Hi Hiroki,  I would open an SR (and make sure logs are gathered) for support to look at this.  It is probably nothing, but better safe than sorry.  Cheers,Matt 
Hello,  My customer got a notification which is saying NVRAM voltage got higher and got 4.83V. However his battery status shows "okay". (I'm not sure the actual notification message so that I assume it's like "Voltage 5v NVRAM out of spec." of event code 900060012 or 900080036.  Is the event a predictor of obstacle? Otherwise is it just a event which the voltage went over the limit for just a moment and we don't have to care about that? Is it possibility to take fire if it continues to be used until broken? I found the following on page 65 of "Isilon OneFS Version 7.2.1 Event Reference" for event code 900060010 but I don't understand well.  A node has experienced coalesced voltage measurement events. This alert represents an accumulation of a large series of events in a short amount of time. Coalesced events can indicate a serious issue and are best addressed one event at a time.  Best regards, Hiroki
High NVRAM voltage