Table of Contents
Advertisement
A 3494 B10 VTS with its four ESCON attachments supports up to 256 logical paths.
All virtual drives are addressable through any attachment interface.
The 3494 B20 VTS can be configured with up to 16 Extended Performance ESCON
Channel attachments. Each ESCON attachment supports 64 logical paths. A 3494
B20 VTS with its 16 ESCON attachments supports up to 1024 logical paths. All
virtual drives are addressable through any attachment interface.
FICON Host Attachment
The FICON channel attachment features provides attachment for 3494 B10 and B20
VTSs. The 3494 B10 or B20 VTS attaches to native FICON channels in systems such
as the IBM 9672 Enterprise G5 or G6 Servers and the zSeries
servers. Long and short wave attachments are provided and can be attached
directly to a server or through a director. FICON attachment is provided by FC
3415, Long Wave FICON Channel, and FC 3416, Short Wave FICON Channel.
FICON attachment features provide increased performance for VTS configurations,
greater simplicity of configuration, and increased per channel bandwidth. They
also extend the allowable server to VTS attachment distance up to 100 km.
If your level of microcode is greater than 2.28.700, your VTSs and PtP VTSs can be
attached to 1 Gbps or 2 Gbps FICON channels. The VTS and VTC microcode will
auto-negotiate with the channel and select the correct speed. If you want to
override the auto-negotiation and force the subsystem to run at 1 Gbps speed,
please contact an IBM service representative. An example of when this would be
required is if you are using a 2 Gbps channel with a cable length that is only
supported for 1 Gbps.
SCSI Host Attachment
The SCSI Host Attachment feature provides attachment to RS/6000, pSeries,
Hewlett-Packard, Intel
S/390
requires assignment of virtual drive usagesimilar to stand alone tape drives.
Because only one host system at a time can use a drive, the drive has to be
dedicated to that host during processing.
For a detailed discussion on tape library sharing between S/390 or zSeries and
SCSI hosts, including considerations about drive sharing, volume sharing, and
related software implementation steps, see the Guide to Sharing and Partitioning IBM
Tape Library Dataservers. The SCSI target addresses are discussed in the IBM
TotalStorage 3494 Tape Library Introduction and Planning Guide.
PtP VTS
The PtP VTS is a configuration of multiple 3494 B10 or B20 VTSs with their
associated tape libraries and multiple 3494 AX0 VTCs or VTCs. The 3494 AX0
VTCs or VTCs are installed in one, two, three, or four 3494 CX0 Frames or 3494
CX1 Frames. The 3494 CX0 Frame or 3494 CX1 Frame contains no other
equipment.
The 3494 B10 or B20 VTSs, the 3494 AX0 VTCs or VTCs, and their interconnections
provide a single PtP VTS that the host system treats as a single VTS. The PtP VTS
configuration provides a dual copy of data in newly created or updated tape
volumes automatically. The PtP VTS stores a copy of the tape volume data in the
78
3494 Tape Library Operator Guide
®
, Sun, and Windows
®
, zSeries, RS/6000, pSeries, Sun, Hewlett-Packard, and Windows servers
®
800, 900, or 990
®
servers. The sharing of a VTS among
Advertisement
Table of Contents
