10 Replies Latest reply on Apr 29, 2019 2:34 AM by sk84

    vSAN Leverage External Storage

    9990374530 Novice

      Hi Experts,

       

      In order to build VMware vSAN can SAN/NAS be leveraged in terms of the storage or it is mandate to use internal storage of the server?

       

      Regards

      PK

        • 1. Re: vSAN Leverage External Storage
          TheBobkin Virtuoso
          VMware EmployeesvExpert

          Hello PK,

           

           

          No, local storage only. You can of course attach SAN/NAS to it as well though.

           

           

          Bob

          1 person found this helpful
          • 2. Re: vSAN Leverage External Storage
            9990374530 Novice

            Hi Bob,

             

            Thanks for the reply.

            However, I have few queries as below and I hope it clarifies my confusion.

             

            • VSAN with 3 node cluster (Using Local Storage Only), we can't add SAN/NAS to existing 3 node cluster, right?
            • Can we use SAN/NAS in HCI environment? If yes, will it behave as per vSAN algorithm? I need to understand what if I have my existing HCI environment with vSAN 3 node cluster and I am trying to leverage external storage as well. How does it work?
            • I am sure we can also leverage cloud storage for vSAN?

             

            Regards

            PK

            • 3. Re: vSAN Leverage External Storage
              TheBobkin Virtuoso
              vExpertVMware Employees

              Hello PK,

               

               

              "we can't add SAN/NAS to existing 3 node cluster, right?"

              You can attach the external storage to it as you would attach storage to any ESXi node, however it will not becomes a part of vsanDatastore

               

              "Can we use SAN/NAS in HCI environment? If yes, will it behave as per vSAN algorithm?"

              You can use it but it will just be a regular datastore, not a vsanDatastore and everything that entails.

               

              "I am trying to leverage external storage as well. How does it work?"

              It works exactly the same as a normal non-vSAN ESXi with external storage attached does.

               

              "I am sure we can also leverage cloud storage for vSAN?"

              Yes there are some providers whose cloud offerings are backed by vSAN.

               

               

              Bob

              • 4. Re: vSAN Leverage External Storage
                9990374530 Novice

                Hey Bob,

                 

                Thanks a lot for all your help!

                I would request you to please share any documentations/videos (where these scenarios has been explained) or Demos(Where I can practice).

                 

                 

                Regards

                PK

                • 5. Re: vSAN Leverage External Storage
                  TheBobkin Virtuoso
                  vExpertVMware Employees

                  Hello PK,

                   

                   

                  Synopsis of vSAN nodes with attached non-vSAN storage:

                  vSAN and Traditional Storage

                   

                  VMware Hands On Labs - great free resource for test-driving different VMware products including vSAN:

                  VMware Learning Platform

                   

                  Compendium of easily-digested vSAN material sorted by numerous categories:

                  VMware vSAN | VMware

                   

                   

                  Bob

                  1 person found this helpful
                  • 6. Re: vSAN Leverage External Storage
                    9990374530 Novice

                    Hi Bob,

                     

                    Appreciate you Support

                     

                    Regards

                    PK

                    • 7. Re: vSAN Leverage External Storage
                      9990374530 Novice

                      Hi Bob,

                       

                      Just to know more about below query:

                      "we can't add SAN/NAS to existing 3 node cluster, right?"

                      You can attach the external storage to it as you would attach storage to any ESXi node, however it will not becomes a part of vsanDatastore

                       

                      Please let me now if below example is correct or not.

                      I have 3 node ESXI node cluster with vSAN datastore (HCI Environment).

                       

                      We can add external SAN/NAS to the same esxi nodes but this will not be apart of existing vSAN datastore cluster, Right?

                      Moreover, please let me know if the same esxi nodes with vSAN datastore and external storage can be managed by same Vcenter Management Console?

                      vSAN is object based storage, Is there any role of iSCSI target in vSAN datastores?

                       

                      "iSCSI target services uses LUNs to enable an initiator on a remote host to transport block-level data to a storage device in the vSAN cluster".

                       

                      Regards

                      PK

                      • 8. Re: vSAN Leverage External Storage
                        sk84 Expert
                        vExpert

                        We can add external SAN/NAS to the same esxi nodes but this will not be apart of existing vSAN datastore cluster, Right?

                        Yes, that's also what Bob wrote.

                         

                        Moreover, please let me know if the same esxi nodes with vSAN datastore and external storage can be managed by same Vcenter Management Console?

                        Yes. From traditional storage side, nothing changes. It's exactly the same as without vSAN. At the end you will have at least 2 datastores. One is vSAN backed and the other is a regular iSCSI, NFS, FC or local datastore as you know it without vSAN.

                         

                        vSAN is object based storage, Is there any role of iSCSI target in vSAN datastores?

                        Basically iSCSI is not required for the setup and operation of vSAN and it doesn't use the iSCSI protocol for internal communication. However, you can configure vSAN as iSCSI target and use vSAN as data storage on other systems outside the vSAN cluster. But ESXi is not supported as initiator. That means, you can't connect a vSAN datastore from ESXi cluster A to ESXi cluster B. Instead you could connect a vSAN datastore to a physical server with Windows or Linux as OS via iSCSI.

                        • 9. Re: vSAN Leverage External Storage
                          9990374530 Novice

                          Hi Sebastian,

                           

                          Thanks for your response!

                          However, in regard to vSAN iSCSI protocol, I would like to highlight few lines as mentioned in document below. Need to know if this statement is correct.

                           

                          "vSAN does not behave like traditional storage volumes based on LUNs or NFS shares. The iSCSI target service uses LUNs to enable an initiator on a remote host to transport block-level data to a storage device in the vSAN cluster".

                           

                          vSAN and Traditional Storage

                           

                           

                          Regards

                          Pravesh Kaushal

                          • 10. Re: vSAN Leverage External Storage
                            sk84 Expert
                            vExpert

                            Yes, vSAN must provide a LUN otherwise iSCSI wouldn't work.