IBM 5786, Процедуры снятия и замены

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the failure occurs at system bring-up time, the host system might detect that the enclosure is missing,
and reports an error.
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the failure occurs at any time other than system bring-up time, the hourly health check reports the
failure.
Component and attention LEDs
This topic provides detailed information on the use of component and attention LEDs.
The component and attention LEDs assist in identifying failing components in your I/O enclosure. If a
failing component is detected in your enclosure, an amber colored LED on or near the failing component
is lit. Use the information in this topic along with the "Start of call" procedure, located in your host
system's service information, to isolate the failing component.
LEDs are either green or amber. The LEDS are typically located on the component.
Green LEDs indicate either of the following:
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Electrical power is present.
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Activity is occurring on a link. (The enclosure is either sending or receiving information.)
Amber LEDs indicate a fault or identify condition. If your enclosure or any of its components in your
enclosure has an amber LED turned on or blinking, identify the problem and then take the appropriate
action to restore the enclosure to its normal operating state.
The following definition list identifies, defines, and explains the on and off state of each LED. Following
the definition list are two illustrations that show the location of each LED.
Disk drive enclosure status LEDs
The two disk drive enclosure status LEDs indicate the following:
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Power good LED - (solid, not blinking) when lit this green colored LED indicates that the
disk-drive enclosure is receiving dc electrical power.
v Cage Fault LED - (solid, not blinking) when lit this amber colored LED indicates that one of
the components located in the disk-drive enclosure has failed.
Note:
– The failing component can be located either on the front or the rear of the subsystem.
– The disk-drive enclosure might be able to continue operating satisfactorily although the
failure of a particular part has been detected.
Disk drive LEDs
Up to twenty four disk drives can be installed into the front and back of the disk-drive enclosure
(twelve disk drives per side). Each disk drive contains three LEDs that are visible via light pipes.
The light pipes are attached to the disk-drive carrier and extend out the left side of each disk
drive.
v Disk drive activity LED (green) - The disk drive activity LED is controlled by the disk. For
most disk drives the green LED is lit when the disk is processing a command. However, for
some disk drives a different mode page setting allows the green LED to be lit when the disk
drive motor is spinning and the LED blinks toward an off state when a command is in
progress.
v
Disk drive fault LED (amber) - The disk fault LED is controlled by the SES processor on the
SCSI card. The disk drive fault LED can be viewed in one of the following three states:
– Off - This is the normal state for the disk-drive fault LED
– On - (solid, not blinking) indicates one of the following:
- A drive is to be removed
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Removal and replacement procedures