HP StorageWorks Clustered File System 3.2.1 Windows Storage Server Edition Administration Guide (February 2006)

Chapter 7: Configure Dynamic Volumes 53
• Striped dynamic volumes can be extended up to 16 times; however,
the total number of subdevices cannot exceed 128.
Guidelines for Creating Dynamic Volumes
When creating striped dynamic volumes, follow these guidelines:
• The subdevices used for a striped dynamic volume should be the
same size. The CFS Volume Manager uses the same amount of space
on each subdevice in the stripeset. When a striped dynamic volume is
created, the CFS Volume Manager determines the size of the smallest
specified subdevice and then uses only that amount of space on each
subdevice. If the subdevices are different sizes, the additional space on
the larger subdevices will be wasted.
This limitation also applies when a striped dynamic volume is
extended. The newly added subdevices constitute a new stripeset. The
size of the smallest subdevice determines the amount of space that
will be used on each of the subdevices.
• The default stripe size should be adequate for most applications and
hardware configurations. However, be sure to check your application
documentation for recommendations regarding the stripe size. Also
consider the requirements and performance of the underlying storage
hardware.
Create a Dynamic Volume
When you create a dynamic volume, you will need to select the
subdevices to be included in the volume. If the volume will be striped,
you will also need to select a stripe size. Optionally, HP Clustered File
System can also create a filesystem that will be placed on the dynamic
volume.
To create a dynamic volume from the HP CFS Management Console,
select Storage > Dynamic Volume > Create Volume or click the Volume
icon on the toolbar.