IBM DR550 - Manual (Page 10)

IBM System Storage DR550 Version 3.0 ------17 March 2006 Page 10
IBM Storage Systems Copyright © 2006 by International Business Machines Corporation
provide high performance and functionality. Events such as upgrades to support the latest version of
DS4000 Storage Manager can also often be executed without stopping operations.
IBM DS4100 Storage Server in the DR550 at a glance
Characteristics
Model 1724-100
RAID controller Dual active 2 GB RAID controllers
Cache 512 MB total, battery-backed
Host interface 4 - Fibre Channel (FC) Switched and FC Arbitrated Loop (FC-
AL) standard
Drive interface Redundant 2 Gbps FC-AL connections
EXP100 drives 400 GB 7200 RPM SATA disk drives
EXP100 enclosures 14 400 GB SATA disk drive modules, offering up to 5.6
Terabytes (TB) of physical capacity per enclosure
RAID Level 5 configured. RAID-10 can be configured at the
customer’s site using an optional IBM Services consultant
Maximum drives supported 112 Serial ATA drives (using 8 EXP100 Expansion Units) per
DS4100
Fans Dual redundant, hot-swappable
Management software IBM DS4000 Storage Manager version 9.12.65 (Special
version for exclusive use with DR550)
IBM TotalStorage SAN Switch
Two IBM TotalStorage SAN Fibre Channel Switches are used to interconnect both P5 520 servers
with the DS4100s to create a SAN (dual node configurations). Tape attachment such as the 3592,
TS1120 or LTO can be done using the additional ports on the switches. The switches (2005-B16)
build two independent SANs, which are designed to be fully redundant for high availability. This
implementation in the DR550 is designed to provide high performance, scalability, and high fault
tolerance.
For the single node configurations, only one switch (2005-B16) included. This creates a single
independent SAN and can be used for both disk and tape access.
The 2005-B16 is a 16-port, dual speed, auto-sensing fibre channel switch. Eight ports are
populated with 2 gigabit shortwave transceivers when the DR550 is configured for single copy
mode. Twelve ports are populated with 2 gigabit short wave tranceivers when the DR550 is
configured for enhanced remote volume mirroring. This dual implementation is designed to provide
a fault tolerant fabric topology, to help avoid single points of failure.
IBM SAN Fibre Channel Switch 2005-B16
Each switch in the DR550 comes pre-zoned by ports. Both switches are configured with distinct
zones as illustrated below:
Accessing the Switch(es)
If you need to access the switch(es) to review the zoning information, error messages, or other
information, you will need to connect Ethernet cables (provided by the customer) to the Ethernet port