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I did not received any error message about power supply malfunction (in a previous post I read that power failure are sent by email or recorded in system log). Meanwhile I decided to check power supply and I found four electrolitical condenser with a mismatching capacity (lower than prevised) - changing these condensers all seems work fine.
I don't know where you read that you'd receive an email about a power supply issue, but that is rarely the case. It does sound like a power supply issue to me, and hopefully changing those capacitors will do the trick. If it doesn't, then it can be replaced with an SFX format supply, though you'll likely need a 24-pin extension and a 4-pin Molex splitter or SATA to Molex adapter (or two). I recommend at least a 350W supply to insure there is sufficient 12V, even though the original is a 300W.
Actually, the configuration for many ReadyNAS models has no monitoring of some or all of the internal voltages. I assume that's because the hardware has no monitoring provisions. Also, there is a huge difference in how a unit with an internal multi-voltage supply (like your Ultra6) and one with an external 12V brick (like the Pro2 from that message) handle things.
And, more importanly, voltage issues often occur so quickly that the NAS locks up or re-boots before it has time to record an error, even if it has a monitor for it.
