IBM DS4500 Connecting a redundant drive loop to the DS4500

Connecting a redundant drive loop to the DS4500

Use the following procedure to connect a redundant drive loop to the DS4500 Storage Subsystem. You

will need two fiber-optic cables for each redundant pair of loops (for example, loop A and loop B) that

you are connecting to the DS4500 Storage Subsystem.

1. Connect drive loop A to the DS4500 Storage Subsystem, as shown in Figure 14 on page 14.

Starting with the last storage expansion enclosure in loop A, connect the In port on the left ESM

board to the Out (upper) port on drive mini hub 4 on the DS4500 Storage Subsystem.

Leave the Out port on the left ESM board on the first storage expansion enclosure and the In (lower)

connector on drive mini hub 4 unoccupied.

Loop B

Loop D

LoopA

Loop C

Storage expansion

enclosure group 1

Storage expansion

enclosure group 2

Storageserver

Figure 13. Connecting a second redundant storage expansion enclosure group (loops C and D)

Contents

Main IBM T otalStorage DS4500 Storage Subsystem Fibre Channel Cabling Guide Using IBM SFP modules and IBM fibre channel cables Installing an SFP module and fibre channel cable Figure 1. SFP modules and fibre channel cables o 90 cap 10 Direct-attached host-side fibre channel cabling DS4500 Storage Server 34 1 12 Host mini hubs Controller A Drive-side fibre-channel cabling Drive interface ports Figure 4. Drive mini-hub ports d3nu4024 OUTOUT mini-hub ports Overview: Cabling a DS4500 with four drive mini hubs Page In ds45cabx loop C Drive loop D Overview: Cabling a DS4500 with two drive mini hubs Out DS4500 Storage Server loop A Drive loop B Figure 6. Incorrect drive loop cabling in DS4500 configuration with four drive mini hubs installed Figure 7. Redundant drive loop cabling overview with two mini hubs in slots 4 and 2 ds452minb Drive minihub 4 Drive minihub 2 Drive Loop A Drive Loop B Drive Loop A Fibre Configuring the drive loops Drive Loop A Drive Loop B ds452min Drive Loop A Fibre Drive Loop B Fibre Figure 10. Storage expansion enclosure environmental services module (ESM) board in and out ports In In Storage expansion enclosure Last storage expansion ESM boards Figure 12. Connecting additional storage expansion enclosures to drive loops A and B Out Out In In In Out Figure 11. Connecting two storage expansion enclosures into redundant drive loop B Connecting a redundant drive loop to the DS4500 Loop B Storageserver enclosure group 2 Loop C Figure 15. Connecting redundant drive loops to the DS4500 Storage Subsystem d3nu4044b Out port on drive mini hub 4 Last storage expansion First storage expansion Page Trademarks GC26-7813-00 (1P) P/N: 39M6031