[linux-lvm] LVM cache/dm-cache questions.

[lejeczek]

question I'd like to ask is: how to LUKS encrypt cache pool LV ?

many thanks.
L.

On 20/06/16 17:27, Brassow Jonathan wrote:
>> On Jun 11, 2016, at 7:36 PM, sergei <sergei.franco at gmail.com> wrote:
>>
>> Hi,
>>
>> I have a few simple questions regarding relatively new feature LVM cache/dm-cache.
>>
>>  From second hand information on internet, it appears that you cannot resize cached volume.
>> Please correct me if I am wrong: to resize a cached volume, one needs to lvremove the cache, resize and recreate the cache?
> This is true at the moment.  You are likely to be able to simply resize online in the future.
>
>> In scenario where cache device fails, how safe is the data on the cached LVM?
> If you are using writethrough, quite safe.  If you are using ‘writeback’, probably not (RAID for your cache in this case would probably be wise).
>
>> Is it possible to make snapshots of the cached device?
> easy answer is “no”.
>
> complicated answer includes a ‘yes’.  You can cache a poolDataLV, then your thinLV and all its thinSnaps would be cached.
>
>   brassow
>
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