Re: Kernel 3.11 and Fedora 19...

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On Sat, 7 Sep 2013 09:20:29 -0300
Fernando Cassia <fcassia@xxxxxxxxx> wrote:

> On Sat, Sep 7, 2013 at 9:16 AM, Heinz Diehl <htd@xxxxxxxxxx> wrote:
> >
> > I'm not aware of such a feature added to 3.11. In case you mean
> > "bcache": it works as a block layer cache (similar to dm-cache),
> > which allows to use a solid state drive to work as a cache for a
> > rotational harddisk on the same system.
> 
> Exactly, thats the one and came with 3.10... versions move too fast I
> ended up mixing up them.
> 
> http://kernelnewbies.org/Linux_3.10#head-a0ad787f2e030b53bdabbb4b6e22e7ed16803bb1

Note though, that this feature will not minimize the writes to the SSD.
Quite the opposite, it will use SSD as a caching mechanism for slower
HDDs --- it will tend to *maximize* writes to SSD in order to minimize
the usage of HDDs, and thereby increase performance. Of course, at the
cost of wearing out SSDs sooner rather than later.

So if you want to maximize the life of your SSD, you want to make sure
that this feature is turned OFF.

Btw, what is the default for this option in Fedora, on or off? If the
default is on, how to turn it off in the cleanest possible way?

HTH, :-)
Marko


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