This morning we received a diagnostic notification from the array controller for MX record mail2.rollernet.us that the battery backup unit (BBU) heath check had failed. As such, we will be replacing it ASAP as an emergency maintenance event. There is no major operational impact from this event as the array continues to operate in a failsafe mode without its write cache enabled. We will update this post when we set a time to replace the BBU.
[20100914 11:53] The replacement battery has arrived. We are preparing to remove the affected server from the rack; replacing the BBU requires the server to be powered down.
[20100914 12:07] BBU replacement in progress.
[20100914 12:21] BBU replacement complete.