Limited Number of Sun Fire T2000 and SPARC Enterprise T2000 Servers may Experience a Shutdown with SC Alert "Chassis cover removed"

Asset ID:	1-77-1020306.1
Update Date:	2011-03-22
Keywords:

Solution Type Sun Alert Sure

Solution 1020306.1 : Limited Number of Sun Fire T2000 and SPARC Enterprise T2000 Servers may Experience a Shutdown with SC Alert "Chassis cover removed"

1. Impact

A limited number of Sun Fire T2000 and SPARC Enterprise T2000 servers may experience a system shutdown after the System Controller (SC) Alert: "Chassis cover removed" is displayed on the console, causing system downtime.

In addition, this issue may result in unnecessary hardware replacement.

2. Contributing Factors

This issue can occur on the following platforms:

Sun Fire T2000 Server without patch 139434-02

Note: This issue rarely occurs and has only been observed on the above mentioned T2000 servers.

3. Symptoms

The system will report the following errors on the system console, which will also be recorded in the ALOM logs. An example from 'showlogs -v' would be similar to the following:

    02:24:25: 0004007c: "System poweron is disabled."
    02:24:25: 00040083: "Chassis cover removed."
    02:24:25: 0004000e: "SC Request to Power Off Host Immediately."
    02:24:26: 0004004f: "Indicator SYS/ACT is now STANDBY BLINK"
      02:24:27: 0004007d: "System poweron is enabled."
    02:24:31: 00040029: "Host system has shut down."

As shown in the example, the key to identify this issue is that in the logs, the line "Chassis cover removed" will be followed by the line "SC Request to Power Off Host Immediately". If the line "SC Request to Power Off Host Immediately" is missing from the above message, then this is a different issue and may indicate a hardware condition with the cover interlock switch.

4. Workaround

There is no workaround. Please see Resolution below.

5. Resolution

This issue is addressed on the following platform:

Sun Fire T2000 Server with patch 139434-02 or later

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Modification History
01-Apr-2009: updated Workaround section
16-Apr-2009: updated Contributing Factors and Resolution sections. Now Resolved.

Internal Eng Responsible Engineer
[email protected], [email protected]

Internal Contributor/submitter
[email protected]

Internal Services Knowledge Engineer
[email protected]

Internal Eng Business Unit Group
SSG WGS (Workgroup Systems)

Internal Sun Alert & FAB Admin Info
26-Mar-2009: karen, created based on FAB and request from customer. Sending to sunalert_review today.

Internal Comments (for SAs)

Root Cause

The suspected root cause is invalid CI (Chassis Intrusion) bit read
from the ADM1026, either caused by i2c corruption or low ADM1026 CI pin
noise tolerance. Also, the ALOM shutdown (based on SystemPowerON
check) after failed Read from ADM1026 should be disabled, because in a
real CI, the FPGA will have already turned off power.

So the poweron check, in conjuction with the root cause (i2c corruption
or over-sensitive adm1026 CI pin), causes the host to power off with
the message "SC Request to Power Off Host Immediately".

A firmware patch is being developed to permit up to three retry reads
to ADM1026, with clear in between to confirm status. If ALOM is still
reporting a chassis cover problem after 3 tries, it will display a
message, but will NOT shutdown the box.

Per CR 6815610:

The fix for this will involve 4 changes:

a) there should be multiple retries for the read, 3 retries seems reasonable.

b) the error message should only be printed after the last failed retry

c) the message text should change to "Chassis cover interlock open" It needs

to be investigated if this can be done by changing just the text or if a new

event needs to be created.

d) if the fault has cleared by the next monitoring cycle a fault cleared message

should be printed "Chassis cover interlock is OK"

see also FAB 254469

http://sunsolve.sun.com/search/document.do?assetkey=1-63-254469-1

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