We are aware of an incident that is affecting the RAID controller on an-worker1081.
The RAID cache battery backup appears to have been fully discharged and is not charging, therefore the cache has switched from WriteBack to WriteThrough for each of the 13 logical drives.
https://icinga.wikimedia.org/cgi-bin/icinga/extinfo.cgi?type=2&host=an-worker1081&service=MegaRAID
Examining the RAID controller states that the battery doesn't need replacing:
btullis@an-worker1081:~$ sudo megacli -AdpBbuCmd -aALL|grep -i replace Battery Replacement required : No Pack is about to fail & should be replaced : No
...but it doesn't seem to be charging either.
The full output from megacli is here:
btullis@an-worker1081:~$ sudo megacli -AdpBbuCmd -aALL
BBU status for Adapter: 0
BatteryType: BBU
Voltage: 3387 mV
Current: 0 mA
Temperature: 49 C
Battery State: Degraded(Need Attention)
A manual learn is required.
BBU Firmware Status:
Charging Status : None
Voltage : OK
Temperature : OK
Learn Cycle Requested : Yes
Learn Cycle Active : No
Learn Cycle Status : OK
Learn Cycle Timeout : No
I2c Errors Detected : No
Battery Pack Missing : No
Battery Replacement required : No
Remaining Capacity Low : Yes
Periodic Learn Required : No
Transparent Learn : Yes
No space to cache offload : No
Pack is about to fail & should be replaced : No
Cache Offload premium feature required : No
Module microcode update required : No
BBU GasGauge Status: 0x0128
Relative State of Charge: 15 %
Charger Status: Unknown
Remaining Capacity: 91 mAh
Full Charge Capacity: 632 mAh
isSOHGood: Yes
Battery backup charge time : 0 hours
BBU Capacity Info for Adapter: 0
Relative State of Charge: 15 %
Absolute State of charge: 0 %
Remaining Capacity: 91 mAh
Full Charge Capacity: 632 mAh
Run time to empty: Battery is not being charged.
Average time to empty: 7 Min.
Estimated Time to full recharge: Battery is not being charged.
Cycle Count: 2
Max Error = 0 %
Remaining Capacity Alarm = 0 mAh
Remining Time Alarm = 0 Min
BBU Design Info for Adapter: 0
Date of Manufacture: 00/00, 0000
Design Capacity: 460 mAh
Design Voltage: 0 mV
Specification Info: 0
Serial Number: 0
Pack Stat Configuration: 0x0000
Manufacture Name: 0x113
Firmware Version : 0.6
Device Name:
Device Chemistry:
Battery FRU: N/A
Module Version = 0.6
Transparent Learn = 1
App Data = 1
BBU Properties for Adapter: 0
Auto Learn Period: 90 Days
Next Learn time: None Learn Delay Interval:0 Hours
Auto-Learn Mode: Disabled
Exit Code: 0x00I tried triggering a learn cycle with sudo megacli -AdpBbuCmd -BbuLearn -aAll but it doesn't seem to have worked.
