Qlogic Fibre Channel HBA and VM Informacje Techniczne Pobierz pdf (Strona 24)

Handles I/O queueing to the physical storage HBAs.

Handles physical path discovery and removal.

Provides logical device and physical path I/O statistics.

As Figure 2-3 illustrates, multiple third-party MPPs can run in parallel with the VMware NMP. The third-party

MPPs can replace the behavior of the NMP and take complete control of the path failover and the load-

balancing operations for specified storage devices.

Figure 2-3. Pluggable Storage Architecture

third-party

MPP

third-party

MPP

VMkernel

pluggable storage architecture

VMware NMP

VMware SATP VMware PSP

VMware SATP

third-party SATP third-party PSP

The multipathing modules perform the following operations:

Manage physical path claiming and unclaiming.

Manage creation, registration, and deregistration of logical devices.

Associate physical paths with logical devices.

Process I/O requests to logical devices:

Select an optimal physical path for the request.

Depending on a storage device, perform specific actions necessary to handle path failures and I/O

command retries.

Support management tasks, such as abort or reset of logical devices.

VMware Multipathing Module

By default, ESX/ESXi provides an extensible multipathing module called the Native Multipathing Plugin

(NMP).

Generally, the VMware NMP supports all storage arrays listed on the VMware storage HCL and provides a

default path selection algorithm based on the array type. The NMP associates a set of physical paths with a

specific storage device, or LUN. The specific details of handling path failover for a given storage array are

delegated to a Storage Array Type Plugin (SATP). The specific details for determining which physical path is

used to issue an I/O request to a storage device are handled by a Path Selection Plugin (PSP). SATPs and PSPs

are sub-plugins within the NMP module.

VMware SATPs

Storage Array Type Plugins (SATPs) run in conjunction with the VMware NMP and are responsible for array-

specific operations.

ESX/ESXi offers an SATP for every type of array that VMware supports. These SATPs include an active/active

SATP and active/passive SATP for non-specified storage arrays, and the local SATP for direct-attached storage.

Each SATP accommodates special characteristics of a certain class of storage arrays and can perform the array-

specific operations required to detect path state and to activate an inactive path. As a result, the NMP module

can work with multiple storage arrays without having to be aware of the storage device specifics.

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