Field Notice: FN - 63975 - Nexus 7000 Supervisor 2 and 2E Embedded Flash Write Error - Software Upgrade Recommended

Notice

THIS FIELD NOTICE IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTY OF MERCHANTABILITY. YOUR USE OF THE INFORMATION ON THE FIELD NOTICE OR MATERIALS LINKED FROM THE FIELD NOTICE IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS FIELD NOTICE AT ANY TIME.

Revision History

Revision	Publish Date	Comments
1.0	29-May-15	Initial Release
10.0	12-Oct-17	Migration to new field notice system
11.0	15-Jan-18	Update the bug details - Revised the scope of the field notice to include CSCvf36683
11.0	13-Feb-18	Correcting the MDF tags

Products Affected

Affected Product ID	Comments
N7K-SUP2
N7K-SUP2E

Defect Information

Defect ID	Headline
CSCus22805	N7K-SUP2/E: Compact Flash Failure or Unable to Save Configuration
CSCvf36683	N7K-SUP2/E: eUSB Flash Failure or Unable to Save Configuration

Problem Description

Cisco has identified an issue which might prevent write operations to the onboard embedded flash devices on Nexus 7000 Supervisor 2 (N7K-SUP2) and Supervisor 2E (N7K-SUP2E) modules that run NX-OS releases from Release 6.1(1) to 6.2(18), 7.2(1)D1(1) to 7.2(2)D1(2), 7.3(0)D1(1) to 7.3(2)D1(2), 8.0(1), 8.1(1), and 8.2(1).

The issue is also documented in Cisco bug IDs CSCus22805 and CSCvf36683.

This is not a hardware-related issue which can be resolved by a Return Material Authorization (RMA).

Background

Each Nexus 7000 Supervisor 2/2E is equipped with two onboard embedded flash devices in a Redundant Array of Independent Disks (RAID) configuration. After continuous operation, one of the onboard embedded flash devices might experience a transient error which removes that device from the RAID array. However, the system continues to function normally because of the built-in redundancy.

Problem Symptom

In order to check the current status of all available RAID devices on the system, enter the show system internal file /proc/mdstat command:

switch# show system internal file /proc/mdstat

Personalities : [raid1]

md6 : active raid1 sdc6[0] sdb6[1]
77888 blocks [2/2] [UU]

md5 : active raid1 sdc5[0] sdb5[1]
78400 blocks [2/2] [UU]

md4 : active raid1 sdc4[0] sdb4[1]
39424 blocks [2/2] [UU]

md3 : active raid1 sdc3[0] sdb3[1]
1802240 blocks [2/2] [UU]

unused devices: 

switch#

If a standby supervisor is available and online, attach to it and check the status of RAID devices on it also.

In the previous output there are four partitions, md3 through md6, mounted to store boot images and other persistent configuration data. For each disk partition, a status [2/2] indicates that there are two disks configured and running. [UU] indicates the current status of each disk and identifies the status as "U"p and running. Any status other than [2/2] [UU] might indicate a degraded RAID array where the status for any failed disk will be displayed as "_". For example, the status shown such as "[2/1] [_U]" or "[2/1] [U_]" indicates a degraded RAID array configuration. It is recommended to recover the offline disks and get them added back into a RAID array as soon as possible. Complete the recovery steps in the Workaround/Solution section.

Workaround/Solution

Follow the compact flash upgrade procedure described in Nexus 7000: N7k-Sup2/E Compact Flash Upgrade Procedure.

The fix for this issue has been integrated into NX-OS Release 6.2(20). This fix will also be integrated into upcoming maintenance releases for other Nexus 7000 NX-OS releases.

For More Information

If you require further assistance, or if you have any further questions regarding this field notice, please contact the Cisco Systems Technical Assistance Center (TAC) by one of the following methods:

• Open a service request on Cisco.com
• By email
• By telephone

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