Installation and User's Guide

files are deleted from aggregate files, so itmight be less than the physicaloccupancy.logical unit (LU)An access point through which a user orapplication program accesses the SystemsNetwork Architecture (SNA) network tocommunicate with another user orapplication program.logical unit number (LUN)In the Small Computer System Interface(SCSI) standard, a unique identifier that isused to differentiate devices, each ofwhich is a logical unit (LU).logical volumeA portion of a physical volume thatcontains a file system.logical volume backupA back up of a file system or logicalvolume as a single object.Logical Volume Snapshot Agent (LVSA)Software that can act as the snapshotprovider for creating a snapshot of alogical volume during an online imagebackup.loopback virtual file system (LOFS)A file system that is created by mountinga directory over another local directory,also known as mount-over-mount. ALOFS can also be generated using anautomounter.LU See logical unit.LUN See logical unit number.LVSA See Logical Volume Snapshot Agent.Mmacro fileA file that contains one or more storagemanager administrative commands,which can be run only from anadministrative client using the MACROcommand. Contrast with Tivoli StorageManager command script.mailbox restoreA function that restores MicrosoftExchange Server data (from IBM DataProtection for Exchange backups) at themailbox level or mailbox-item level.managed objectIn Tivoli Storage Manager, a definition inthe database of a managed server thatwas distributed to the managed server bya configuration manager. When amanaged server subscribes to a profile, allobjects that are associated with thatprofile become managed objects in thedatabase of the managed server. Ingeneral, a managed object cannot bemodified locally on the managed server.Objects can include policy, schedules,client option sets, server scripts,administrator registrations, and serverand server group definitions.managed serverA Tivoli Storage Manager server thatreceives configuration information from aconfiguration manager using asubscription to one or more profiles.Configuration information can includedefinitions of objects such as policy andschedules. See also configuration manager,subscription, and profile.management classA policy object that users can bind to eachfile to specify how the server manages thefile. The management class can contain abackup copy group, an archive copygroup, and space management attributes.See also copy group, space manager client,bind, and rebind.maximum transmission unitThe largest possible unit of data that canbe sent on a given physical medium in asingle frame. For example, the maximumtransmission unit for Ethernet is 1500bytes.MB See megabyte.megabyte (MB)(1) 1 048 576 bytes (two to the twentiethpower) when used in this publication.(2) For processor storage, real and virtualstorage, and channel volume, 2 to thepower of 20 or 1 048 576 bits. For diskstorage capacity and communicationsvolume, 1 000 000 bits.metadataData that describes the characteristics ofdata; descriptive data.migrateTo move data from one storage location toanother. In Tivoli Storage Managerproducts, migrating can mean movingGlossary 683