3 Replies Latest reply on Dec 4, 2019 6:40 AM by Great_White_Tec

    vSAN Help

    SAMitch Lurker

      Help please!


      I was given a short notice tasking to setup 3 new hosts all SSD with vCenter and vSAN.  I have some esxi experience but NO vSAN experience.


      For each host do I need to setup a RAID on the first two drives for the OS and leave the other 14 drives for vSAN, or do I install on the first drive and vSAN takes care of resiliency of the OS as well as data?




        • 1. Re: vSAN Help
          TheBobkin Virtuoso
          vExpertVMware Employees

          Hello SAMitch


          Welcome to Communities and vSAN.


          What are you trying to configure the ESXi install on? Two SSDs in a RAID1? SD-cards/BOSS are a more probable install location, are these not available?

          vSAN can only consume drives to make Disk-Groups that have no partitions on them - this is configured when creating the Disk-Groups on each node.

          Create a Disk Group on a vSAN Host


          If you are considering using SSDs in a RAID configuration for boot then please ensure these are not on the same controller as the vSAN disks as it is not supported to mix modes

          VMware Knowledge Base


          Edit: No - vSAN doesn't do anything with the ESXi 'OS' device, this is unrelated to vSAN.



          • 2. Re: vSAN Help
            SAMitch Lurker

            Hi Bob


            Thanks for the reply.


            No SD or BOSS. 3 Dell R940 and are currently raw.  Nothing installed anywhere.  I have 16 SSD's per server and only one controller per server.  So it looks like I cant do a RAID for the OS as I would have a mixed mode on the only controller.


            What would be the best approach?

            • 3. Re: vSAN Help
              Great_White_Tec Expert
              VMware EmployeesvExpert

              Hi SAMitch,


              The boss card will allow you to have 2 M.2 devices that can be mirrored for the OS. This approach allows for redundancy, does not use the controller(s) for vSAN, does not take drive slots away, AND it also allows you to have logs locally as opposed to SD card where you will need to ship the logs out.


              Also, You stated that you have 16 drives but only 1 controller. This will most likely be a hurdle as many controllers do not support that many devices. For example, the Dell HBA330 supports up to 8 devices. It is also recommended the you have 2 or more controllers for redundancy and performance. We also recommend to use HBA over PERC Controllers as we don't need the PERC capabilities and HBAs are way cheaper. You can probably buy 2 HBAs for the price of 1 PERC Controller.


              HBA330 12Gbps SAS HBA Controller (NON-RAID), MiniCard | Dell USA


              Dell EMC Boot Optimized Server Storage-S1 User's Guide


              Hope this helps