Sun Fire X2100 Server
 

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Applies to:

Symptoms

 The system will hang or report disk errors. On rebooting, the disk is no longer detected by the BIOS.

Cause

 Incorrect design margin for OCP (Over Current Protection).

Solution

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Product
Sun Fire X2100 Server

Bug Id
<SUNBUG: 6470659>

Date of Resolved Release
30-APR-2007

Part

• Part No: 371-0733-01
• Part Description: Disk Backplane

Part

• Part No: 371-1605-01
• Part Description: Disk Backplane (RoHS version)

Impact

The system will hang or report disk errors. On rebooting, the disk is no longer detected by the BIOS. There is no risk of data corruption or data loss due to this issue.

Contributing Factors

All Sun Fire X2100 Servers shipped prior to April 17, 2007 and having either of the following are potentially impacted:

1. A single internal disk drive in Slot 0 or
2. Disks in both Slot 0 and Slot 1

Symptoms

The system will hang or report disk errors. On rebooting, the disk is no longer detected by the BIOS.

Root Cause

Incorrect design margin for OCP (Over Current Protection).

The disk backplane has been reworked to meet the original design margin for OCP (Over Current Protection). An ECO was implemented that changed R3, R18 from 620ohms to 825ohms and R4, R19 from 953ohms to 1.2kohms.

ECO# WO_35539 was cut into the factory on April 17, 2007 with the new backplane design. GSAP #3894 was published on April 30, 2007 to purge the RSLs of the old backplanes and replace with the new design.

Workaround

There is a workaround for customers that are using only one disk. Moving the disk from slot 0 to slot 1 has proven to be an effective solution for customers that have seen this issue and are only using one disk.

Resolution

Upon failure only replace 371-0733-01 or 371-1605-01 with 371-1605-02.

Identification of Affected Parts (how to):

The Disk Backplanes must be visually inspected to determine if they are impacted by this issue.

The two disk backplane part numbers that are affected are 371-0733-01 and 371-1605-01. System serial numbers that are affected are as follows:

1. Systems built in the UK with serial numbers prior to 0723TU114H, and
2. Systems built in the US with serial numbers prior to 0719FU4001.

Note: The fifth and sixth alpha-numeric characters denote where the unit was built.

TU = units built in the UK
FU = units built in the US

Comments

The new disk backplanes (371-1605-02) are available in all Regions at the time on this asset's publication.

This issue was fully evaluated and found not be meet FCO criteria due to the availability of a workaround, and because there have been few reported incidences of this occurring in the field.

References

•    ECO: WO_35539
•    GSAP: 3894

Previously Published As 102990

Contributor/submitter: [email protected]
Eng Responsible Engineer: [email protected]
Services Knowledge Engineer: [email protected]
Kasp FAB Legacy ID: 102990

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