[ClusterLabs] Removing DRBD w/out Data Loss?

[Eric Robinson]

That's great information! We will give it a try on a test server first.

> -----Original Message-----
> From: Users <users-bounces at clusterlabs.org> On Behalf Of Valentin Vidic
> Sent: Tuesday, September 8, 2020 10:10 AM
> To: users at clusterlabs.org
> Subject: Re: [ClusterLabs] Removing DRBD w/out Data Loss?
>
> On Tue, Sep 08, 2020 at 02:33:37PM +0000, Eric Robinson wrote:
> > I checked the DRBD manual for this, but didn't see an answer. We need to
> convert a DRBD cluster node into standalone server and remove DRBD
> without losing the data. Is that possible? I asked on the DRBD list but it didn't
> get much of a response.
> >
> > Given:
> >
> > The backing device is logical volume: /dev/vg1/lv1
> >
> > The drbd volume is: drbd0
> >
> > The filesystem is ext4 on /dev/drbd0
> >
> > Since the filesystem is built on /dev/drbd0, not on /dev/vg1/lv1, if we
> remove drbd from the stack, how do we get access the data?
>
> After stopping DRBD, wipefs /dev/vg1/lv1 should list the signatures on the
> device. Removing *only* the DRBD signature will give a filesystem accessible
> directly on /dev/vg1/lv1. Make sure to use the --backup option.
>
> --
> Valentin
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