Acopia Networks 810-0044-00 Manual de instalación descargar pdf (Pagina 239)

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101

Adding a Managed Volume

Selecting a VPU (optional)

CLI Storage-Management Guide 9-45

Selecting a VPU (optional)

The next step in configuring a volume is to choose its Virtual-Processing Unit (VPU).

A VPU is a virtual CPU that can fail over from one chassis to another in a redundant

configuration. Every volume type, including managed and direct, runs on a particular

VPU. The namespace software chooses a default VPU if you do not explicitly choose

one.

VPUs, maximum volumes per platform, maximum namespaces per platform, and the

algorithm for default-VPU assignment were discussed in the chapter about direct

volumes; recall “Selecting a VPU (optional)” on page 8-19.

Assigning the Volume to a VPU

As you would in a direct volume, use the vpu command to assign the volume to a

VPU. Do this before the volume is enabled; once the volume is enabled (below), you

cannot re-assign it to another VPU without entirely rebuilding it.

For example, the following command sequence assigns the current volume,

“medarcv~/rcrds,” to VPU 2:

bstnA6k(gbl)# namespace medarcv

bstnA6k(gbl-ns[medarcv])# volume /rcrds

bstnA6k(gbl-ns-vol[medarcv~/rcrds])# vpu 2

bstnA6k(gbl-ns-vol[medarcv~/rcrds])# ...

The default-VPU assignment rules can artificially reduce the maximum number of

namespaces for the host switch. Once the volume is enabled, its VPU assignment is

permanent. This is a much bigger problem for managed volumes than it is for direct

volumes. Read about VPUs carefully before using the default-VPU assignment.

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