Data ONTAP® 8.0.4 and 8.1.2 address an issue where N7950T NVRAM8 battery stops charging.

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Abstract

IBM has identified an issue with N7950Tsystems that can lead to a disabled NVRAM8 battery charger.

Content


IBM has identified an issue with N7950Tsystems that can lead to a disabled NVRAM8 battery charger. Once the charger is disabled, the NVRAM8 battery will drain naturally and will eventually reach the 'warning low', and subsequently, the 'critical low' levels. When the NVRAM8 battery reaches the 'critical low' capacity, the system initiates a 24-hour shutdown sequence.
Data ONTAP 8.0.4 and 8.1.2 include new battery firmware that addresses this issue. The battery firmware will be updated as part of the Data ONTAP upgrade and cannot be downloaded or upgraded separately.
IBM recommends an upgrade to Data ONTAP 8.0.4 or 8.1.2 as soon as convenient to avoid any possible impact from this issue.

Problem Description
A N7950T system with the NVRAM8 battery charger in a disabled state will eventually drain to the 'warning low' and 'critical low' levels. When the NVRAM8 battery reaches the 'critical low' capacity, the system initiates a 24-hour shutdown sequence. It typically takes over one year of continuous operation before this issue can occur.

Symptom
This issue applies to any N7950T system running NVRAM8 battery firmware prior to '0.0.40', which is the new level displayed by the sysconfig –M command for Data ONTAP versions 8.1.2 and 8.0.4.

When the battery charger becomes disabled, the issue can be detected by examining the NV charging_status value in the output of the environment.txt or environment section of an AutoSupport message. If the value of NV charging_status is 528, the battery charger is disabled. A discharging battery will eventually reach the 'warning low' level of 299 mAh 'runtime', and subsequently, the 'critical low' level of 279 mAh 'runtime'. When the battery reaches the 'warning low' level, the system logs an hourly environmental warning message. When the battery reaches the 'critical low' level, the system initiates a 24-hour shutdown sequence and, if enabled, an AutoSupport notification is sent.


Workaround
If the charger gets disabled prior to the NVRAM8 battery firmware upgrade, a power-cycle of the storage system will clear the issue and the charger will no longer be disabled. This workaround will allow for approximately one year of operation before the charger gets disabled again.

Solution: Data ONTAP releases which have fixed this problem
The IBM Data ONTAP 8.0.4 and 8.1.2 releases contain new battery firmware that resolves this issue. The new battery firmware is bundled with the Data ONTAP software and is automatically updated when the system reboots after an upgrade.
The new battery firmware can also be installed by temporarily installing Data ONTAP 8.0.4 or 8.1.2, and downgrading back to the original Data ONTAP 8.x version with which the system was operating.

Battery packs of revision C0 or later also has the firmware fix to prevent this problem from occurring.

Note: 'NVRAM Batt Current' must be 0 mA for the firmware update to complete. Ensure that 'Batt Current' is 0 mA prior to upgrading Data ONTAP. 'NVRAM Batt Current' is reported by the environment status chassis command. If Data ONTAP is upgraded when 'Batt Current' is not 0 mA, a reboot is required to update the battery firmware.

For systems indicating that 'NV Charging status' is 528:

    1. Upgrade and boot Data ONTAP without a power cycle. This will upgrade the battery firmware. This should be confirmed by running the sysconfig –M command and checking if the battery firmware revision is 0x40 or later. It will be 0x42 if Data ONTAP had to update firmware with a revision earlier than 0x040.
    2. Power cycle the system from the SP. This will clear the FC-MTO flag and the system will no longer report NV Charging status = 528.
    3. Another reboot without a power cycle is required to display the correct battery firmware revision. The battery firmware revision can be reported as 0x00 after the previous power cycle and will report 0x42 after this subsequent reboot.

Cross reference information
Segment Product Component Platform Version Edition
Network Attached Storage (NAS) System Storage N7950T M/T 2867-E22 Not Applicable

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Document information


More support for:

Data ONTAP

Version:

Not Applicable

Operating system(s):

Data ONTAP

Reference #:

S1004295

Modified date:

2014-07-09

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