Re: DRBD and Postgres: how to improve the perfomance?

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Stefan Kaltenbrunner wrote:
> Joshua D. Drake wrote:
>> Gregory Stark wrote:
>>> "Simon Riggs" <simon(at)2ndquadrant(dot)com> writes:
>>>> You're right, but the distinction is a small one. What are the chances
>>>> of losing two independent servers within a few milliseconds of each
>>>> other?
>>> If they're on the same power bus?
>> That chance is minuscule or at least should be. Of course we are
>> assuming some level of conditioned power that is independent of the
>> power bus, e.g; a UPS.
>
> how is that making it different in practise ? - if both are on the same
> UPS they are affectively on the same power bus ...

Well I was thinking the bus that is in the wall. I would assume that
people were smart enough to have independent UPS systems for each server.

city power->line conditioning generator->panel->plug->UPS->server

wash, rinse repeat.

> If the UPS fails (or the generator is not kicking in which happens way
> more often than people would believe) they could still fail at the very
> same time ....

Sincerely,

Joshua D. Drake

>
>
> Stefan
>
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