Plan for your external storage system configurations through
iSCSI connections with Lenovo Storage V series clustered systems.
See the following websites for the most recent support information:
Use the following guidelines to configure iSCSI-attached storage to
the system:
- Unlike Fibre Channel connections, you need to manually configure
the connections between the source system and the target external
storage systems.
- Discovery of the target IPs and session establishment is manually
configured either I/O group-wide (nodes from a specified I/O group
discover and establish sessions) or system-wide (all nodes discover
and establish sessions).
- After
successful discovery, initiator sessions must be established from
the source system to target storage system manually through nodes
in a specific I/O group or all nodes across the system.
- A
one-to-one mapping of source ports to target ports is required. The
same numbered ports on each source system or node connect to only
one port on each target system or node. Multiple initiator ports on
the same system node cannot connect to the same target port (many-to-one
connectivity). Similarly one initiator port cannot be connected to
multiple target ports on same target storage system (one-to-many connectivity).
The CLI command fails if such an attempt is made.
- Zoning is not required.
- A HyperSwap® topology system is supported in iSCSI connections.
- Direct attachment between the system and external storage systems
is not supported and requires Ethernet switches between the system
and the external storage.
- To avoid a single point of failure, a dual switch configuration
is recommended. For full redundancy, a minimum of two paths between
each initiator node and target node must be configured with each path
going through a separate switch.
- Extra paths can be configured to increase throughput if both initiator
and target nodes support more ports.