We have one case which we see how important it is for battery to function to maintain performance. Without backup battery, the storage controller will function in write through mode, this seriously impact the storage performance as can be seen in customer's system.
The performance is 3 times slower than write back mode. Though it is possible to still run in write back mode without backup battery, the system risk losing data in case of power outage.
All problem gone when we replaced the battery.
:)
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