[ClusterLabs] Removing DRBD w/out Data Loss?

[Eric Robinson]

Valentin --

When I ran wipefs with DRBD stopped, it only showed one signature...

[root at 001db01 ~] # wipefs /dev/vg0/lv0
offset               type
----------------------------------------------------------------
0x438                ext4   [filesystem]
                     UUID:  2035aabe-b6e1-4313-a022-9518eb7489e6


So I just mounted the filesystem....

[root at 001db01 network-scripts]# wipefs /dev/vg_under_drbd0/lv_under_drbd0
offset               type
----------------------------------------------------------------
0x438                ext4   [filesystem]
                     UUID:  2035aabe-b6e1-4313-a022-9518eb7489e6
> -----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
> _______________________________________________
> Manage your subscription:
> https://lists.clusterlabs.org/mailman/listinfo/users
>
> ClusterLabs home: https://www.clusterlabs.org/
Disclaimer : This email and any files transmitted with it are confidential and intended solely for intended recipients. If you are not the named addressee you should not disseminate, distribute, copy or alter this email. Any views or opinions presented in this email are solely those of the author and might not represent those of Physician Select Management. Warning: Although Physician Select Management has taken reasonable precautions to ensure no viruses are present in this email, the company cannot accept responsibility for any loss or damage arising from the use of this email or attachments.