| From: | Stefan Kaltenbrunner <stefan(at)kaltenbrunner(dot)cc> |
|---|---|
| To: | "Joshua D(dot) Drake" <jd(at)commandprompt(dot)com> |
| Cc: | Gregory Stark <stark(at)enterprisedb(dot)com>, Simon Riggs <simon(at)2ndquadrant(dot)com>, Bernd Helmle <mailings(at)oopsware(dot)de>, mfatticcioni(at)mbigroup(dot)it, pgsql-performance(at)postgresql(dot)org |
| Subject: | Re: DRBD and Postgres: how to improve the perfomance? |
| Date: | 2007-09-08 16:33:55 |
| Message-ID: | 46E2CEF3.1030908@kaltenbrunner.cc |
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| Lists: | pgsql-performance |
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 ...
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 ....
Stefan
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