[linux-lvm] LVM cache/dm-cache questions.
sergei.franco at gmail.com
Mon Jun 20 21:34:41 UTC 2016
That clears up a few questions!
On 21 June 2016 at 04:27, Brassow Jonathan <jbrassow at redhat.com> wrote:
>> On Jun 11, 2016, at 7:36 PM, sergei <sergei.franco at gmail.com> wrote:
>> 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.
> linux-lvm mailing list
> linux-lvm at redhat.com
> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
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