vSAN1

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  • 1.  in vSAN environment, do we still need use HA or DRS? Why?

    Posted Jan 07, 2022 02:20 PM

    i am not so familiar with vSAN. 

    in vSAN environment, do we still need use HA or DRS? Why?

    Another question is , for a vSAN clustter of PFTT=1, how many VMDK copies exists  for a guest VM? assuming guest VM on host1, does only host 2 and 3 have a VMDK file of the guest VM? or all there hosts have?

    Thanks



  • 2.  RE: in vSAN environment, do we still need use HA or DRS? Why?

    Posted Jan 07, 2022 05:41 PM

     For HA, yes, assuming you want your VMs to get automatically restarted in the event of a host failure. Same for DRS, if you want automated balancing of VMs compute resources across the hosts then it should be enabled - the only thing different from any regular vSphere cluster is that SDRS doesn't apply to vsanDatastore.

     

    A VM with FTT=1 policy applied to it only sees 1 vmdk per 'Hard Disk' but the Object backing this has 2 replicas + a witness-component distributed across all 3 hosts (e.g. 1 component on each).



  • 3.  RE: in vSAN environment, do we still need use HA or DRS? Why?

    Posted Jan 11, 2022 07:40 AM

    I think Bobkin explained it right, but just to simplify things:

    vSphere DRS = Load balances compute

    vSphere HA = Provides recovery for failures for compute

    vSAN = Distributed Storage Platform

    So the three features focus on a different area of your environment.