User Guide

3-2 Preliminary Draft Ampex 1308904-X4
Model No.
Running Head
ACL Configuration ACL Application Programmer’s Guide
3.3 ACL Configuration
The following paragraphs describe the ACL configuration.
3.3.1 Addressable Elements
Each ACL element that can contain a tape cartridge is assigned both a SCSI address and a
location name. The libacl API functions use the SCSI address to refer to an element. The ACL
utilities use the location name.
2XX and 4XX ACLs can move a tape cartridge from a storage bin to the tape drive, or from
the tape drive to a storage bin. 8XX ACLs can move a tape cartridge to or from any element.
Element SCSI Addresses
libacl functions recognize the SCSI element addresses listed below. You can use the
aclGetElemData() function to retrieve complete element counts and SCSI starting addresses
from the ACL.
Series 2XX and 4XX
Series 8XX
Data Transfer
Element
The ACL tape drive. Its SCSI address is 100d (64h).
Transport
Element
The ACL cartridge handling system (CHS) which consists of the
mechanical and electrical assemblies necessary to transfer tape cartridges
between the storage bins and the tape drive. Its SCSI address is 01.
Storage
Element
One of the seven storage bins in the CHS. The bins are assigned SCSI
addresses 1000d / 3E8h (bottom bin) through 1006d / 3EEh ( top bin).
Data Transfer
Element
The ACL tape drive(s). Up to four tape drives can be installed in the ACL.
The drives are assigned SCSI addresses 100d / 64h (bottom drive) through
103d / 67h (top drive).
Transport
Element
The ACL cartridge handling system (CHS) which consists of the
mechanical and electrical assemblies necessary to transfer tape cartridges
between the storage bins, import/export bins, and tape drive(s). Its SCSI
address is 01.