IBM SAN Volume Controller 2145-CG8 Hardware Maintenance Manual page 116

v If you are replacing a hot-swap drive, you do not have to turn off the node, and you can leave the
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| service-controller cable attached to the service controller.
To remove the service controller, perform the following steps:
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| 1. Read the safety information to which "Preparing to remove and replace parts" on page 26 refers.
| 2. If you are intending to replace the service controller field-replaceable unit (FRU), use one of the
following methods to read and record the WWNN of the node.
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v From the front panel, press the down button until Node: xxxx shows in the display. Press the right
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| button until Node WWNN: nnnnn is displayed and record the five-digit number.
| v From the cluster vital product data (VPD), record the last five digits of the WWNN or the WWPN
of the Fibre Channel ports.
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If you cannot obtain the WWNN with either method, obtain the information from your
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| storage-attached network (SAN) switch.
| 3. If you are intending to replace the service controller FRU, verify that the node data is mirrored and
synchronized, and that there are no dependent virtual disks before turning off the node.
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Follow the procedure in MAP 5350 in the IBM System Storage SAN Volume Controller Troubleshooting
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| Guide to verify that the node data is mirrored and synchronized, and that there are no dependent
volumes before turning off the node.
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4. Optional: Slide the node out on its slide rails to the fully extended position.
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You can leave the Fibre Channel and Ethernet cables connected, if you are using the
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| cable-management arm and if you are not removing the node from the rack. If the location of the
node in the rack is too high or too low to work comfortably, you can remove the node from the rack.
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| Fast path: You can perform this service procedure with the node in place.
5. If you must remove the node from the rack to work on it, perform the following procedure to turn
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off the node, remove all cables, and remove the node from the rack:
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| a. If you have not yet done so, verify that the node data is mirrored and synchronized, and that
there are no dependent virtual disks before turning off the node.
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Follow the procedure in MAP 5350 in the IBM System Storage SAN Volume Controller
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Troubleshooting Guide to verify that the node data is mirrored and synchronized, and that there are
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| no dependent volumes before turning off the node.
b. Pull back the cable-management arm if you are working from the rear of the rack, or slide the
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node out of the rack to the fully extended rail position if you are working from the front.
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| c. When the node is completely turned off, remove the cable-retention brackets and disconnect the
| power cables, as described in "Removing the cable-retention bracket" on page 34.
d. To make sure that you can replace all cables in the same ports from which they were removed,
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label the port position of each Fibre Channel and Ethernet cable; then remove all cables from the
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| back of the node.
e. Remove the node from the rack and place it on a flat, static-protective surface. See "Removing
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the SAN Volume Controller from a rack" on page 46.
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6. Locate the recessed, blue service-controller release buttons on each side of the controller. See
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| Figure 73 on page 87.
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IBM SAN Volume Controller Hardware Maintenance Guide