Subject: Re: Capacitors, etc., in hard drives and SSD for DBMS
 machines...
To: pgsql-performance@postgresql.org
References: <577F7F2A.10307@verizon.net>
From: Levente Birta <blevi.linux@gmail.com>
Message-ID: <f297b794-1026-942e-142e-79bc250611e3@gmail.com>
Date: Fri, 8 Jul 2016 13:36:46 +0300
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:45.0) Gecko/20100101
 Thunderbird/45.2.0
MIME-Version: 1.0
In-Reply-To: <577F7F2A.10307@verizon.net>
Content-Type: text/plain; charset=iso-8859-2; format=flowed
Content-Transfer-Encoding: 7bit
Precedence: bulk
Sender: pgsql-performance-owner@postgresql.org

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


-- 
Sent via pgsql-performance mailing list (pgsql-performance@postgresql.org)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-performance