### Indicator lights and problem indications

### This chapter contains the following sections:

### · Enclosure LEDs

### · Controller LEDs

### · Power supply LEDs

### · Hard disk drive LEDs

### · Drive side diagnostics

###

### Enclosure LEDs

The DS400 Storage Subsystem provides 3 LED indicators located on the front of the storage enclosure. Shown in Figure 1, the three enclosure LEDs are defined in Table 1:

Figure 1 – Enclosure LEDs

Table 1. Storage Enclosure Disk Drive LED Descriptions

| Description | Color | Indication | ## Possible solution
LED 1 | Power On | Green | Normally ON: This indicates that power is being supplied to the enclosure. OFF indicates no power, or that there is an issue with the power supplies. | Check Power Supply LEDs. Refer to power supply LEDs table
LED 2 | Identification | Blue | Normally OFF. ON solid indicates that the enclosure is being identified. The enclosure management functionality on the RAID controller activates this LED when commanded to do so via a command from the Host. | N/A
LED 3 | Enclosure Fault | Amber | Normally OFF: This indicates that no faults exist in the enclosure. ON solid indicates that the storage enclosure has a fault. This LED is driven by the enclosure management functionality on the RAID controller. 1 | 1. Check LEDs for all components on enclosure (disk drives, power supplies, controllers) and follow the solution instructions provided for the respective illuminated LED. 2. If no other fault LED is on, first replace the controller: DS400 – 13N1780 3. Replace the chassis/backplane ASM 13N1786
1 The enclosure fault amber LED will be ON solid when one or more of the following conditions exist: Power supply fault Fan fault Overtemperature fault RAID controller module fault Battery fault Cache DIMM fault Xscale DIMM fault Disk drive fault Turned ON through SES control page

Controller LEDs

The FC-SCSI RAID controller has 8 status LED indicators and 2 LED indicators for each ports. These 12 LED indicators are located on each FC-SCSI RAID controller that is installed into the I/O option slots in the rear of the enclosure. Figure 2 and 3 show the location of the controller LEDs:

Figure 2. Controller panel

SP1= Serial Port 1: CLI port

SP2 = Serial Port 2: Debug port (for Engineering use only)

Figure 3. Controller LEDs

The 8 status LEDs are defined as follows:

| Description | Color | Indication | # Possible Solution
LED 1 | Controller Ready | Green | Normally ON: This indicates that the controller has successfully booted. | N/A
LED 2 | Battery Fault | Amber | ON indicates that the battery is not capable of sustaining memory in case of power loss. Possible causes include: Battery not present Battery charger circuit failure Battery temperature too high Battery voltage out of range Battery charge current out of range OFF indicates that the battery is capable of sustaining memory in case of power loss. | Remove the controller and replace the battery then reinsert the controller. Replacement battery: 13N1785
LED 3 | Cache Dirty | Amber | ON indicates that there is data in the cache that has not been written to a disk or synchronized to the redundant controller cache. | The Cache Dirty LED will go on and off at varying rates and durations during normal operation. No user action is required when this LED goes on. This also may indicate an improper controller shutdown. Restart the controller to flush the cache. WARNING! Do not remove power from the enclosure or remove the controller from the enclosure when a Cache Dirty LED is illuminated. Doing so could cause loss of data in the cache that is not mirrored. Note: This is not a FRU
LED 4 | Processor DIMM Fault | Amber | ON indicates that the Processor DIMM memory has failed. Possible causes include: Cannot read the DIMM configuration data Non-recoverable ECC failure. OFF indicates that the DIMM memory is operating normally. | 1. Replace the controller: DS400 – 13N1780
LED 5 | Cache DIMM Fault | Amber | ON indicates that the cache DIMM memory has failed. Possible causes include: Cannot read the DIMM configuration data Non-recoverable ECC failure OFF indicates that the cache DIMM memory is operating normally. | 1. Replace the DIMM 256MB DIMM – 73P4026 2. If theDIMM replacement does not fix the problem, replace the controller: DS400 – 13N1780
LED 6 | Controller Not Ready | Amber | ON indicates controller is not ready. | This indicates that the controller has not completed POST. Contact IBM Support center to attempt to recover the controller.
LED 7 | GbE Link Status | Green | ON indicates that the GbE link is up and operational. | First check the status on the switch. Then try another cable. Then another port on the same switch in the same network segment. Refer to PD Maps
LED 8 | GbE Activity | Green | ON indicates that packets are being transmitted or received. | First check the status on the switch. Then try another cable. Then another port on the same switch in the same network segment. Refer to PD Maps

