IBM System Storage DS4000, Руководство по оборудованию

Страница: 535 / 566

Appendix B. Deploying iSCSI host interface controllers on the IBM System Storage DS5000 series
517
The first section, the type, is the “IQN” string, which indicates that this is an iSCSI qualified
name. A period delineates the next field, which is a date code. This date corresponds to the
next field, which is a reversed domain name. The date should be the point in time at which the
domain name was registered.
Figure B-2 Example of an IQN name in a defined host
The combination of the domain name and date indicate that the name is based on a
registered authority. A colon separates the first three fields (the qualification) from the unique
string that identifies the device. Many initiators and targets allow you to alter the iSCSI target
name, although you cannot alter iSCSI target names in the IBM DS5000 platform. Note that
even though iSCSI is in use, the underlying communication protocol is still TCP/IP, so you still
need to assign valid IP addresses, along with normal associated IP configuration parameters
to all of the appropriate iSCSI initiator and target ports. IQNs are used with iSCSI to allow for
name translation services in the event that an underlying IP address were to change for a
given initiator or target, for example, using Dynamic Host Control Protocol (DHCP).
After a session has been established between the target and the initiator, you can continue
storage provisioning and usage in a manner similar to that of an FC-based storage
subsystem.
iSCSI physical components
After planning the DS5000 as iSCSI target storage subsystem, there are several other
components that you use to configure an iSCSI SAN. Of particular interest is the connectivity
point for the iSCSI communications within the physical host server itself. You can use several
different options to allow iSCSI network traffic to interface with the underlying server
hardware. These eventually connect to the operating system and application by using
hardware-accelerated host bus adapters (HBAs) and software initiators.