HDS HUS iSCSI driver

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System requirements
Supported operations
Configuration

This Block Storage volume driver provides iSCSI support for HUS (Hitachi Unified Storage) arrays such as, HUS-110, HUS-130, and HUS-150.

HDS iSCSI volume driver configuration options

These details apply to the XML format configuration file that is read by HDS volume driver. These differentiated service labels are predefined: svc_0, svc_1, svc_2, and svc_3^[4]. Each respective service label associates with these parameters and tags:

volume-types: A create_volume call with a certain volume type shall be matched up with this tag. default is special in that any service associated with this type is used to create volume when no other labels match. Other labels are case sensitive and should exactly match. If no configured volume_types match the incoming requested type, an error occurs in volume creation.
HDP, the pool ID associated with the service.
An iSCSI port dedicated to the service.

Typically a OpenStack Block Storage volume instance has only one such service label. For example, any svc_0, svc_1, svc_2, or svc_3 can be associated with it. But any mix of these service labels can be used in the same instance ^[5].

Table 1.6. Configuration options
Option	Type	Default	Description
`mgmt_ip0`	Required		Management Port 0 IP address
`mgmt_ip1`	Required		Management Port 1 IP address
`hus_cmd`	Optional		`hus_cmd` is the command used to communicate with the HUS array. If it is not set, the default value is hus-cmd.
`username`	Optional		Username is required only if secure mode is used
`password`	Optional		Password is required only if secure mode is used
`svc_0, svc_1, svc_2, svc_3`	Optional	(at least one label has to be defined)	Service labels: these four predefined names help four different sets of configuration options -- each can specify iSCSI port address, HDP and a unique volume type.
`snapshot`	Required		A service label which helps specify configuration for snapshots, such as, HDP.
`volume_type`	Required		`volume_type` tag is used to match volume type. `Default` meets any type of `volume_type`, or if it is not specified. Any other volume_type is selected if exactly matched during `create_volume`.
`iscsi_ip`	Required		iSCSI port IP address where volume attaches for this volume type.
`hdp`	Required		HDP, the pool number where volume, or snapshot should be created.
`lun_start`	Optional	0	LUN allocation starts at this number.
`lun_end`	Optional	4096	LUN allocation is up to, but not including, this number.

^[4]There is no relative precedence or weight among these four labels.

^[5]The get_volume_stats() always provides the available capacity based on the combined sum of all the HDPs that are used in these services labels.

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