The FC host port status LEDs are defined as follows:

LED 9 (11)- Green | LED 10 (12) - Amber | ##### Indication
On | On | Power on
On | Off | Online (normal operation)
Off | On | Link established (transitory condition)
Off | Flashing twice per second | Loss of synchronization
Alternate flashing twice per second | Alternate flashing twice per second | FC Chip fault
Off | Flashing once per second | Beacon

Power Supply LEDs

The power supply has one green Power OK LED indicator and one amber Fault LED indicator. The power supply LEDs are visible from the rear of the storage enclosure.

The green Power OK LED is ON when the power supply is operating normally.

The amber Fault LED is ON when the enclosure services module detects a fault. It flashes when the power/cooling module locate feature is selected.

The amber Fault LED will be ON solid when one or more of the following conditions exist:

- DC output fault
- AC input fault
- Fan fault
- Turned ON through SES control page

The FRU P/N for the power supply is 13N1784

###### Figure 4. Power Supply LEDs

###

### Hard Disk Drive LEDs

### Figure 5. Disk Drive LEDS

###

Each disk drive carrier has two LED indicators that are visible from the front of the storage enclosure. The green Activity LEDs are controlled directly by the SCSI disk drives; when ON, the Activity LEDs indicate activity. The amber Fault LEDs are controlled by the enclosure management circuitry; when ON, the Fault LEDs indicate a disk drive failure.

Drive Side Diagnostics

You can run limited diagnostic from one controller to any drive (either internal or in an expansion unit) using the Command Line Interface (CLI). The Read/Write buffer test command is issued to the selected drive from either controller. The drive side diagnostic verifies the path from the controller to the HDD and also ensures that the HDD is ready and accepting commands.

You perform the diagnostic from a Telnet CLI session. You must be in administrator mode to run diagnostics. For additional information on the CLI see Using the CLI.

Note: You may want to locate and identify the drive or drives in the enclosure in the event you need to re-seat or replace the drive. The identify device command syntax is shown in the following example.

DS400[X]# device identify

2304 2816 3328 3840 65792 66304 66816 start

2560 3072 3584 65536 66048 66560 67584 stop

The buffer test command syntax is shown in the following example. This command performs a read/write buffer and compare test on the specified drive, where device# is the specified drive.

buffer device# [iteration count] [stop-on-error]

Set iteration count to the desired value. A value of 100 takes about 45 seconds to run. Set the iteration count to continuous to run the test without a specified end. To stop the test, press Escape. To get intermediate results press Enter.

Set stop-on-error to stop on any error.

The following shows a sample CLI output:

Note: Make sure to halt I/Os before starting the test.

DS400[X]> administrator

DS400[X]# diag

DS400[X] (diag)# buffer

2304 2816 3328 3840 66560 67584

2560 3072 3584 66304 66816

DS400[X] (diag)# buffer 2304

<number of iterations> stop

continual

DS400[X] (diag)# buffer 2304 10

0 discrepancies discovered over 10 iterations

DS400[X] (diag)#

If the selected drive does not run this test successfully, then run the test on another drive. Return to the PD maps (click the Back button on your browser) for more help in isolating the problem.

Note: If you replace a drive, make sure you do a device scan from the CLI. The device scan syntax and a sample return message are shown in the following example:

DS400[X]# device scan

Scan complete.

New devices that have been discovered:

66816. IBM-ESXS Disk (enclosure 1 slot 5)

#### Device List

####

#### The list below shows the device Ids for a fully configured DS400 with two EXP400 units. Note that the devices Ids are the same for any DS400\EXP400.

All drives will always appear in the lists of controller A and B. Although drives are located on either the A or B side of the enclosure, this does not indicate controller ownership. Thus drives installed on either side of the enclosure may be owned by either A or B controller.

####

#### Figure 6 shows the ServeRaid manager graphic for the enclosure and the identifying parameters associated with each of the drives.

