IBM 704 manual Hard Disk Drive Status Indicators, Indicator State Description Light

Removing Internal Drives

Note: Before you hot-swap a drive, make sure it is defective. If you partially or completely remove a good drive instead of a defective one, your server might lose valuable data.

This situation is especially relevant if you have a RAID adapter installed and you assigned RAID level 1 or 5 to the logical drives in your disk array. However, the RAID adapter can rebuild the data that you need, provided that certain conditions are met. Refer to the RAID adapter documentation for further details.

Table 6 describes the lights that indicate the status of the hard disk drives in the server.

Table 6. Hard Disk Drive Status Indicators

Indicator	State	Description
Light
Hard Disk	Continuously	Hot-swap drive is present. Power
Power-On	on (green)	is being applied to the drive.
Hard Disk	Flashing	Hot-swap drive activity is
In-Use	(green)	occurring. Data is being read
		from or written to the drive.
		Power is being applied to the
		drive.
Hard Disk	Continuously	Hot-swap drive has a fault. The
Fault	on (amber)	indicator light stays on until the
		RAID adapter clears it.
Hard Disk	Flashing	Rebuild is in process. Do not
Fault	(amber)	remove the drive.

Note: When the indicator light indicates a drive fault, you can replace a hot-swap drive without turning off the server.

Chapter 4. Installing Options 189