> - check that device mapper target exists - otherwise no VDO is possible at all
> - check that backing store device is visible - otherwise no VDO is possible
> - and only then possibly call vdo tool to check actual status
>
Sorry, it is not clear to me what you mean by device mapper target. How would I
check for the existence of the device mapper target for vdo0?
> -----Original Message-----
> From: Users <users-boun...@clusterlabs.org> On Behalf Of Andrei
> Borzenkov
> Sent: Tuesday, May 18, 2021 12:22 AM
> To: users@clusterlabs.org
> Subject: Re: [ClusterLabs] DRBD + VDO HowTo?
>
> On 17.05.2021 21:28, Eric Robinson wrote:
> > Andrei --
> >
> > Sorry for the novels. Sometimes it is hard to tell whether people want all
> the configs, logs, and scripts first, or if they want a description of the
> problem
> and what one is trying to accomplish first. I'll send whatever you want. I am
> very eager to get to the bottom of this.
> >
> > I'll start with my custom LSB RA. I can send the Pacemaker config a bit
> > later.
> >
> > [root@ha09a init.d]# ll|grep vdo
> > lrwxrwxrwx. 1 root root 9 May 16 10:28 vdo0 -> vdo_multi
> > lrwxrwxrwx. 1 root root 9 May 16 10:28 vdo1 -> vdo_multi
> > -rwx------. 1 root root 3623 May 16 13:21 vdo_multi
> >
> > [root@ha09a init.d]# cat vdo_multi
> > #!/bin/bash
> >
> > #--custom script for managing vdo volumes
> >
> > #--functions
> > function isActivated() {
> > R=$(/usr/bin/vdo status -n $VOL 2>&1)
> > if [ $? -ne 0 ]; then
> > #--error occurred checking vdo status
> > echo "$VOL: an error occurred checking activation status on
> $MY_HOSTNAME"
> > return 1
> > fi
> > R=$(/usr/bin/vdo status -n $VOL|grep Activate|awk '{$1=$1};1'|cut
> > -d"
> " -f2)
> > echo "$R"
> > return 0
> > }
> >
> > function isOnline() {
> > R=$(/usr/bin/vdo status -n $VOL 2>&1)
> > if [ $? -ne 0 ]; then
> > #--error occurred checking vdo status
> > echo "$VOL: an error occurred checking activation status on
> $MY_HOSTNAME"
> > return 1
> > fi
> > R=$(/usr/bin/vdo status -n $VOL|grep "Index status"|awk
> '{$1=$1};1'|cut -d" " -f3)
> > echo "$R"
> > return 0
> > }
> >
> > #--vars
> > MY_HOSTNAME=$(hostname -s)
> >
> > #--get the volume name
> > VOL=$(basename $0)
> >
> > #--get the action
> > ACTION=$1
> >
> > #--take the requested action
> > case $ACTION in
> >
> > start)
> >
> > #--check current status
> > R=$(isOnline "$VOL")
> > if [ $? -ne 0 ]; then
> > echo "error occurred checking $VOL status on
> $MY_HOSTNAME"
> > exit 0
> > fi
> > if [ "$R" == "online" ]; then
> > echo "running on $MY_HOSTNAME"
> > exit 0 #--lsb: success
> > fi
> >
> > #--enter activation loop
> > ACTIVATED=no
> > TIMER=15
> > while [ $TIMER -ge 0 ]; do
> > R=$(isActivated "$VOL")
> > if [ "$R" == "enabled" ]; then
> > ACTIVATED=yes
> > break
> > fi
> > sleep 1
> > TIMER=$(( TIMER-1 ))
> > done
> > if [ "$ACTIVATED" == "no" ]; then
> > echo "$VOL: not activated on $MY_HOSTNAME"
> > exit 5 #--lsb: not running
> > fi
> >
> > #--enter start loop
> > /usr/bin/vdo start -n $VOL
> > ONLINE=no
> > TIMER=15
> > while [ $TIMER -ge 0 ]; do
> > R=$(isOnline "$VOL")
> > if [ "$R" == "online" ]; then
> > ONLINE=yes
> > break
> > fi
> > sleep 1
> > TIMER=$(( TIMER-1 ))
> > done
> > if [ "$ONLINE" == "yes" ]; then
> > echo "$VOL: started on $MY_HOSTNAME"
> > exit 0 #--lsb: success
> > else
> > echo "$VOL: not started on $MY_HOSTNAME (unknown
> problem)"
> > exit 0 #--lsb: unknown problem
> > fi
> > ;;
> > stop)
> >
> > #--check current status
> > R=$(isOnline "$VOL")
> > if [ $? -ne 0 ]; then
> > echo "error occurred checking $VOL status on
> $MY_HOSTNAME"
> > exit 0
> > fi
> >
> > if [ "$R" == "not" ]; then
> > echo "not started on $MY_HOSTNAME"
> > exit 0 #--lsb: success
> > fi
> >
> > #--enter stop loop
> > /usr/bin/vdo stop -n $VOL
> > ONLINE=yes
> > TIMER=15
> > while [ $TIMER -ge 0 ]; do
> > R=$(isOnline "$VOL")
> > if [ "$R" == "not" ]; then
> > ONLINE=no
> > break
> > fi
> > sleep 1
> > TIMER=$(( TIMER-1 ))
> > done
> > if [ "$ONLINE" == "no" ]; then
> > echo "$VOL: stopped on $MY_HOSTNAME"
> > exit 0 #--lsb:success
> > else
> > echo "$VOL: failed to stop on $MY_HOSTNAME (unknown
> problem)"
> > exit 0
> > fi
> > ;;
> > status)
> > R=$(isOnline "$VOL")
> > if [ $? -ne 0 ]; then
> > echo "error occurred checking $VOL status on
> $MY_HOSTNAME"
> > exit 5
> > fi
>
> Smoke test
>
> $ vdo status -n foo
> vdo: ERROR - VDO volume foo not found
> $ echo $?
