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Hardware Thread, Which UPS? in Technical; In my last place I worked it out that we used to get power cuts every few weeks (being rural). ...
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    glennda's Avatar
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    In my last place I worked it out that we used to get power cuts every few weeks (being rural). these tended to never last longer then 10-15 mins. So I worked it out that we could keep it running for 15 mins. At which point they would shut down (for a prolonged outage). I gave it 25 mins for a full shutdown (12 physical hosts). So overall about 40/45 mins or so.

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    SYNACK's Avatar
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    Quote Originally Posted by fiza View Post
    What do people have as their runtimes in schools? I am not sure what to go for. I always thought I just needed enough time for the Servers to shutdown gracefully but now it seems that people want continued availability.
    If they want that then they need to be shown the quotes for UPS + generator + matinence + testing + fuel etc. Some expectations need to be shown up as to how expencive they really are.

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    Quote Originally Posted by localzuk View Post
    Ours run for about 30 minutes at the moment. When we do our virtualisation project this summer, this will increase to an hour or more though.

    Continued availability is great but none of the clients have UPSs...
    So what does the 30 minutes or the hour give you? As you say the clients dont have UPSs.

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    Quote Originally Posted by glennda View Post
    In my last place I worked it out that we used to get power cuts every few weeks (being rural). these tended to never last longer then 10-15 mins. So I worked it out that we could keep it running for 15 mins. At which point they would shut down (for a prolonged outage). I gave it 25 mins for a full shutdown (12 physical hosts). So overall about 40/45 mins or so.
    That makes sense. My main priority would be to allow the servers to shutdown gracefully rather than give users more time.

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    localzuk's Avatar
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    Quote Originally Posted by fiza View Post
    So what does the 30 minutes or the hour give you? As you say the clients dont have UPSs.
    It means no hassle having to start them up if the power outage is less than that.

    Plus, our phone system is plugged into it.

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    fiza (8th June 2012)

  7. #21

    glennda's Avatar
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    Quote Originally Posted by fiza View Post
    That makes sense. My main priority would be to allow the servers to shutdown gracefully rather than give users more time.
    The first 15 mins is just incase the power comes back on again, Then shutdown the servers gracefully.

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    fiza (8th June 2012)

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    Quote Originally Posted by fiza View Post
    That makes sense. My main priority would be to allow the servers to shutdown gracefully rather than give users more time.
    i don't think it's unreasonable to start thinking of runtime in terms of hour+ rather than minutes these days. Particularly where you've virtualised using modern, more energy efficient servers with dual power supplies (which reduces the power draw on individual ups'es if you have 2 for redundancy)

    this could apply to virtual servers, SAN and core switch. a redundant 3kva ups setup running at 60% capacity with one additional battery back could keep a single cab (assuming your core infrastructure now consists of 3 2u vm hosts rather than 12 or more physical boxes) going for quite a while. Certainly enough in case the power comes back on.



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