[DRBD-user] how to restore lvm snapshot?

[Paul O'Rorke]

Hi d tbsky,

I don't know what others do, I just do essentially what you said, but 
without stopping the DRBD service.  I simply restore the snapshot to the 
primary DRBD block device, not the backing device and let DRBD do it's 
magic in the background.

I have done this for a Windows file server as well as a variety of Linux 
servers and haven't had an issue yet.

Having said that, I think others recommend stopping DRBD and restoring 
to the backing device, then forcing a sync with

drbdadm secondary <resource>
drbdadm connect --discard-my-data <resource>

You will find others on here with a deeper understanding of this.  Take 
their advice over mine if in doubt, and test, test, test...

*Paul O'Rorke*
*Tracker Software Products (Canada) Limited *
www.tracker-software.com <http://www.tracker-software.com/>
Tel: +1 (250) 324 1621
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On 2020-01-26 7:59 a.m., d tbsky wrote:
> Hi:
>      I have some windows vm running on top of drbd, and drbd on top of
> lvm. I want to install dotnet 4.8 on these vm. the patch can not be
> uninstalled and may destroy  the system. so I want to make snapshot of
> lvm and restore the snapshot if necessary. I wonder what to do at drbd
> layer when lvm snapshot got restored. I think the safe steps like
> below:
>
> 1. disconnect secondary and abandon the content
> 2. stop primary drbd service
> 3. restore primary lvm snapshot
> 4. start primary drbd service and connect secondary to re-sync from primary
>
> but I wonder if there are faster ways?
> 1. do we need to stop drbd service before restore lvm snapshot?
> 2. can we let drbd know we revert to some previous state and re-sync
> only necessary data?
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