Internet Small Computer System Interface qualified name Internet storage name service Inter-switch link hop Input/output group I/O throttling rate iSCSI initiator iSCSI session iSCSI target Latency Least recently used Licensed capacity Internet Small Computer System Interface (iSCSI) qualified name (IQN) refers to special  names that identify both iSCSI initiators and targets. IQN is one of the three name formats  that is provided by iSCSI. The IQN format is  iqn.< yyyy - mm> .< reversed domain name > . For  example, the default for an SVC node can be in the following format: iqn.1986-03.com.ibm:2145.< clustername >.< nodename > The Internet Storage Name Service (iSNS) protocol that is used by a host system to manage  iSCSI targets and the automated iSCSI discovery, management, and configuration of iSCSI  and FC devices. It was defined in Request for Comments (RFC) 4171. An inter-switch link (ISL) is a connection between two switches and counted as one ISL hop.  The number of hops is always counted on the shortest route between two N-ports (device  connections). In an SVC environment, the number of ISL hops is counted on the shortest  route between the pair of nodes that are farthest apart. The SVC supports a maximum of  three ISL hops. A collection of volumes and node relationships that present a common interface to host  systems. Each pair of nodes is known as an I/O group. The maximum rate at which an I/O transaction is accepted for a volume. An initiator functions as an iSCSI client. An initiator typically serves the same purpose to a  computer as a SCSI bus adapter would, except that, instead of physically cabling SCSI  devices (like hard drives and tape changers), an iSCSI initiator sends SCSI commands over  an IP network.  The interaction (conversation) between an iSCSI Initiator and an iSCSI Target.  An iSCSI target is a storage resource located on an iSCSI server. The time interval between the initiation of a send operation by a source task and the  completion of the matching receive operation by the target task. More generally, latency is the  time between a task initiating data transfer and the time that transfer is recognized as  complete at the data destination. Least recently used (LRU) pertains to an algorithm used to identify and make available the  cache space that contains the data that was least recently used. The amount of capacity on a storage system that a user is entitled to configure. Appendix C. Terminology  805