In the ESXi context, the term target identifies a single storage unit that a host can access. The terms device and LUN describe a logical volume that represents storage space on a target. The terms device and LUN mean a SCSI volume presented to the host from a storage target.
Different storage vendors present their storage systems to ESXi hosts in different ways. Some vendors present a single target with multiple LUNs on it. Other vendors, especially iSCSI vendors, present multiple targets with one LUN each.
In Target and LUN Representations, three LUNs are available in each configuration. On the left, the host sees one target, but that target has three LUNs that can be used. Each LUN represents an individual storage volume. On the right, the host sees three different targets, each having one LUN.
Use esxcli storage core to display information about available LUNs on ESXi 5.0. For ESX/ESXi 4.x hosts, use vicfg-scsidevs. For ESX/ESXi 3.5 systems, the corresponding command is vicfg-vmhbadevs.
You can run one of the following commands to examine LUNs. Specify one of the connection options listed in Connection Options in place of <conn_options>.
The command lists device information for all logical devices on this system. The information includes the name (UUID), device type, display name, and multipathing plugin. Specify the - -device option to only list information about a specific device.
The command lists the primary UID for each device (naa.xxx or other primary name) and any other UIDs for each UID (VML name). You can specify - -device to only list information for a specific device.
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Print mappings for VMFS volumes to the corresponding partition, path to that partition, VMFS UUID, extent number, and volume names.
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Use vicfg-scsidevs to display information about available LUNs on ESX/ESXi 4.x hosts. For ESX/ESXi 3.5 systems, the corresponding command is vicfg-vmhbadevs.
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Important You can run vicfg-scsidevs - -query and vicfg-scsidevs - -vmfs against ESX/ESXi version 3.5. The other options are supported only against ESX/ESXi version 4.0 and later.
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You can run one of the following commands to examine LUNs. Specify one of the connection options listed in Connection Options in place of <conn_options>.
The command lists device information for all logical devices on this system. The information includes the name (UUID), device type, display name, and multipathing plugin. Specify the - -device option to only list information about a specific device. The following example shows output for two devices; the actual listing might include multiple devices and the precise format differs between releases.
The command lists the primary UID for each device (naa.xxx or other primary name) and any other UIDs for each UID (VML name). You can specify - -device to only list information for a specific device.
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Print mappings for VMFS volumes to the corresponding partition, path to that partition, VMFS uuid, extent number, and volume names.
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