[dm-devel] Status dm-cache

[Rolf Fokkens]

Thanks.

I'll defer integrating dm-cache in Fedora until LVM2 supports it.

Rolf

On 08/27/2013 12:33 PM, Zdenek Kabelac wrote:
> Dne 25.8.2013 23:46, Rolf Fokkens napsal(a):
>> Hi!
>>
>> I'm trying to package some tools for "SSD caching" for Fedora 20, see:
>> https://bugzilla.redhat.com/show_bug.cgi?id=998543
>>
>> bcache has some nice bcache-tools, and packaging progresses well:
>> https://bugzilla.redhat.com/show_bug.cgi?id=999690
>>
>> Packaging dm-cache however seems seems hard. I'm not aware of any 
>> userland
>> tools, and using dm-cache (without them) seems quite complex. Looks 
>> like all
>> kinds of math are needed to make it work, e.g. :
>> http://blog.kylemanna.com/linux/2013/06/30/ssd-caching-using-dmcache-tutorial/. 
>>
>> - Is there a (well supported) toolset available that I'm missing?
>> - Is there any kind of autodetect possible, e.g. during boot?
>>
>> Any information on the status of dm-cache is appreciated.
>
>
> For direct usage of dm-cache target:
>
> linux/Documentation/device-mapper/cache.txt
> linux/Documentation/device-mapper/cache-policies.txt
>
> Userland tool here is  dmsetup.
>
> There will be a direct support for dm cache device stacking in lvm2 in 
> the future. It will use nearly the same code as is used for thin 
> provisioning,
> so the code for now thinp is improved to handle recovery more 
> autonomously first before the caching support will be added.
>
> Zdenek
>
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