Nortel Networks BCM1000 manual Connecting RAID board ribbon cables

192Chapter 16 Replacing the hard disk

In the mirrored disk configuration, the RAID controller board automatically writes the same data from the primary hard disk to the secondary/mirrored disk. Once this is complete, the board ensures that the disks remain identical. With this configuration, if one disk fails, the second disk has an exact copy of the current information and the system continues to function. This minimizes recovery time after disk failure.

Note: Backup and restore data

Remember to continue to do data backups that get stored off-site, as part of your recovery strategy.

Connecting RAID board ribbon cables

The RAID board has three labelled ribbon connectors, which connect to the following:

•Host connects to the IDE 1 connector on the control board (motherboard)

•Mirrored connects to the secondary (mirroring) hard disk

•Primary connects to the primary hard disk

Danger: The RAID board connectors are NOT hot-swappable. Ensure that the system is powered down before you attempt to connect or disconnect any of the cables.

Figure 98 shows the location of these connectors on the RAID board.

Figure 98 RAID Board

Mirrored disk cable connector

Power connector

Host (Motherboard cable

connector)

Face of board with LEDs

Primary disk cable connector

Warning: Reconnecting Mirrored and Primary cables

After maintenance, the Mirrored and Primary cables must always be attached to the same hard disk positions from which they were removed.

This means that if the Primary disk fails, the Primary cable gets connected to the new blank disk. Mirroring then occurs from the Mirrored disk to the blank Primary disk. Once mirroring has completed, the Mirroring disk hands over control to the new Primary disk.

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