[linux-lvm] howto cache a thinpool-device?
Brassow Jonathan
jbrassow at redhat.com
Tue Aug 19 23:34:40 UTC 2014
If it was me, I would put the thinMetaLV directly on the fast device (because it is small) and I would cache the thinDataLV.
Remember that some of what you are doing is pretty cutting edge. I wouldn't yet use caching + thin in production yet.
Also, consider making your thin devices redundant (if they are not already via backend storage).
brassow
On Aug 9, 2014, at 11:26 AM, Oliver Rath wrote:
> Hi list,
>
> what now worked:
>
> - creating a cached data-lv
> - creating a non-cached meta-lv
> - converting data-lv to a thinpool-device with meta-lv as metadata
>
> what not: doing the same thing with a cached meta-lv. Does this make sense?
>
> Is the metadata already cached by lvm-logic? Do i have a cache thinpool
> (with non-cached metadata) with the used way?
>
> Tfh!
> Oliver
>
>
> Am 09.08.2014 um 15:43 schrieb Oliver Rath:
>> Hi list,
>>
>> Im playing around with the new cache options. Ive created a lvm-device
>> on my cache-disk named lvx-cache (vg is dmivg). Additionally Ive created
>> a thinpool-device named winthinpool.
>>
>> Now i wanted to use my cache-device to cache my thinpool-lvm, but this
>> doesnt work:
>>
>> ~# lvconvert --type cache --cachepool dmivg/lvx_cache dmivg/winthinpool
>> Can't cache thin-pool volume dmivg/winthinpool.
>>
>> isnt is possible to cache a thinpool-device?
>>
>> Tfh!
>> Oliver
>>
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>
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