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    KVM VM Replication

    Scheduled Pinned Locked Moved IT Discussion
    kvmreplicationvirtualizationstoragehypervisorlinuxdrbdglustercephhyper-v
    31 Posts 11 Posters 8.4k Views
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    • FATeknollogeeF
      FATeknollogee
      last edited by

      Who amongst us is doing is currently doing KVM replication?

      scottalanmillerS 2 Replies Last reply Reply Quote 0
      • scottalanmillerS
        scottalanmiller @FATeknollogee
        last edited by

        @FATeknollogee said in KVM VM Replication:

        Who amongst us is doing is currently doing KVM replication?

        We do it with SCRIBE on our Scale HC3 system.

        1 Reply Last reply Reply Quote 0
        • scottalanmillerS
          scottalanmiller @FATeknollogee
          last edited by

          @FATeknollogee said in KVM VM Replication:

          KVM replication

          I think calling it this adds to the confusion. Hyper-V includes a product called Hyper-V Replication. This makes it seem like it is both a part of the hypervisor (it is not) and something we should be looking for as a feature (it is not.)

          No other platform has a thing called "platform replication". It's just not an appropriate concept. And Hyper-V only had it to overcome storage layer shortcomings that were pretty dramatic compared to the competition. And now in Hyper-V, you basically never use it because it's not a good idea, there are free add ons that make it essentially (but not absolutely totally) useless.

          In KVM, Xen, or ESXi we should simply be asking about replication strategies. How do you want to replicate, and why? How do you do that with your specific KVM? KVM is just the hypervisor and nothing else, but Hyper-V is the name for the entire ecosystem around a hypervisor. So asking about KVM as if it were similar doesn't make sense.

          If what you want to ask about is DRBD, ask about DRBD, not KVM. If you want to know about Gluster, ask about that. Asking about a storage feature concept, but only in the context of a non-storage system, will result in confusing and very limited answers.

          S 1 Reply Last reply Reply Quote 0
          • S
            StorageNinja Vendor @scottalanmiller
            last edited by

            @scottalanmiller said in KVM VM Replication:

            No other platform has a thing called "platform replication".

            vSphere Replication is most certainly a product/feature, and other ecosystem replication solutions out there like Recovery Point, RP4VM, Veeam Backup and Replication and Zerto. Couple things...

            1. DRDB is a kernel driver. There's positives (It's low overhead) but also negatives vs stuff like VAIO that loopback to userspace (if it borks it takes down the host). For async you don't want WAN backups or other issues to cause problems, and how you deal with resume from the replication being borked without having something like CBT or WAN acceleration can change hugely how the stuff is operationally managed.

            2. Compression/Deduplication/WAN efficiency. In theory I could run DRDB through a WAN optimizer, but this is a standard function in a number of replication products. If your on metered connections this can get expessive. (vSphere Replication uses LZFast for compression, Veeam lets you tune what compression you want etc). Honestly don't remember what compression Hyper-V uses other than that they do it.

            3. Encryption. A lot of other async replication products/features support TLS encryption at the transport layer for this connection. In theory you could IPSEC DRDB.

            4. Does the product support GFS retention of the async replica's? Can I keep snapshots on the other side and is merging them out to age out old ones a zero overhead operation.

            5. Application and guest quiescence etc tied to recovery points. What does management for this look like?

            6. Can I target 1 cluster to another cluster without having to manually pair hosts and volumes? (IE can I just target a resource pool etc on the other side, or am I manually deciding target hosts and volumes every time).

            Some other nice to have's is something that manages orchestration of testing, failover, failback with full runbooks, replication of network firewall rules, handling BGP failover, network overlay stuff etc.

            Saying "It's cool DRDB can do async replication" may be TECHNICALLY true, but there's a rabbit whole of features people tend to look for with async replication

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            • Emad RE
              Emad R @brianlittlejohn
              last edited by

              @brianlittlejohn said in KVM VM Replication:

              I may be asking this prematurely, I'm about to start playing around with KVM. Is there a replication feature similar to HyperV replication baked into KVM natively?

              Many times we soo those questions, Perhaps if we can PIN KVM as topic as well as (pbx) freepbx some how

              scottalanmillerS 1 Reply Last reply Reply Quote 0
              • DustinB3403D
                DustinB3403
                last edited by

                @scottalanmiller tags please

                scottalanmillerS 1 Reply Last reply Reply Quote 0
                • scottalanmillerS
                  scottalanmiller @DustinB3403
                  last edited by

                  @DustinB3403 said in KVM VM Replication:

                  @scottalanmiller tags please

                  Tags added.

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                  • scottalanmillerS
                    scottalanmiller @Emad R
                    last edited by

                    @Emad-R said in KVM VM Replication:

                    @brianlittlejohn said in KVM VM Replication:

                    I may be asking this prematurely, I'm about to start playing around with KVM. Is there a replication feature similar to HyperV replication baked into KVM natively?

                    Many times we soo those questions, Perhaps if we can PIN KVM as topic as well as (pbx) freepbx some how

                    Not realistically. If we started pinning random topics, the topic list would turn into a handful of tagged topics and it would be very diffult to use the forum. This is such an obscure topic, we'd likely pin a hundred or more topics before this, imagine how hard it would be to use a forum with a few hundred pinned topics that you always saw. You'd never see anything else, nor could you find what you needed in the pinned list.

                    Just using the search is best.

                    JaredBuschJ 1 Reply Last reply Reply Quote 0
                    • JaredBuschJ
                      JaredBusch @scottalanmiller
                      last edited by

                      @scottalanmiller said in KVM VM Replication:

                      Just using the search is best

                      Tags.

                      scottalanmillerS 1 Reply Last reply Reply Quote 0
                      • scottalanmillerS
                        scottalanmiller @JaredBusch
                        last edited by

                        @JaredBusch said in KVM VM Replication:

                        @scottalanmiller said in KVM VM Replication:

                        Just using the search is best

                        Tags.

                        yeah, having tags on the topics makes them better than pinning.

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