Continuous Data Availability; Connectivity - Hitachi 9900 User And Reference Manual

Extensive connectivity and resource sharing:
Concurrent operation of UNIX
–
NetWare
Fibre-channel, Fiber Connection (FICON™), and Extended Serial Adapter™ (ESCON
–
server connections.
– Optimized for storage-area networks (SANs), fibre-channel switched, fibre-channel
arbitrated loop, and point-to-point configurations.
1.1.1

Continuous Data Availability

The Hitachi Lightning 9900™ is designed for nonstop operation and continuous access to all
user data. To achieve nonstop customer operation, the 9900 subsystem accommodates
online feature upgrades and online software and hardware maintenance. See section 1.2 for
further information on the reliability and availability features of the Lightning 9900™
subsystem.
1.1.2

Connectivity

The Hitachi Lightning 9900™ RAID subsystem supports concurrent attachment to S/390
mainframe hosts and open-system (UNIX
subsystem can be configured with FICON™ ports, Extended Serial Adapter™ (ExSA™) ports
(compatible with ESCON
all-open, and multiplatform configurations.
When FICON™ channel interfaces are used, the 9900 subsystem can provide up to 16 logical
control unit (CU) images and 4096 logical device (LDEV) addresses. Each physical FICON™
channel interface supports up to 512 logical paths providing a maximum of 8192 logical paths
per subsystem. FICON™ connection provides transfer rates of up to 100 MB/sec (1Gbps).
When ExSA™ channel interfaces are used, the 9900 subsystem can provide up to 16 logical
control unit (CU) images and 4,096 logical device (LDEV) addresses. Each physical ExSA™
channel interface supports up to 256 logical paths providing a maximum of 8,192 logical
paths per subsystem. ExSA™ connection provides transfer rates of up to 17 MB/sec.
When fibre-channel interfaces are used, the 9900 subsystem can provide up to 32 ports for
attachment to UNIX
determines the number of logical units (LUs) that may be connected to each port. Fibre-
channel connection provides data transfer rates of up to 200 MB/sec (2 Gbps). The 9900
subsystem supports fibre-channel arbitrated loop (FC-AL) and fabric fibre-channel topologies
as well as high-availability (HA) fibre-channel configurations using hubs and switches.
2 Chapter 1 Overview of the Lightning 9900™ Subsystem
®
-based, Windows NT
® ®
, and S/390 host systems.
®
protocol), and/or fibre-channel ports to support all-mainframe,
®
-based and/or PC-server platforms. The type of host platform
®
, Windows
®
-based and/or PC-server) platforms. The 9900
® ®
2000, Linux ,
®
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