HP StorageWorks XP Remote Web Console Software - Manual (Page 13)

LUN Configuration and Security Manager XP user guide for the XP128/XP1024 13
1 LUN Manager for the XP128/XP1024
You can connect XP arrays to open system and mainframe hosts using iSCSI (Internet Small Computer
System Interface), Fibre Channel, and Network Attached Storage (NAS). Use LUN Manager to configure
host groups, logical units (LUs), and Fibre Channel and NAS ports. You can also configure NAS cache
settings.
LU configuration overview
One of the important tasks in logical unit (LU) configuration is to define I/O paths from hosts to LUs. After
the paths are defined, the hosts can send commands and data to the LUs and can receive data from them.
LUN Manager can also configure security policies to protect LUs from unauthorized access.
Fibre Channel environment
In a Fibre Channel environment, you must configure the Fibre Channel ports on the disk array. With LUN
Manager, you can set addresses and speed, and specify topology for Fibre Channel ports.
iSCSI environment
In an iSCSI environment, the XP disk array provides mutual user authentication between hosts and ports by
using Challenge Handshake Authentication Protocol (CHAP).
NAS environment
There are two types of LUs in a NAS environment:
• System LUs
• User LUs
When configuring a NAS system, you must define paths between hosts and user LUs. You cannot define
paths to system LUs, and you cannot define any LU paths to external volumes.
Supported emulation types
LUN Manager supports the following device emulation types:
• OPEN-3, OPEN-9, OPEN-8 (XP128/XP1024 only), OPEN-E, OPEN-L, and OPEN-V for open systems
• 3390-3A/B/C and 3380-KA/B/C for mainframe systems
LU paths
After hosts and the disk array are physically connected by cables, switches, and so on, use LUN Manager
to establish paths between the hosts and LUs. These paths are called LU paths and they determine which
host can access which LU.
• Up to 256 LU paths can be defined for a host group in a Fibre Channel or iSCSI environment
• Up to 512 LU paths can be defined for a Fibre Channel port for the XP128/XP1024 arrays
• Up to 256 LU paths can be defined for a NAS port
• Up to 128 host groups can be defined for a Fibre Channel port for the XP128/XP1024 arrays
• In an iSCSI environment, you can define:
• Up to 16 initiators per port
• Up to 16 host groups per port
• Up to 16 initiators per host group
NOTE: In an iSCSI environment, the number of initiators per host group multiplied by the number
of host groups must be less than or equal to 16.
• Up to 65,536 host groups can be defined for one disk array (256 x 256)