Chapter 1. Introduction to IBM Open Systems Tape 21
In the future, the imbedded SMI-S should have the same functions as the external LINUX PC.
The Advanced Library Management System (ALMS), an optional extension to the IBM
patented multi-path architecture (FC1690), provides enhanced flexibility and capabilities for
partitioning the IBM TS3500 Tape Library. ALMS virtualizes the SCSI element addresses
while maintaining the approach of the multi-path architecture and using SCSI Medium
Changer commands. Without ALMS, everything is based on the SCSI element address
(location-centric) and partitioning is based on real cartridge slots and drive slots. With ALMS,
there is no affinity between a real slot address and a SCSI Element address reported to the
server and used by the server. Instead there is now an affinity with the VOLSER (volume
serial numbers on the barcode label of the cartridge). For further information and examples of
using ALMS, see 2.3, “Partitioning the TS3500 with ALMS enabled” on page 60.
1.1.16 Virtual I/O
The IBM TS3500 Tape Library has I/O stations and I/O slots that enable you to import and
export up to 32 cartridges at any given time. The I/O slots are also known as
. As a feature of ALMS, Virtual I/O (VIO) slots increase the quantity of
available I/O slots by allowing storage slots to appear to the host as I/O slots. Storage slots
that appear to the host as I/O slots are called
virtual import/export elements (VIEEs). The
goal of virtual I/O slots is to reduce the dependencies between the system administrator and
library operator so that each performs their import and export tasks without requiring the
other to perform any actions. With virtual I/O slots, the library automatically moves cartridges
from the I/O stations to physical storage slots and from physical storage slots to the I/O
stations. For further description of Virtual I/O, refer to 2.3.2, “Virtual I/O” on page 65.
1.1.17 Element number
Element numbers identify the physical location within the library. This information is required
mostly for storage applications, such as IBM Tivoli Storage Manager, which translate the
device to a name that the robotic system understands.
In the IBM TS3500 Tape Library, each SCSI storage element is assigned a SCSI element
address. A SCSI storage element is a physical location capable of holding a tape cartridge
(such as an I/O slot, drive, or storage slot). The element numbering is grouped in:
Tape drive sequence
I/O station sequence
Cartridge slot sequence
Note: The imbedded SMI-S function requires an Lx3 Frame and a library firmware level
that supports SMI-S.
Note ALMS is available only for the IBM TS3500 Tape Library and requires FC1690 for
Note: The numbering is contiguous for the cartridge slot sequence. However, the addition,
removal, or movement of one or more tape drives can affect the element numbering of the