IBM E16RMLL-I Implementation Guide - Page 783
Java Virtual Machine JVM™
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Host Any system that has at least one Internet address associated with it. A host with multiple network interfaces can have multiple Internet addresses associated with it. This is also referred to as a server. Host bus adapter (HBA) A Fibre Channel HBA connection that allows a workstation to attach to the SAN network. Hub A Fibre Channel device that connects up to 126 nodes into a logical loop. All connected nodes share the bandwidth of this one logical loop. Hubs automatically recognize an active node and insert the node into the loop. A node that fails or is powered off is automatically removed from the loop. IP Internet protocol. J Java A programming language that enables application developers to create object-oriented programs that are very secure, portable across different machine and operating system platforms, and dynamic enough to allow expandability. Java runtime environment (JRE™) The underlying, invisible system on your computer that runs applets the browser passes to it. Java Virtual Machine (JVM™) The execution environment within which Java programs run. The Java virtual machine is described by the Java Machine Specification, which is published by Sun Microsystems. Because the Tivoli Kernel Services is based on Java, nearly all ORB and component functions execute in a Java virtual machine. JBOD Just a Bunch Of Disks. JRE See Java runtime environment. JVM See Java Virtual Machine. L Logical unit number (LUN) The LUNs are provided by the storage devices attached to the SAN. This number provides you with a volume identifier that is unique among all storage servers. The LUN is synonymous with a physical disk drive or a SCSI device. For disk subsystems such as the IBM Enterprise Storage Server, a LUN is a logical disk drive. This is a unit of storage on the SAN that is available for assignment or unassignment to a host server. Loop topology In a loop topology, the available bandwidth is shared with all the nodes connected to the loop. If a node fails or is not powered on, the loop is out of operation. This can be corrected using a hub. A hub opens the loop when a new node is connected and closes it when a node disconnects. See also Fibre Channel Arbitrated Loop and arbitrated loop. LUN See logical unit number. LUN assignment criteria The combination of a set of LUN types, a minimum size, and a maximum size used for selecting a LUN for automatic assignment. LUN masking This allows or blocks access to the storage devices on the SAN. Intelligent disk subsystems like the IBM Enterprise Storage Server provide this kind of masking. M Managed object A managed resource. Glossary 753