Silicon Graphics InfiniteStorage 4000 Series, Configuring And Maintaining

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62 Configuring a Storage Array with Volume Groups
Creating Volumes in
an Existing Disk Pool
If you want to add a new volume to an existing volume group, use this command:
create volume volumeGroup= volumeGroupNumber

userLabel= volumeName

[freeCapacityArea= freeCapacityIndexNumber |

capacity= volumeCapacity | owner=(a | b) |

cacheReadPrefetch=(TRUE | FALSE) |

segmentSize= segmentSizeValue ]
NOTE
Parameters wrapped in square brackets or curly brackets are optional. You can
use one or all of the optional parameters as needed to define your configuration. If you
choose not to use any of the optional parameters, the default values of the parameter
are provided for your configuration.
The
volumeGroup
parameter is the number of the volume group in which you want
to create a new volume. If you do not know the volume group numbers on the storage
array, you can use the
show allVolumes summary
command to get a list of the
volumes and the volume groups to which the volumes belong.
The
userLabel
parameter is the name that you want to give to the volume. The
volume name can be any combination of alphanumeric characters, hyphens, and
underscores. The maximum length of the volume name is 30 characters. You must
enclose the volume name with double quotation marks (“ ”).
The
freeCapacityArea
parameter defines the free capacity area to use for the
volume. If a volume group has several free capacity areas, you can use this parameter
to identify which free capacity area to use for volume creation. You do not have to
assign the entire capacity of the drives to the volume. Later, you can assign any
unused space to another volume.
The use of the
capacity
parameter, the
owner
parameter, the
cacheReadPrefetch
parameter, and the
segmentSize
parameter is the same
as described in the previous examples of the
create volume
command.
Tray Loss Protection
NOTE
Tray loss protection works only with volume groups.
The
trayLossProtect
parameter is a boolean switch that you set to turn on or
turn off tray loss protection. For tray loss protection to work, each drive in a volume
group must be on a separate tray. The way in which tray loss protection works
depends on the method that you choose to assign the drives for a volume group.
When you assign the drives, if you set
trayLossProtect
=
TRUE
and have
selected more than one drive from any one tray, the storage array returns an error. If
you set
trayLossProtect
=
FALSE
, the storage array performs operations, but the
volume group that you create does not have tray loss protection.