AS7326-56X / AS7726-32X - FAN Failure Follow

Model : 

AS7326-56X / AS7726-32X

Procedure : 

Step-1 Please power cycle to the ACCTON-DIAG for troubleshooting

Step-2 Check the system LED of the FAN

The following figure is the system LED location for the AS7326-56X.

The following figure is the system LED location for the AS7726-32X.

The following table is the LED definition of the system fan for the AS7326-56X / AS7726-32X.

If fan led shows amber, please check all fan modules whether inserted the switch. 

If yes, please refer to steps 3~5 for debugging.

Step-3 Identify the fan number

The following figure is an AS7326-56X schematic diagram of FANs.

AS7326-56X has six fan modules.

The following figure is an AS7726-32X schematic diagram of FANs.

AS7726-32X has 4 fan modules.

Step-4 Check the rear panel LED of the fan module

Each fan module also has a LED on the rear panel, and LEDs are light in green color if it is in a normal state.

We can check whether it is the fan slot failure or fan module failure via the rear panel fan LED.

Please take the current failure fan and insert it into the adjacent fan slot.

• If the LED is green, then it is the fan slot failure.
• If the LED is red, then it is the fan module failure.

Both of the above situations are considered hardware failures, please refer to the RMA repair

service for the next process.

Step-5 Enter the command to check fan status on ACCTON-DIAG

The AS7326-56X / AS7726-32X have two kinds of fan modules with different airflow directions, one is

the F2B (front to back) another one is B2F (back to front).

There are two ways to identify the airflows of the switch.

The first way is the check the fan module of the lever color.

• The fan module of the red lever is front to back.
• The fan module of the blue lever is back to front.

So please check the airflows first then execute the correct command.

The second way is to check the model name of the switch.

Login to the ONIE then executes onie-syseeprom to check.

For the below example model name is 7726-32X-O-AC-F and -F is front to back.

In other words, if show the -B, i.e back to front.

ONIE:/ # onie-syseeprom
TlvInfo Header:
Id String: TlvInfo
Version: 1
Total Length: 172
TLV Name Code Len Value
-------------------- ---- --- -----
Manufacture Date 0x25 19 11/19/2018 15:31:11
Label Revision 0x27 4 R01A
Platform Name 0x28 27 x86_64-accton_as7726_32x-r0
Manufacturer 0x2B 6 Accton
Country Code 0x2C 2 TW
Serial Number 0x23 14 772632X1846014
Part Number 0x22 13 FP3ZZ7632074A
MAC Addresses 0x2A 2 256
Vendor Name 0x2D 8 Edgecore
Product Name 0x21 15 7726-32X-O-AC-F
ONIE Version 0x29 13 2017.11.00.05
Base MAC Address 0x24 6 3C:2C:99:F8:DB:40
Diag Version 0x2E 11 01.01.01.02
CRC-32 0xFE 4 0x55029543
Checksum is valid.

• If all the fan modules are working properly, then the result will show "PASS".

root@(none):/# fanmod_AirFlow_DefaultRPM_F2B
Fan Module Air Flow and Default Speed Check(front to back) ..............
Speed [FAN-FRONT0]: 9300 OK
Speed [FAN-REAR0]: 8400 OK
Speed [FAN-FRONT1]: 9200 OK
Speed [FAN-REAR1]: 8400 OK
Speed [FAN-FRONT2]: 9100 OK
Speed [FAN-REAR2]: 8400 OK
Speed [FAN-FRONT3]: 9100 OK
Speed [FAN-REAR3]: 8500 OK
Speed [FAN-FRONT4]: 9000 OK
Speed [FAN-REAR4]: 8000 OK
Speed [FAN-FRONT5]: 8700 OK
Speed [FAN-REAR5]: 8100 OK
Fan Module Air Flow and Default Speed Check(front to back): PASS

• If one of the fan modules is abnormal, then the result will show "fail".

root@(none):/# fanmod_AirFlow_DefaultRPM_F2B
Fan Module Air Flow and Default Speed Check(front to back) ..............
Speed to low [FAN-FRONT0]: 0 < 6600
Speed to low [FAN-REAR0]: 0 < 5400
Speed [FAN-FRONT1]: 9000 OK
Speed [FAN-REAR1]: 8400 OK
Speed [FAN-FRONT2]: 9100 OK
Speed [FAN-REAR2]: 8500 OK
Speed [FAN-FRONT3]: 9100 OK
Speed [FAN-REAR3]: 8500 OK
Speed [FAN-FRONT4]: 8900 OK
Speed [FAN-REAR4]: 8100 OK
Speed [FAN-FRONT5]: 8800 OK
Speed [FAN-REAR5]: 8100 OK
Fan Module Air Flow and Default Speed Check(front to back): FAIL

All the above, if the FAN test result is FAIL, please return the unit back for RMA repair service.