.
4-3-10 Using the Volume Manager RAID Functionality
You cannot configure RAID by using Provisioning Manager. Use either of the following methods to configure
RAID:
• Configure RAID by using the functionality of the storage subsystem.
• Configure such RAID software as stripe volume and mirror volume software by manually executing
commands such as the ones for the volume manager.
4-3-11 About Fragment and Data Compression (Saving Disk Space)
When creating many small size files (for example, files of several tens of kilobytes), reducing the fragment size
of the file system can save disk space but the duration of file system operations might increase.
The following value is specified by default as the file system fragment size:
• UFS: 1,024 bytes
• VERITAS™ File System: 1,024 bytes
When you want to create a file system with a fragment size different from the default, manually change the
setting for the fragment size, and then create the file system.
4-3-12 Using a Log and Specifying Log Size Using a File System
If you want to collect logs of the execution results when using VERITAS™ File System or UFS, manually mount
the file system by specifying the logging option, or perform the setup of the file system (/etc/vfstab).