Sun Fire/Netra T2000 hard disk drive OK LED does not light.

Asset ID:	1-72-1590418.1
Update Date:	2017-10-05
Keywords:

Solution Type Problem Resolution Sure

Solution 1590418.1 : Sun Fire/Netra T2000 hard disk drive OK LED does not light.

Applies to:

Sun Netra T2000 Server - Version All Versions to All Versions [Release All Releases]
Sun Fire T2000 Server - Version All Versions to All Versions [Release All Releases]
Sun SPARC Enterprise T2000 Server - Version All Versions to All Versions [Release All Releases]
SPARC T4-1
Information in this document applies to any platform.

Symptoms

This problem occurs when the hard disk is operating properly, but it's OK LED is turned off. The Service manual indicates:

Hard Drive LEDs
   Activity green • On – Drive is receiving power. Solidly lit if drive is idle.
                • Flashing – The drive is processing a command.
                • Off – Power is off

The output of 'format' command shows the properly operational disk:

# format
Searching for disks...done

AVAILABLE DISK SELECTIONS:
       0. c0t0d0 <SUN72G cyl 14087 alt 2 hd 24 sec 424>
          /pci@780/pci@0/pci@9/scsi@0/sd@0,0

       1. c0t1d0 <SUN72G cyl 14087 alt 2 hd 24 sec 424>      <<<<<<<<<< (example)
          /pci@780/pci@0/pci@9/scsi@0/sd@1,0

From Alom, the disk LED appears to be normal:

sc> showenvironment

--------------------------------------------
System Disks:
--------------------------------------------
Disk   Status            Service OK2RM
--------------------------------------------
HDD0   OK                OFF      OFF
HDD1   OK                OFF      OFF       <<<<<<<<<< (example)
HDD2   NOT PRESENT       OFF      OFF
HDD3   NOT PRESENT       OFF      OFF

If you have any concern regarding disk health, you can follow the document:

Diagnosing I/O errors for failing device on V210/V240/V215/V245/V440/V445, Netra 210/240/440, T1000/T2000/Netra T2000, V480/V490/V880/V890 servers (Doc ID 1013114.1)

Cause

Probable causes are:

A faulty or poorly seated disk (or it's lightpipe),
An I2C bus problem which travels from the system board through the PDB to the disk backplane.

Solution

The order of resolution would be to (stop once resolved since most likely solutions listed first):

Reseat the disk,
Inspect the PDB to system board & PDB to disk backplane ribbon cables for seating & damage,
Replace the disk,
Replace the disk bacplane FRU(s),
Replace the PDB,
Replace the ALOM / SP,
Replace the Ribbon Cables,
Replace the system board.

References

<BUG:15788899> - SUNBT7165492 MULTIPLE T2000 SYSTEMS EXPERIENCING WHAT APPEARS AS A BAD LED, NO P

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