[ovirt-users] ovirt with glusterfs - big test - unwanted results

[paf1 at email.cz]

Hello Yaniv,

we tried another small test - reboot two nodes from replica3 a1 ( 
1HP12-R3A1P1 ) which keep master domain.
All domains went down  = master down, but master domain didn't move to 
another available domain ( eg. 2HP12-R3A1P1 ).

It looks that "master domain" management isn't correct ( has a bug ?? )

regs.
Pavel


On 31.3.2016 14:30, Yaniv Kaul wrote:
> Hi Pavel,
>
> Thanks for the report. Can you begin with a more accurate description 
> of your environment?
> Begin with host, oVirt and Gluster versions. Then continue with the 
> exact setup (what are 'A', 'B', 'C' - domains? Volumes? What is the 
> mapping between domains and volumes?).
>
> Are there any logs you can share with us?
>
> I'm sure with more information, we'd be happy to look at the issue.
> Y.
>
>
> On Thu, Mar 31, 2016 at 3:09 PM, paf1 at email.cz <mailto:paf1 at email.cz> 
> <paf1 at email.cz <mailto:paf1 at email.cz>> wrote:
>
>     Hello,
>     we tried the  following test - with unwanted results
>
>     input:
>     5 node gluster
>     A = replica 3 with arbiter 1 ( node1+node2+arbiter on node 5 )
>     B = replica 3 with arbiter 1 ( node3+node4+arbiter on node 5 )
>     C = distributed replica 3 arbiter 1  ( node1+node2, node3+node4,
>     each arbiter on node 5)
>     node 5 has only arbiter replica ( 4x )
>
>     TEST:
>     1)  directly reboot one node - OK ( is not important which ( data
>     node or arbiter node ))
>     2)  directly reboot two nodes - OK ( if  nodes are not from the
>     same replica )
>     3)  directly reboot three nodes - yes, this is the main problem
>     and a questions ....
>         - rebooted all three nodes from replica "B"  ( not so
>     possible, but who knows ... )
>         - all VMs with data on this replica was paused ( no data
>     access ) - OK
>         - all VMs running on replica "B" nodes lost (  started
>     manually, later )( datas on other replicas ) - acceptable
>     BUT
>         - !!! all oVIrt domains went down !! - master domain is on
>     replica "A" which lost only one member from three !!!
>         so we are not expecting that all domain will go down,
>     especially master with 2 live members.
>
>     Results:
>         - the whole cluster unreachable until at all domains up -
>     depent of all nodes up !!!
>         - all paused VMs started back - OK
>         - rest of all VMs rebooted and runnig - OK
>
>     Questions:
>         1) why all domains down if master domain ( on replica "A" )
>     has two runnig members ( 2 of 3 )  ??
>         2) how to fix that colaps without waiting to all nodes up ? (
>     in worste case if node has HW error eg. ) ??
>         3) which oVirt  cluster  policy  can prevent that situation ??
>     ( if any )
>
>     regs.
>     Pavel
>
>
>
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