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Re: [dm-devel] How to use dm-cache-target?



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



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