| From: | Levente Birta <blevi(dot)linux(at)gmail(dot)com> |
|---|---|
| To: | pgsql-performance(at)postgresql(dot)org |
| Subject: | Re: Capacitors, etc., in hard drives and SSD for DBMS machines... |
| Date: | 2016-07-08 10:36:46 |
| Message-ID: | f297b794-1026-942e-142e-79bc250611e3@gmail.com |
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| Lists: | pgsql-performance |
On 08/07/2016 13:23, Jean-David Beyer wrote:
> Why all this concern about how long a disk (or SSD) drive can stay up
> after a power failure?
>
> It seems to me that anyone interested in maintaining an important
> database would have suitable backup power on their entire systems,
> including the disk drives, so they could coast over any power loss.
>
> I do not have any database that important, but my machine has an APC
> Smart-UPS that has 2 1/2 hours of backup time with relatively new
> batteries in it. It is so oversize because my previous computer used
> much more power than this one does. And if my power company has a brown
> out or black out of over 7 seconds, my natural gas fueled backup
> generator picks up the load very quickly.
>
> Am I overlooking something?
>
UPS-es can fail too ... :)
And so many things could be happen ... once I plugged out the power cord
from the UPS which powered the database server (which was a production
server) ... I thought powering something else :)
but lucky me ... the controller was flash backed
--
Levi
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