[ClusterLabs] SBD with shared block storage (and watchdog?)

[emmanuel segura]

I missed that, the same device for partition and sbd :(, really bad idea.

2017-02-13 19:04 GMT+01:00 Klaus Wenninger <kwenning at redhat.com>:
> On 02/13/2017 06:34 PM, durwin at mgtsciences.com wrote:
>> I am working to get an active/active cluster running.
>> I have Windows 10 running 2 Fedora 25 Virtualbox VMs.
>> VMs named node1, and node2.
>>
>> I created a vdi disk and set it to shared.
>> I formatted it to gfs2 with this command.
>>
>> mkfs.gfs2 -t msicluster:msigfs2 -j 2 /dev/sdb1
>>
>> After installing 'dlm' and insuring guest additions were
>> installed, I was able to mount the gfs2 parition.
>>
>> I then followed.
>>
>> https://github.com/l-mb/sbd/blob/master/man/sbd.8.pod
>>
>> I used this command.
>>
>> sbd -d /dev/sdb1 create
>
> To be honest I have no experience with using a partition for
> a filesystem and sbd in parallel.
> I would guess that you have to tell the filesystem at least to
> reserve some space for sbd.
> For the first experience I would go for a separate
> partition for sbd.
>
>>
>>
>> Using sbd to 'list' returns nothing, but 'dump' shows this.
>
> Did you point list to /dev/sdb1 as well?
> (sbd list -d /dev/sdb1)
> Still it might return nothing as you haven't used
> any of the slot you created by now.
> You can try to add one manually though.
> (sbd allocate test -d /dev/sdb1)
>
>>
>>
>> fc25> sbd -d /dev/sdb1 dump
>> ==Dumping header on disk /dev/sdb1
>> Header version     : 2.1
>> UUID               : 6094f0f4-2a07-47db-b4f7-6d478464d56a
>> Number of slots    : 255
>> Sector size        : 512
>> Timeout (watchdog) : 5
>> Timeout (allocate) : 2
>> Timeout (loop)     : 1
>> Timeout (msgwait)  : 10
>> ==Header on disk /dev/sdb1 is dumped
>>
>> I then tried the 'watch' command and journalctl shows error listed.
>>
>> sbd -d /dev/sdb1 -W -P watch
>>
>> Feb 13 09:54:09 node1 sbd[6908]:    error: watchdog_init: Cannot open
>> watchdog device '/dev/watchdog': No such file or directory (2)
>> Feb 13 09:54:09 node1 sbd[6908]:  warning: cleanup_servant_by_pid:
>> Servant for pcmk (pid: 6910) has terminated
>> Feb 13 09:54:09 node1 sbd[6908]:  warning: cleanup_servant_by_pid:
>> Servant for /dev/sdb1 (pid: 6909) has terminated
>>
>
> well, to be expected if the kernel doesn't see a watchdog device ...
>
>>
>> From
>>
>> http://blog.clusterlabs.org/blog/2015/sbd-fun-and-profit
>>
>> I installed watchdog.
>>
>> my /etc/sysconfig/sbd is.
>>
>> SBD_DELAY_START=no
>> SBD_OPTS=
>> SBD_PACEMAKER=yes
>> SBD_STARTMODE=clean
>> SBD_WATCHDOG_DEV=/dev/watchdog
>> SBD_WATCHDOG_TIMEOUT=5
>>
>> the sbd-fun-and-profit says to use this command.
>>
>> virsh edit vmnode
>
> You would do that on the host if you were running linux as host-os
> and you were using libvirt to control virtualization.
> Haven't played with VirtualBox and watchdog-devices. But probably
> it is possible to have one or it is there by default already.
> You best go to the graphical guest definition and search amongst
> the to be added devices.
> Don't know if it is a virtual version of something that exists in physical
> world so that the linux kernel is expected to have a driver for it or
> if the driver comes with the guest additions.
> Otherwise you can go for softdog of course - but be aware that this
> won't take you out if the kernel is hanging.
>
> Regards,
> Klaus
>
>>
>>
>> But there is no vmnode and no instructions on how to create it.
>>
>> Is anyone able to piece together the missing steps?
>>
>>
>> Thank you.
>>
>> Durwin F. De La Rue
>> Management Sciences, Inc.
>> 6022 Constitution Ave. NE
>> Albuquerque, NM  87110
>> Phone (505) 255-8611
>>
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