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51. Incorrect cabling for an intermix of EXP100, EXP710, and EXP810 storage expansion enclosure
(example 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .72
52. Correct cabling to EXP810 port 1B . . . . . . . . . . . . . . . . . . . . . . . .73
53. Incorrect cabling to the EXP810 port . . . . . . . . . . . . . . . . . . . . . . .74
54. Incorrect cabling to the EXP500/EXP100/EXP700/EXP710 ports . . . . . . . . . . . . .75
55. Redundant drive loop cabling overview . . . . . . . . . . . . . . . . . . . . . . .77
56. Redundant drive loop cabling overview with two drive mini hubs in slots 4 and 2 . . . . . . .78
57. Redundant drive loop cabling overview with two drive mini hubs in slots 1 and 2 - Not for use
unless you meet the requirements in the Note above . . . . . . . . . . . . . . . .79
58. Redundant drive loop cabling overview — four drive mini hubs . . . . . . . . . . . . . .80
59. Connecting two EXP500, EXP100, EXP700, or EXP710 storage expansion enclosures into drive
loop A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .82
60. EXP500, EXP100, EXP700, or EXP710 storage expansion enclosure ESM board In and Out ports 82
61. Connecting two EXP500, EXP100, EXP700, or EXP710 storage expansion enclosures into
redundant drive loop B . . . . . . . . . . . . . . . . . . . . . . . . . . . . .83
62. Connecting additional EXP500, EXP100, EXP700, or EXP710 storage expansion enclosures to
drive loops A and B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .84
63. Connecting a second redundant EXP500, EXP100, EXP700, or EXP710 storage expansion
enclosure group (loops C and D) . . . . . . . . . . . . . . . . . . . . . . . . .85
64. Connecting EXP500, EXP100, EXP700, or EXP710 drive loop A to the DS4500 . . . . . . .86
65. Connecting redundant EXP500, EXP100, EXP700, or EXP710 drive loops to the DS4500 . . . .87
66. Connecting two redundant EXP500, EXP100, EXP700, or EXP710 storage expansion enclosure
groups . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .89
67. Connecting two EXP810 storage expansion enclosures into drive loop A . . . . . . . . . .90
68. EXP810 storage expansion enclosure ESM board ports 1A and 1B . . . . . . . . . . . .91
69. Connecting two EXP810 storage expansion enclosures into redundant drive loop B . . . . . .91
70. Connecting additional EXP810 storage expansion enclosures to drive loops A and B . . . . . .92
71. Connecting a second redundant EXP810 storage expansion enclosure group (loops C and D) 93
72. Connecting EXP810 drive loop A to the DS4500 . . . . . . . . . . . . . . . . . . .94
73. Connecting redundant EXP810 drive loops to the DS4500 . . . . . . . . . . . . . . .95
74. Connecting two redundant EXP810 storage expansion enclosure groups . . . . . . . . . .97
75. Example 1: One DS4500 and two or more storage expansion enclosures in a mixed environment
— Recommended cabling . . . . . . . . . . . . . . . . . . . . . . . . . . .99
76. Example 2: One DS4500 and two or more storage expansion enclosures in a mixed environment
— Recommended cabling . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
77. Host-agent (in-band) managed storage subsystems . . . . . . . . . . . . . . . . . 105
78. Direct (out-of-band) managed storage subsystems . . . . . . . . . . . . . . . . . . 106
79. Connecting hosts directly to the controller . . . . . . . . . . . . . . . . . . . . . 107
80. Using two fibre channel switches to connect a host . . . . . . . . . . . . . . . . . . 108
81. Using four fibre channel switches to connect multiple hosts . . . . . . . . . . . . . . . 108
82. Adding hosts by using cascading switches . . . . . . . . . . . . . . . . . . . . . 109
83. Host adapters in storage subsystems on a fibre channel network . . . . . . . . . . . . .110
84. Connecting the power cords . . . . . . . . . . . . . . . . . . . . . . . . . .112
85. Redundant AC power connections to controllers and storage expansion enclosures . . . . . .113
86. Mini hub Link Rate Interface switch and Speed LED . . . . . . . . . . . . . . . . .114
87. DS4500 Storage Subsystem alarm switch . . . . . . . . . . . . . . . . . . . . . 121
88. DS4500 Storage Subsystem front LEDs . . . . . . . . . . . . . . . . . . . . . . 127
89. Controller LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
90. Battery unit LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
91. Fan and communications module LED . . . . . . . . . . . . . . . . . . . . . . 132
92. Fan and communications module LED . . . . . . . . . . . . . . . . . . . . . . 133
93. Mini hub LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134
94. Fan and communications and power supply fault LEDs . . . . . . . . . . . . . . . . 140
95. Storage subsystem fan LED . . . . . . . . . . . . . . . . . . . . . . . . . . 140
96. Checking the battery service date . . . . . . . . . . . . . . . . . . . . . . . . 141
97. Location of Cache Active (Fast Write Cache) . . . . . . . . . . . . . . . . . . . . 142
viii IBM TotalStorage DS4500 Fibre Channel Storage Subsystem: Installation, User’s, and Maintenance Guide