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Knowledge Base

Storage Views multipath calculation (1017634)

Last Updated: 10/21/2015Categories: InformationalTotal Views: 8502Language:
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Purpose

This article provides information on how Multipathing Status calculation works on the Storage Views tab and also explains why the Multipathing Status shows the status Partial/No Redundancy.

Resolution

Multipathing Status calculation for a host-LUN combination from all paths between the two

If there exists 2 or more distinct adapters AND 2 or more distinct targets

MPStatus = Up (Full Redundancy)

else If there exists at least one path whose status is "Up"

MPStatus = degraded (Partial/No Redundancy)

else If there exists at least one path whose status is "Unknown"

MPStatus = unknown (Unknown)

else (for all other cases)

MPStatus = down (All Paths Down)

Note:

MPStatus is the Multipathing Status

Software iSCSI has one adapter, which is bound to the VMkernel interfaces, and the esxcfg-mpath -l command shows 2 paths. You will always see Partial Redundancy status based on the way Multipathing Status displayed in vCenter is calculated. The same applies for NFS (and for any SAS controllers, if installed).

Related Information

You can show LUN status and many more details about your storage devices using the esxcfg-scsidevs -l command.

Output example:

# esxcfg-scsidevs -l

mpx.vmhba0:C0:T0:L0

Device Type: CD-ROM

Size: 326 MB

Display Name: Local TSSTcorp CD-ROM (mpx.vmhba0:C0:T0:L0)

Multipath Plugin: NMP

Console Device: /vmfs/devices/cdrom/mpx.vmhba0:C0:T0:L0

Devfs Path: /vmfs/devices/cdrom/mpx.vmhba0:C0:T0:L0

Vendor: TSSTcorp Model: DVD-ROM TS-L333A Revis: D100

SCSI Level: 5 Is Pseudo: false Status: on

Is RDM Capable: false Is Removable: true

Is Local: true Is SSD: false

Other Names:

vml.0005000000766d686261303a303a30

VAAI Status: unsupported

naa.600508e00000000028b234352eb6130b

Device Type: Direct-Access

Size: 138752 MB

Display Name: Dell Serial Attached SCSI Disk (naa.600508e00000000028b234352eb6130b)

Multipath Plugin: NMP

Console Device: /vmfs/devices/disks/naa.600508e00000000028b234352eb6130b

Devfs Path: /vmfs/devices/disks/naa.600508e00000000028b234352eb6130b

Vendor: Dell Model: VIRTUAL DISK Revis: 1028

SCSI Level: 5 Is Pseudo: false Status: degraded

Is RDM Capable: true Is Removable: false

Is Local: false Is SSD: false

Other Names:

vml.0200000000600508e00000000028b234352eb6130b564952545541

VAAI Status: unknown

naa.600508e000000000ee0f6fe4e84c580a

Device Type: Direct-Access

Size: 277504 MB

Display Name: Dell Serial Attached SCSI Disk (naa.600508e000000000ee0f6fe4e84c580a)

Multipath Plugin: NMP

Console Device: /vmfs/devices/disks/naa.600508e000000000ee0f6fe4e84c580a

Devfs Path: /vmfs/devices/disks/naa.600508e000000000ee0f6fe4e84c580a

Vendor: Dell Model: VIRTUAL DISK Revis: 1028

SCSI Level: 5 Is Pseudo: false Status: degraded

Is RDM Capable: true Is Removable: false

Is Local: false Is SSD: false

Other Names:

vml.0200000000600508e000000000ee0f6fe4e84c580a564952545541

VAAI Status: unknown

For more information about the esxcfg-scsidevs -l command, see Identifying disks when working with VMware ESXi/ESX (1014953).

Identifying disks when working with VMware ESXi/ESX

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