Chapter 8
Post-Installation Global Parameters Configurations
119
Configuring Logical Volumes
Also called a logical unit number (LUN), a logical volume is one or more disk drives
that are grouped together to form a single unit. Each logical volume is represented to
the host as a logical unit number. Using the
format
utility on the application host,
you can view the logical volumes presented by the array. You can use this disk space
as you would any physical disk—for example, to perform the following operations:
■
Install a file system
■
Use the device as a raw device (without any file system structure)
■
Partition the device
Note –
Individual physical disk drives are not visible from the application host.
Refer to the Sun StorEdge T3+ Array Administrator’s Manual for more information on
creating logical volumes.
Guidelines for Configuring Logical Volumes
Use the following guidelines when configuring logical volumes:
■
The array’s native volume management can support a maximum of two volumes
per array unit.
■
The minimum number of drives is based on the RAID level, as follows:
■
RAID 0 and RAID 1 require a minimum of two drives.
■
RAID 5 requires a minimum of three drives.
■
Drive number 9 can be designated as a hot spare. If designated, drive number 9
will be the hot spare for all volumes in the array.
■
A partial drive configuration is not allowed.
■
Volumes cannot span array units.
Consider the following questions when configuring logical volumes:
■
How many logical volumes do you need (one or two)?
■
What RAID level do you require?
■
Do you need a hot spare?
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