[CentOS] LVM and thin snapshots


hunter86_bg at yahoo.com
Fri Sep 27 11:23:34 UTC 2019

Hi ,

You can also check if BOOM boot manager can work with thin LVM.

I really like that feature, since CentOS7.x

Best Regards,
Strahil NikolovOn Sep 27, 2019 12:39, Georgios <gpdsbe+centos at mailbox.org> wrote:
> Hi there! 
> Im new here. 
> Im trying to install Centos 8 on my laptop. I also want to have a 
> contingency plan in case something brakes. 
> My first thoughts were to use LVM. 
> The idea is that i would take multiple snapshots of the system during 
> the day/week and will keep them for a short time. 
> I read RHEL documentation about how lvm works and pretty much understand 
> how to manage the above scenario with LVM snapshots and encryption. 
> If i understood lvm snapshots will cause delay the system after multiple 
> snapshots.  The best way to avoid it is using thin snapshots. 
> At rhel documentation it says that is possible for a non thin volume to 
> get a thin snapshots. 
> [Correct me if my above assumptions are wrong or if there is a better 
> solution for my purpose.] 
> So i created a group with 3 volumes groups and one thin pool. 
> Im trying to take a snapshot and i get the message. 
> "Cannot use writable LV as the external origin." 
> I read somewhere that i should change it to read only and then take a 
> snapshot. Although that would be a problem i just try it to see if it 
> works. Then i got the message 
> "Cannot use active LV for the external origin" 
> Any ideas??? 
> Thanks in advance 
> Georgios 
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