HP NetRAID-4M Controller - Manual (Page 153)

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.