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7-3

Working With Single-level Containers

Specifying Freespace When Creating a Volume Set

A volume set’s size is created from freespace. To specify freespace

when creating a volume set, use the container create volume

command. There must be enough freespace available on your disk

or disks to create a container of the desired size. See Understanding

Freespace in Chapter 6, Working with Container Attributes, for

information on freespace.

Note that you can use the container extend volume command

at a later time to increase the size of your volume set. See Chapter 9,

Modifying Containers, for a description of the container extend

volume command.

In the following example, the container create volume

command creates a volume set on SCSI device (2,1,0) using 100MB

(megabytes) of freespace.

HPN0> container create volume ((2,1,0), 100M)

Executing: container create volume ((CHANNEL=2,ID=1,LUN=0),

104,857,600)

Container 0 created

Enabling a Volume Set’s Raw Container Cache

The controller provides two global cache buffer pools available to

containers: a volatile read-ahead cache and a non volatile NVRAM

write-back cache. Collectively, these global caches are referred to as

the raw container cache.

The container create volume command provides a /cache

switch that allows you to enable the container’s raw cache.

In the following example, the container create volume

command with the /cache switch creates a volume set with the raw

container cache enabled.

HPN0> container create volume /cache=TRUE ((2,1,0), 100M)

Executing: container create volume /cache=TRUE

((CHANNEL=2,ID=1,LUN=0), 104,857,600)

Container 0 created

If you use the /cache switch, the controller:

■ Enables the read-ahead cache setting for the specified volume

set.

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