Although I do believe RO1 is considered Diverse and RO2 is considered Diverse and Redundant?
Andrew Symons Managing Director | Sota Solutions Ltd 300 Cornforth Drive, Kent Science Park, Sittingbourne, Kent, ME9 8PX T: 01795 413500 | F: 01795 413501 W: http://www.sota.co.uk/ E: mailto:[email protected] Any opinions expressed in this email are those of the individual and not necessarily those of Sota Solutions Limited. It is intended only for the person(s) to whom it is addressed and may contain privileged and/or confidential information. Accordingly, the copying, dissemination, distribution, or use of this message to any other person may constitute a breach of Civil or Criminal Law. Please notify the sender immediately if you have received this email by mistake and delete it from your system. [Sota Solutions Ltd is registered in England number 2346249] -----Original Message----- From: uknof [mailto:[email protected]] On Behalf Of Neil J. McRae Sent: 17 October 2018 12:15 To: Paul Civati <[email protected]> Cc: [email protected] Subject: Re: [uknof] Power Delivery Definitions I would agree with you. Both redundant and diverse should ensure that a failure to anyone component shouldn’t have affected both supplies. Sent from my iPhone > On 17 Oct 2018, at 11:34, Paul Civati <[email protected]> wrote: > >> On 17 Oct 2018, at 11:10 am, Robert Williams <[email protected]> wrote: >> >> Thus, the overall claim that our dual feed racks have “Redundant Diverse >> Power” is, IMHO, false. > > Unfortunately as I found out to my own cost, DC providers are vague on > these things and get away with it. If you walk into a facility that > looks the part, and they talk the talk, you can be fooled into believing > things are redundant or even up to spec when they aren't. > > The simple fact is that you have to get it all nailed down in writing > or all the talk of redundancy is finger in the air stuff. > > Even then, asking for N+1 power feeds, and N+1 UPS, you almost need a > schematic of how it’s all connected to be fully aware of the failure modes. > > Too much of all this stuff is marketing BS in my experience. > > Finally, a lot of SLAs are so weak that they find ways of getting > around them, or even if you make an SLA claim, the payout in no way > compensates for the level pain you will incur during down time. > > -Paul- > >
