vSAN1

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  • 1.  Question about Virtual SAN Partition

    Broadcom Employee
    Posted Jul 24, 2015 03:39 AM

    We know that Virtual SAN can handle partition scenario for single component. But what does it handle multi components scenario?

    For example:

    VM1 has 3 components - Home/VMDK1/VMDK2 on a 4 nodes Virtual SAN cluster.

    If the cluster split 2 partitions which 2 nodes due to multicast problem. Home and VMDK2 reside on partition 1 and VMDK1 reside on partition 2.

    What does HA do on this scenario? In my test environment, the VM1 can not start. Is it reasonable?

    Thanks.



  • 2.  RE: Question about Virtual SAN Partition

    Posted Jul 24, 2015 11:52 AM

    It depends on vSAN 5.5 or vSAN 6.  This is how it's handled in 6, VSAN 6.0 Part 1 - New quorum mechanism - CormacHogan.com

    In your case, your essentially created a failure of 2 nodes and a 4 node cluster can only have a max failure of 1 with rebuild space.

    Thank you, Zach.



  • 3.  RE: Question about Virtual SAN Partition

    Broadcom Employee
    Posted Jul 24, 2015 05:02 PM

    It's Virtual SAN 6 cluster.

    Actually we have 6 nodes, the cluster split 2 partitions. Each partition has 3 nodes.

    We can found that the cluster had been split to 2 cluster. Each cluster has their own master node.

    We have 60 testing VMs on this cluster. Some of them report component missing. If the components were stored in 2 partitions. The VM can not be started.

    Wanly



  • 4.  RE: Question about Virtual SAN Partition

    Posted Jul 25, 2015 08:44 PM

    Why did it get split into two partitions?

    I'll stick with my original answer.  Split like that is essentially a 3 host failure and with 6 nodes, the most FTT you can have is 2.  Thank you, Zach.