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Technical white paper | HP Enterprise Virtual Array Storage and VMware vSphere 4.x and 5.x configuration best practices

When a path failure occurs, the NMP communicates with the SATP and PSP and then takes the appropriate action. For

example, the NMP would update its list of available paths and communicate with the PSP to determine how I/O should be

re-routed based on the specified path selection policy.

Displaying the SATP list

Although there is no way to monitor the NPM’s list of available paths through vCenter, you are able to display a list of

available SATPs and their respective default PSPs (as shown in Table 5).

Use the following CLI command on the ESX console:

esxcli nmp satp list/grep EVA

Note

Currently, you cannot reconfigure the SATP rules table through vCenter.

Table 5. vSphere 4.x and 5.x SATP rules table, with entries that are relevant to EVA arrays denoted by an asterisk

SATP

Default PSP

Description

VMW_SATP_ALUA_CX

VMW_PSP_FIXED

Supports EMC CLARiiON CX arrays that use ALUA

VMW_SATP_SVC

VMW_PSP_FIXED

Supports IBM SAN Volume Controller (SVC) appliances

VMW_SATP_MSA

VMW_PSP_MRU

Supports HP Modular Smart Array (MSA) arrays

VMW_SATP_EQL

VMW_PSP_FIXED

Supports EqualLogic arrays

VMW_SATP_INV

VMW_PSP_FIXED

Supports the EMC Invista application

VMW_SATP_SYMM

VMW_PSP_FIXED

Supports EMC Symmetrix arrays

VMW_SATP_LSI

VMW_PSP_MRU

Supports LSI and other arrays compatible with the SIS 6.10 in non-AVT

mode

VMW_SATP_EVA*

VMW_PSP_FIXED

Supports HP EVA arrays

VMW_SATP_DEFAULT_AP*

VMW_PSP_MRU

Supports non-specific active/passive arrays

VMW_SATP_CX

VMW_PSP_MRU

Supports EMC CLARiiON CX arrays that do not use ALUA protocol

VMW_SATP_ALUA*

VMW_PSP_MRU

Supports non-specific arrays that use the ALUA protocol

VMW_SATP_DEFAULT_AA

VMW_PSP_FIXED

Supports non-specific active/active arrays

VMW_SATP_LOCAL

VMW_PSP_FIXED

Supports direct-attached devices

IMPORTANT

SATPs are global, whereas a PSP can either be global or set on a per-Vdisk basis. Thus, a particular array can only use a

specific SATP; however, Vdisks on this array may be using multiple PSPs – for example, one Vdisk can be set to round robin

I/O path policy, while another Vdisk on the same array is set to MRU.

As indicated in Table 5, the following SATPs are relevant to EVA arrays:

• VMW_SATP_DEFAULT_AP – This SATP is used by active/passive EVA arrays. However, since such arrays are not supported

in vSphere 4.x and 5.x, you should not use this plug-in to enable a vSphere 4.x and 5.x connection to an active/passive

EVA for production purposes.

• VMW_SATP_EVA – This SATP is intended for active/active EVA arrays that have the Target Port Group Support (ALUA

compliance) option turned off; however, all such arrays have TPGS turned on by default. Since this option is not user-

configurable, no current EVA arrays use VMW_SATP_EVA.

• VMW_SATP_ALUA – This SATP is intended for any ALUA-compliant array; thus, it is used with active-active EVA arrays.

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