Re: How to use dm-cache-target?

[Zdenek Kabelac <zkabelac@redhat.com>]

Dne 11.3.2013 18:04, Darrick J. Wong napsal(a):
> On Mon, Mar 11, 2013 at 10:31:53AM +0000, thornber@redhat.com wrote:
>> On Mon, Mar 11, 2013 at 10:28:07AM +0800, majianpeng wrote:
>>> Hi all,
>>>      I am trying to use dm-cache-target on raid5.But i met a question.
>>>
>>>   Supposed: /dev/sdb1(5GB) is metadata; /dev/sdb2(20GB) is cache;/dev/md0 is raid5.
>>>
>>> 1:sutup my_cache
>>> dmsetup create my_cache --table '0 41943040 cache /dev/sdb1 /dev/sdb2 /dev/md0 131072 1 writethrough default 0'
>>
>> 41943040 - This is 20G, you should use the size of /dev/md0 in sectors
>>
>> Also I think your block size is way too big, try 2048 rather tha 131072.
>>
>>> BTW, for dm-cache is it support plug-and-play?
>>
>> No idea what you mean.
>
> I suspect the poster's asking if dmcaches will automatically reassemble
> themselves.
>
> I've been wondering myself what's the status of the lvm-tools integration? :)
>

On-going - will be integrated within some months.

Zdenek