> 7
> $
>
> And why pray is this an error? This quite clearly tells you that requested
> volume does not exist so it cannot be active.
>
> The task of monitor action is to return "active" or "not active". The only
> case
> where it is appropriate to return other error is when monitor action cannot
> reliably decide whether resource is active or not. It is not the case in my
> trivial
> example so error indication is wrong.
>
> As long as you intend to stick with standard vdo tool, "vdo list" seems to be
> more appropriate in monitor action. It gives you exactly "a list of started
> VDO
> volumes" which is what you are interested in.
>
> > if [ "$R" == "online" ]; then
> > echo "$VOL started on $MY_HOSTNAME"
> > exit 0 #--lsb: success
> > else
> > echo "$VOL not started on $MY_HOSTNAME"
> > exit 3 #--lsb: not running
> > fi
> > ;;
> >
>
> Are you sure it is the correct test in general? This reports whether
> deduplication is enabled or disabled. It is not the same as whether device is
> started. Device is started when corresponding device-mapper table is
> created. Deduplication may be enabled or disabled later without actually
> stopping it.
>
> But note that vdo *tool* is not really suitable for using in resource agent
> for
> at least two reasons
>
> - it relies on existing configuration files and does not really scan system
> for
> VDO devices. "VDO volume foo not found" really means "not found in
> configuration file". At the same time vdo tools accepts configuration file as
> argument. Which means VDO device may have been started using different
> configuration file already and your vdo invocation won't be aware of it. Also
> these configuration files are silently updated by vdo invocation which
> immediately means they may differ on cluster nodes.
>
> - it does not provide fine grained error indication to understand what
> happens.
>
> vdo resource agent would
>
> - check that device mapper target exists - otherwise no VDO is possible at all
> - check that backing store device is visible - otherwise no VDO is possible
> - and only then possibly call vdo tool to check actual status
>
> And may be it should use private configuration file and actually import VDO
> from device before starting
>
> > esac
> >
> >
> >
> >> -----Original Message-----
> >> From: Users <users-boun...@clusterlabs.org> On Behalf Of Andrei
> >> Borzenkov
> >> Sent: Monday, May 17, 2021 12:49 PM
> >> To: users@clusterlabs.org
> >> Subject: Re: [ClusterLabs] DRBD + VDO HowTo?
> >>
> >> On 17.05.2021 18:18, Eric Robinson wrote:
> >>> To Strahil and Klaus –
> >>>
> >>> I created the vdo devices using default parameters, so ‘auto’ mode
> >>> was
> >> selected by default. vdostatus shows that the current mode is async.
> >> The underlying drbd devices are running protocol C, so I assume that
> >> vdo should be changed to sync mode?
> >>>
> >>> The VDO service is disabled and is solely under the control of
> >>> Pacemaker,
> >> but I have been unable to get a resource agent to work reliably. I
> >> have two nodes. Under normal operation, Node A is primary for disk
> >> drbd0, and device
> >> vdo0 rides on top of that. Node B is primary for disk drbd1 and
> >> device vdo1 rides on top of that. In the event of a node failure, the
> >> vdo device and the underlying drbd disk should migrate to the other
> >> node, and then that node will be primary for both drbd disks and both vdo
> devices.
> >>>
> >>> The default systemd vdo service does not work because it uses the
> >>> –all flag
> >> and starts/stops all vdo devices. I noticed that there is also a
> >> vdo-start-by- dev.service, but there is no documentation on how to
> >> use it. I wrote my own vdo-by-dev system service, but that did not
> >> work reliably either. Then I noticed that there is already an OCF
> >> resource agent named vdo-vol, but that did not work either. I finally
> >> tried writing my own OCF-compliant RA, and then I tried writing an
> >> LSB-compliant script, but none of those worked very well.
