A PDU that supplies power to the redundant AC power grid and the third and fourth accessory racks. See also N+1 and 2N+1.
Two PDUs for AC redundancy. Each PDU has extra DC power supplies for N+1 redundancy for each PDU.
Address Resolution Protocol (ARP)
A network layer protocol that converts IP address into physical addresses, like Ethernet addresses. Address Resolution Protocol (ARP) Takeover allows traffic to be redirected from a failing OSA-Express connection to another OSA-Express connection
Essentially a very large CAP, with all the characteristics of a CAP, such as online/offline state, ability to be shared by partitions, and so on. The cartridge slots in the AEM cannot be used for long-term cartridge storage.
A door on either side of the front facade through which service personnel can enter the library. Optional CAPs are attached to the right access door.
The number of storage slots the library is activated to use. This cannot exceed the installed capacity.
Automated Cartridge System Library Software (ACSLS)
An open systems software package that manages library contents and controls library hardware to mount and dismount cartridges on tape drives. This application also provides library management services such as cartridge tracking, pooling, reports, and library control.
Automated Cartridge System Library Software (ACSLS) High Availability (HA)
A hardware and software configuration that provides dual redundancy, automatic recovery, and automatic failover recovery to ensure uninterrupted library management for the SL3000.
An inventory of cartridge locations in all areas of the library, including the slots in the storage and reserved areas. Audits occur when:
The library initializes at power-on.
After either one or both access doors are opened and closed without activating the service safety door.
A physical audit request is made through SL Console.
Provides the entry level offering for an SL3000 library. Consists of a single frame and centralizes the infrastructure for all other modules in the library. This module includes the power supplies, robotic units, electronics control module, cartridge access port, storage slots, tape drives, and operator controls.
The storage capacity of the library. See also activated capacity and installed capacity.
A container holding magnetic tape that can be processed without separating the tape from the container. The library uses data, diagnostic, and cleaning cartridges.
A bi-directional port built into the door panel of the library which provides for the manual entry or automatic ejection of data or cleaning cartridges. Same as import/export mail slot in SCSI and open system libraries.
An optional module for the library that provides additional cartridge slot capacity and growth.
To remove and replace a system component (typically one such as a logic board that has no redundant backup) after system operations have been stopped and system power has been disabled.
Data set used by the ELS/HSC host software to control the functions of the automated library. Also called an ELS library database.
See dynamic WWN.
A partitioned section of the tape drive array assembly that holds one tape drive tray assembly.
A two-digit integer (01–64) that represents the physical locations into which drive tray assemblies are inserted.
Cells used to hold a cartridge if a robot failure occurs while a cartridge is in the robot hand.
Provides two separate host connections between the host software (ACSLS or HSC) and the library controller.
When enabled, dWWN assigns names to library drive slots rather than devices. When a drive is replaced, the new drive receives the same name as the one it replaced, thereby eliminating the need for system re-configuration. dWWN assigns names to individual tape drive slots rather than devices
See export.
A module that includes the HBK card, HBC/HBCR card and HBT card. The assembly that:
Processes commands from a host system
Coordinates the activities of robots and tape drives
Monitors status inputs from sensors and switches
(1) A safety scheme that allows a power down of a subsystem or a system as a whole instead of powering it down component-by-component.
(2) A safety switch on a system or in a data center that allows a user to immediately turn off a system or a data center power supply by cutting off the external source power.
See import.
Enterprise Library Software (ELS)
The software products that automate tape operations for mainframe users.
The action in which the library places a cartridge into the cartridge access port so that the operator can remove the cartridge from the library. Same as eject.
The act of moving to a secondary or redundant path when the primary path fails. Also, in ACSLS HA, failing over to the standby (alternate) ACSLS server.
A component of ELS, HSC is software that resides on mainframe operating systems and controls the library. The HSC receives requests from the programmatic interface and translates them into commands which are carried by the control path to the library. HSC is the overall manager of the library, the interface between a mainframe operating system and a library. HSC maintains a control data set, records of the cartridges stored in each library.
The process of updating the cartridge vol-ids and locations in a host CDS. This audit is initiated by a host command.
The process of placing a cartridge into the cartridge access port so that the library can insert it into a storage slot.
A switch that disconnects power to library mechanisms, excluding tape drives, when the front door is opened.
See logical unit number.
Software that provides content management for mainframe automated tape environments.
A set of tape data format standards created to enable data interchange among different LTO Ultrium tape drive vendors. These standards allow data cartridges to be shared.
A unique identifier for a physical storage allocation. A LUN could reference an entire RAID set, a single hard disk or partition, or multiple disks or partitions. Unlike a physical LUN, the virtual LUN does not map to a specific device or allocation of storage space but a virtualized space that can be created in excess of the actual physical space available.
A removable array that holds cartridges and is placed into the cartridge access port (CAP).
A power configuration that provides AC power and redundant DC power by adding a second DC power supply to each DC bus. See also 2N.
A cartridge in a partitioned library that is located in an unallocated slot or drive (that is, a slot or drive not allocated to any defined partition). Cartridges may become orphaned when partition boundaries are changed, partitions are deleted, or cartridges are manually moved to unallocated or inaccessible slots.
parking expansion module (PEM)
An additional module available for the SL3000 library that allows a redundant robot to be parked in it.
Physical audits occur when the robots:
Scan the cartridge locations in the library
Verify the volumes
Update the library control card inventory
Set the status of the cartridge location to true
A device for the distribution of AC line power from one inlet to multiple outlets. Multiple PDUs provide higher availability because the power continues if one PDU (or its alternating current source if the PDUs use separate AC sources) loses power.
primary library interface (PLI)
The communication path between the operator panel and the library controller.
(1) That portion of the upper robot track assembly that provides power and communication to the robot. (2) All of the cartridge slots and drives accessible through a rail.
A feature that provides failover protection in enterprise libraries. RE uses two sets of library controller cards. At any given time, one set is active and the other set is standby. The active library controller can failover to the standby in response to a command from ACSLS or the SL Console. Automatic failover can be initiated by the library if a library card fails.
A mechanism that moves horizontally along a track to transport tape cartridges to and from other locations in the library.
The process of moving a packet of data from a source to a destination. Routing enables messages to pass from one device to another device, and eventually reach their target.
A cryptographic protocol that provides communication security. The communication path between the PLI and the remote operator console occurs through SSL.
A container holding magnetic tape that can be processed without separating the tape from the container. The library uses data, diagnostic, and cleaning cartridges. These cartridges are not interchangeable.
An electromechanical device that moves magnetic tape and includes mechanisms for writing and reading data to and from the tape.
The mechanical structure that houses a tape drive, fan assembly, power and logic cards, cables, and connectors for data and logic cables. Same as drive tray assembly.
touch screen operator control panel
A flat-panel display with a touch screen interface and a panel mount computer. This feature is attached to the front of the library.
Volume ID assigned to a cartridge. Same as VOLSER.
Volume serial number. Same as vol-id.
Verified audits are invoked from SLC and validate the status of a specific cartridge slot or range of slots.
A 64-bit address that uniquely identifies each individual device and vendor, much like the MAC address of an Ethernet interface. Each port on a Fibre Channel network must have its own WWN. The WWN is not just a physical hardware address. It also serves as the logical address of a node on the SAN, meaning the SAN configuration changes if any of the attached hardware changes. If a device fails and is replaced, the WWN of the node changes, forcing reconfiguration of the SAN. There are three World wide Names reserved for each drive bay: Node, Port A, and Port B.