Kernel 3.11 and Fedora 19...

[Reindl Harald]

Am 07.09.2013 16:04, schrieb Marko Vojinovic:
> On Sat, 7 Sep 2013 09:20:29 -0300
> Fernando Cassia <fcassia at gmail.com> wrote:
> 
>> On Sat, Sep 7, 2013 at 9:16 AM, Heinz Diehl <htd at fritha.org> 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?

how could this feature turned on at default?
if you think about it you know it's impossible
why? because that would mean using a *random??* SSD as cache for *what* devices?

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