> >>>
> >>
> >> You continue to write novels instead of simply showing your resource
> >> agent, your configuration and logs.
> >>
> >>> My big problem is that I don’t understand how Pacemaker uses the
> >> monitor action. Pacemaker would often fail vdo resources because the
> >> monitor action received an error when it ran on the standby node. For
> >> example, when Node A is primary for disk drbd1 and device vdo1,
> >> Pacemaker would fail device vdo1 because when it ran the monitor
> >> action on Node B, the RA reported an error. But OF COURSE it would
> >> report an error, because disk drbd1 is secondary on that node, and is
> >> therefore inaccessible to the vdo driver. I DON’T UNDERSTAND.
> >>>
> >>
> >> May be your definition of "error" does not match pacemaker definition
> >> of "error". It is hard to comment without seeing code.
> >>
> >>> -Eric
> >>>
> >>>
> >>>
> >>> From: Strahil Nikolov <hunter86...@yahoo.com>
> >>> Sent: Monday, May 17, 2021 5:09 AM
> >>> To: kwenn...@redhat.com; Klaus Wenninger <kwenn...@redhat.com>;
> >>> Cluster Labs - All topics related to open-source clustering welcomed
> >>> <users@clusterlabs.org>; Eric Robinson <eric.robin...@psmnv.com>
> >>> Subject: Re: [ClusterLabs] DRBD + VDO HowTo?
> >>>
> >>> Have you tried to set VDO in async mode ?
> >>>
> >>> Best Regards,
> >>> Strahil Nikolov
> >>> On Mon, May 17, 2021 at 8:57, Klaus Wenninger
> >>> <kwenn...@redhat.com<mailto:kwenn...@redhat.com>> wrote:
> >>> Did you try VDO in sync-mode for the case the flush-fua stuff isn't
> >>> working through the layers?
> >>> Did you check that VDO-service is disabled and solely under
> >>> pacemaker-control and that the dependencies are set correctly?
> >>>
> >>> Klaus
> >>>
> >>> On 5/17/21 6:17 AM, Eric Robinson wrote:
> >>>
> >>> Yes, DRBD is working fine.
> >>>
> >>>
> >>>
> >>> From: Strahil Nikolov
> >>> <hunter86...@yahoo.com><mailto:hunter86...@yahoo.com>
> >>> Sent: Sunday, May 16, 2021 6:06 PM
> >>> To: Eric Robinson
> >>> <eric.robin...@psmnv.com><mailto:eric.robin...@psmnv.com>;
> Cluster
> >>> Labs - All topics related to open-source clustering welcomed
> >>> <users@clusterlabs.org><mailto:users@clusterlabs.org>
> >>> Subject: RE: [ClusterLabs] DRBD + VDO HowTo?
> >>>
> >>>
> >>>
> >>> Are you sure that the DRBD is working properly ?
> >>>
> >>>
> >>>
> >>> Best Regards,
> >>>
> >>> Strahil Nikolov
> >>>
> >>> On Mon, May 17, 2021 at 0:32, Eric Robinson
> >>>
> >>> <eric.robin...@psmnv.com<mailto:eric.robin...@psmnv.com>>
> wrote:
> >>>
> >>> 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-boun...@clusterlabs.org<mailto:users-
> boun...@clusterlabs.org>
> >>> >
> >>> On Behalf Of Eric Robinson
> >>> Sent: Friday, May 14, 2021 3:55 PM
> >>> To: Strahil Nikolov
> >>> <hunter86...@yahoo.com<mailto:hunter86...@yahoo.com>>;
> Cluster
> >> Labs -
> >>> All topics related to open-source clustering welcomed
> >>> <users@clusterlabs.org<mailto:users@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...@yahoo.com<mailto:hunter86...@yahoo.com>>
> >>> Sent: Friday, May 14, 2021 3:41 AM
> >>> To: Eric Robinson
> >>> <eric.robin...@psmnv.com<mailto:eric.robin...@psmnv.com>>;
> Cluster
> >>> Labs - All topics related to open-source clustering welcomed
> >>> <users@clusterlabs.org<mailto:users@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.robin...@psmnv.com<mailto:eric.robin...@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...@yahoo.com<mailto:hunter86...@yahoo.com>>
> >>> Sent: Thursday, May 13, 2021 10:07 PM
> >>> To: Cluster Labs - All topics related to open-source clustering
> >>> welcomed <users@clusterlabs.org<mailto:users@clusterlabs.org>>; Eric
> >>> Robinson
> >> <eric.robin...@psmnv.com<mailto:eric.robin...@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.robin...@psmnv.com<mailto:eric.robin...@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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