Storage Views multipath calculation
search cancel

Storage Views multipath calculation

book

Article ID: 344619

calendar_today

Updated On:

Products

VMware vCenter Server VMware vSphere ESXi

Issue/Introduction

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.

Symptoms:


Environment

VMware ESXi 4.1.x Installable
VMware vSphere ESXi 5.5
VMware vCenter Server 4.1.x
VMware ESXi 4.1.x Embedded
VMware ESX 4.0.x
VMware ESX 4.1.x
VMware vSphere ESXi 5.1
VMware vCenter Server 5.1.x
VMware ESXi 3.5.x Embedded
VMware vCenter Server 5.5.x
VMware vSphere ESXi 5.0
VMware vCenter Server 5.0.x
VMware vCenter Server 4.0.x
VMware ESXi 4.0.x Embedded
VMware ESX Server 3.5.x
VMware ESXi 3.5.x Installable
VMware ESXi 4.0.x Installable

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).


Additional 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

Powered by Wolken Software