About Exadata nodes Raid Controller Battery replacement

Exadata Raid controller batteries can run down after 18 months (ref: Oracle-Ninja). This can affect performance..

Reasons for Battery Replacement: (Ref: Support Doc : 1274318.1)

1)Full Charge Capacity <=800 mAh and Max Error<=%10
2)Max Error >=%10
3)Full Charge Capacity <647 mAh

These can be controlled by executing following commands;

For checking Cache policy:

/opt/MegaRAID/MegaCli/MegaCli64 -LDInfo -LALL -aALL | grep "Cache Policy"
(Note that , Write Back should be displayed.. If Write Through will be displayed here, then battery should be replaced..)

For checking Charge capacity and errors:

/opt/MegaRAID/MegaCli/MegaCli64 -AdpBbuCmd -a0 | grep "Full Charge" -A5 | sort | grep Full -A1