IBM DR550 manual Characteristics, Accessing the Switches

IBM System Storage DR550 Version 3.0 ------ 17 March 2006 Page 10

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

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