vSphere Storage - ESXi 5.1 - Documentation - VMware

vSphere Storage
n While VMW_PSP_MRU is typically selected for ALUA arrays by default, certain ALUA storage arrays
need to use VMW_PSP_FIXED. To check whether your storage array requires VMW_PSP_FIXED, see the
VMware Compatibility Guide or contact your storage vendor. When using VMW_PSP_FIXED with ALUA
arrays, unless you explicitly specify a preferred path, the ESXi host selects the most optimal working path
and designates it as the default preferred path. If the host selected path becomes unavailable, the host
selects an alternative available path. However, if you explicitly designate the preferred path, it will remain
preferred no matter what its status is.
n By default, the PSA claim rule 101 masks Dell array pseudo devices. Do not delete this rule, unless you
want to unmask these devices.
List Multipathing Claim Rules for the Host
Use the esxcli command to list available multipathing claim rules.
Claim rules indicate which multipathing plug-in, the NMP or any third-party MPP, manages a given physical
path. Each claim rule identifies a set of paths based on the following parameters:
n Vendor/model strings
n Transportation, such as SATA, IDE, Fibre Channel, and so on
n Adapter, target, or LUN location
n Device driver, for example, Mega-RAID
In the procedure, --server=server_name specifies the target server. The specified target server prompts you
for a user name and password. Other connection options, such as a configuration file or session file, are
supported. For a list of connection options, see Getting Started with vSphere Command-Line Interfaces.
Prerequisites
Install vCLI or deploy the vSphere Management Assistant (vMA) virtual machine. See Getting Started with
vSphere Command-Line Interfaces. For troubleshooting , run esxcli commands in the ESXi Shell.
Procedure
u Run the esxcli --server=server_name storage core claimrule list --claimrule-class=MP command
to list the multipathing claim rules.
Example: Sample Output of the esxcli storage core claimrule list Command
Rule Class Rule Class Type Plugin Matches
MP 0 runtime transport NMP transport=usb
MP 1 runtime transport NMP transport=sata
MP 2 runtime transport NMP transport=ide
MP 3 runtime transport NMP transport=block
MP 4 runtime transport NMP transport=unknown
MP 101 runtime vendor MASK_PATH vendor=DELL model=Universal Xport
MP 101 file vendor MASK_PATH vendor=DELL model=Universal Xport
MP 200 runtime vendor MPP_1 vendor=NewVend model=*
MP 200 file vendor MPP_1 vendor=NewVend model=*
MP 201 runtime location MPP_2 adapter=vmhba41 channel=* target=* lun=*
MP 201 file location MPP_2 adapter=vmhba41 channel=* target=* lun=*
MP 202 runtime driver MPP_3 driver=megaraid
MP 202 file driver MPP_3 driver=megaraid
MP 65535 runtime vendor NMP vendor=* model=*
206 VMware, Inc.