Enterprise Volume Manager (Multi-OS) Version 2.0D Network Administration Guide

Enterprise Volume Manager (Multi-OS) Network Administration Guide Glossary–5
Glossary
scheduler
An application that schedules and runs tasks. A typical scheduled task in the StorageWorks
environment is running an EVM job that replicates storage units for use in tape backups.
server
A computer or program that provides a service to other computers in a client-server system.
Servers often run continuously, waiting for requests from clients.
storage system
From the perspective of a host, each addressable StorageWorks array controller pair and their
attached physical disks.
snapclone
An EVM HSV job operation that creates a complete point-in-time (clone) copy of a specified
virtual disk (LUN). An HSV snapclone is a copy that begins as an HSV fully allocated
snapshot, but then becomes an independent virtual disk.
snapshot (virtual replication)
In StorageWorks, a nearly instantaneous controller-based method of creating a virtual copy of
a virtual disk. During creation, the original remains online and there is no interruption of
operations. The virtual copy consists of a bitmap stored in the array controller cache (not on
disk), and a temporary that holds data that have been overwritten since the snapshot was
created. Copies created by the snapshot method are typically used to conduct short-term tasks
such as backups.
TCP/IP
Transport Control Protocol/Internet Protocol. A suite of communications protocols used to
connect host computers to the Internet.
undo
A special job file that is automatically created by EVM for “undoing” steps that have been
completed in a user-created job. For example, the job named undo_stor1_backup_daily_sales
could be run after a tape backup was completed. The undo job would unmount the BCV units
and return their disks to the pool of free storage resources.
VCS
Virtual Controller Software. Provides storage controller software capability for the HSV-based
storage systems. Dual redundant HSV controllers are configured into the StorageWorks
Enterprise Virtual Array.