[ClusterLabs] DRBD + VDO HowTo?

Sun May 16 17:32:10 EDT 2021

Okay, it turns out I was wrong. I thought I had it working, but I keep running into problems. Sometimes when I demote a DRBD resource on Node A and promote it on Node B, and I try to mount the filesystem, the system complains that it cannot read the superblock. But when I move the DRBD primary back to Node A, the file system is mountable again. Also, I have problems with filesystems not mounting because the vdo devices are not present. All kinds of issues.

From: Users <users-bounces at clusterlabs.org> On Behalf Of Eric Robinson
Sent: Friday, May 14, 2021 3:55 PM
To: Strahil Nikolov <hunter86_bg at yahoo.com>; Cluster Labs - All topics related to open-source clustering welcomed <users at clusterlabs.org>
Subject: Re: [ClusterLabs] DRBD + VDO HowTo?

Okay, I have it working now. The default systemd service definitions did not work, so I created my own.

From: Strahil Nikolov <hunter86_bg at yahoo.com<mailto:hunter86_bg at yahoo.com>>
Sent: Friday, May 14, 2021 3:41 AM
To: Eric Robinson <eric.robinson at psmnv.com<mailto:eric.robinson at psmnv.com>>; Cluster Labs - All topics related to open-source clustering welcomed <users at clusterlabs.org<mailto:users at clusterlabs.org>>
Subject: RE: [ClusterLabs] DRBD + VDO HowTo?

There is no VDO RA according to my knowledge, but you can use systemd service as a resource.

Yet, the VDO service that comes with thr OS is a generic one and controlls all VDOs - so you need to create your own vdo service.

Best Regards,
Strahil Nikolov
On Fri, May 14, 2021 at 6:55, Eric Robinson
<eric.robinson at psmnv.com<mailto:eric.robinson at psmnv.com>> wrote:

I created the VDO volumes fine on the drbd devices, formatted them as xfs filesystems, created cluster filesystem resources, and the cluster us using them. But the cluster won’t fail over. Is there a VDO cluster RA out there somewhere already?

From: Strahil Nikolov <hunter86_bg at yahoo.com<mailto:hunter86_bg at yahoo.com>>
Sent: Thursday, May 13, 2021 10:07 PM
To: Cluster Labs - All topics related to open-source clustering welcomed <users at clusterlabs.org<mailto:users at clusterlabs.org>>; Eric Robinson <eric.robinson at psmnv.com<mailto:eric.robinson at psmnv.com>>
Subject: Re: [ClusterLabs] DRBD + VDO HowTo?

For DRBD there is enough info, so let's focus on VDO.

There is a systemd service that starts all VDOs on the system. You can create the VDO once drbs is open for writes and then you can create your own systemd '.service' file which can be used as a cluster resource.

Best Regards,

Strahil Nikolov

On Fri, May 14, 2021 at 2:33, Eric Robinson

<eric.robinson at psmnv.com<mailto:eric.robinson at psmnv.com>> wrote:

Can anyone point to a document on how to use VDO de-duplication with DRBD? Linbit has a blog page about it, but it was last updated 6 years ago and the embedded links are dead.

https://linbit.com/blog/albireo-virtual-data-optimizer-vdo-on-drbd/

-Eric

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