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List:       linux-lvm
Subject:    Re: [linux-lvm] LVM cache/dm-cache questions.
From:       Sergei Franco <sergei.franco () gmail ! com>
Date:       2016-06-20 21:34:41
Message-ID: CAKpgpNhCm3cMmpGBpiruF_0+s_n3NfkbjOH1EGHh91WnT=9Mgw () mail ! gmail ! com
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Thank you!

That clears up a few questions!


Regards.

Sergei.

On 21 June 2016 at 04:27, Brassow Jonathan <jbrassow@redhat.com> wrote:
> 
> > On Jun 11, 2016, at 7:36 PM, sergei <sergei.franco@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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