Internal drives – left bank (side B)
65536 IBM-ESXS Disk (enclosure 1 slot 0) SCSI Disk 68.37GB 65792 IBM-ESXS Disk (enclosure 1 slot 1) SCSI Disk 68.37GB 66048 IBM-ESXS Disk (enclosure 1 slot 2) SCSI Disk 68.37GB 66304 IBM-ESXS Disk (enclosure 1 slot 3) SCSI Disk 68.37GB 66560 IBM-ESXS Disk (enclosure 1 slot 4) SCSI Disk 68.37GB 66816 IBM-ESXS Disk (enclosure 1 slot 5) SCSI Disk 68.37GB 67584 IBM-ESXS Disk (enclosure 1 slot 6) SCSI Disk 68.37GB
Internal drives – right bank (side A)
2304 IBM-ESXS Disk (enclosure 1 slot 7) SCSI Disk 68.37GB 2560 IBM-ESXS Disk (enclosure 1 slot 8) SCSI Disk 68.37GB 2816 IBM-ESXS Disk (enclosure 1 slot 9) SCSI Disk 68.37GB 3072 IBM-ESXS Disk (enclosure 1 slot 10) SCSI Disk 68.37GB 3328 IBM-ESXS Disk (enclosure 1 slot 11) SCSI Disk 68.37GB 3584 IBM-ESXS Disk (enclosure 1 slot 12) SCSI Disk 68.37GB 3840 IBM-ESXS Disk (enclosure 1 slot 13) SCSI Disk 68.37GB
First expansion unit – left bank
131072 IBM-ESXS Disk (enclosure 2 slot 0) SCSI Disk 68.37GB 131328 IBM-ESXS Disk (enclosure 2 slot 1) SCSI Disk 68.37GB 131584 IBM-ESXS Disk (enclosure 2 slot 2) SCSI Disk 68.37GB 131840 IBM-ESXS Disk (enclosure 2 slot 3) SCSI Disk 68.37GB 132096 IBM-ESXS Disk (enclosure 2 slot 4) SCSI Disk 68.37GB 132352 IBM-ESXS Disk (enclosure 2 slot 5) SCSI Disk 68.37GB
First expansion unit – right bank
133120 IBM-ESXS Disk (enclosure 2 slot 7) SCSI Disk 68.37GB 133376 IBM-ESXS Disk (enclosure 2 slot 8) SCSI Disk 68.37GB 133632 IBM-ESXS Disk (enclosure 2 slot 9) SCSI Disk 68.37GB 133888 IBM-ESXS Disk (enclosure 2 slot 10) SCSI Disk 68.37GB 134144 IBM-ESXS Disk (enclosure 2 slot 11) SCSI Disk 68.37GB 134400 IBM-ESXS Disk (enclosure 2 slot 12) SCSI Disk 68.37GB 134656 IBM-ESXS Disk (enclosure 2 slot 13) SCSI Disk 68.37GB
Second expansion unit – left bank
196608 IBM-ESXS Disk (enclosure 3 slot 0) SCSI Disk 68.37GB 196864 IBM-ESXS Disk (enclosure 3 slot 1) SCSI Disk 68.37GB 197120 IBM-ESXS Disk (enclosure 3 slot 2) SCSI Disk 68.37GB 197376 IBM-ESXS Disk (enclosure 3 slot 3) SCSI Disk 68.37GB 197632 IBM-ESXS Disk (enclosure 3 slot 4) SCSI Disk 68.37GB 197888 IBM-ESXS Disk (enclosure 3 slot 5) SCSI Disk 68.37GB
Second expansion unit – right bank
198656 IBM-ESXS Disk (enclosure 3 slot 7) SCSI Disk 68.37GB 198912 IBM-ESXS Disk (enclosure 3 slot 8) SCSI Disk 68.37GB 199168 IBM-ESXS Disk (enclosure 3 slot 9) SCSI Disk 68.37GB 199424 IBM-ESXS Disk (enclosure 3 slot 10) SCSI Disk 68.37GB 199680 IBM-ESXS Disk (enclosure 3 slot 11) SCSI Disk 68.37GB 199936 IBM-ESXS Disk (enclosure 3 slot 12) SCSI Disk 68.37GB 200192 IBM-ESXS Disk (enclosure 3 slot 13) SCSI Disk 68.37GB

Figure 6 - ServeRAID manager enclosure graphics

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