Veritas Storage Foundation Intelligent Storage Provisioning 5.0.1 Solutions Guide, HP-UX 11i v3, First Edition, November 2009

# vxassist -g mydg -P mypool make strpvol 2g \

capability=’DataMirroring,MirrorsOnSeparateComponents’

Such a volume tolerates the failure of one enclosure and provides greater

reliability. This volume could also be created by specifying traditional vxassist

storage specification parameters:

# vxassist -g mydg -P mypool make strpvol 2g layout=mirror \

nmir=2 mirror=enclosure

However, it is not possible to use the old-style vxassist specification attributes

to replicate all of ISP’s advanced allocation features. For example, the capabilities

that specify the creation of a volume mirrored across enclosures can be combined

with a multipathing capability to provide resilience against the failure of one of

the paths to an enclosure:

# vxassist -g mydg -P mypool make strpvol 2g \

capability=’DataMirroring,MirrorsOnSeparateComponents,\

MultipathingThroughMultiplePaths’

If no storage can be allocated that fulfills the requested capability, the command

fails.

Using hardware mirroring with volumes

ISP allows you to create a striped volume from LUNs that are mirrored in the

array hardware. The inbuilt rules also ensure that this redundancy is retained

when the volume is grown or shrunk. The following example demonstrates how

to create a 10-gigabyte striped-mirror volume with 8 columns using prefabricated

mirrors to form each column:

# vxassist -g mydg -P mypool make strpvol 2g \

capability=’Striping(ncols=8),PrefabricatedDataMirroring’

Using storage attribute tags with volumes

A storage attribute allows the properties of a LUN to be defined in an arbitrary

conceptual space. For example, attributes can describe properties such as:

■ Disk access name

■ Disk media name

■ Manufacturer

■ Model type

Volume creation solutions

Using storage attribute tags with volumes