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    VMWARE to XCP-ng migration of 2TB disk

    Scheduled Pinned Locked Moved Migrate to XCP-ng
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    • C Offline
      CyaVMware
      last edited by

      Have a simple question for someone.

      Looking at migrating a client to XCP. Currently they have a data disk that is exactly 2TB in VMware.

      My question is the limitation anything OVER 2TB, or is it 2TB AND above?
      I'd prefer not to use the VMware converter tool to shrink the disk to 1.99TB if I don't have to. 🙂

      acebmxerA J 2 Replies Last reply Reply Quote 0
      • acebmxerA Online
        acebmxer @CyaVMware
        last edited by

        @CyaVMware

        Read this post - https://xcp-ng.org/forum/post/104698 Support is there but is in Release Candidate currently.

        1 Reply Last reply Reply Quote 0
        • J Offline
          john.c @CyaVMware
          last edited by john.c

          @CyaVMware said:

          Have a simple question for someone.

          Looking at migrating a client to XCP. Currently they have a data disk that is exactly 2TB in VMware.

          My question is the limitation anything OVER 2TB, or is it 2TB AND above?
          I'd prefer not to use the VMware converter tool to shrink the disk to 1.99TB if I don't have to. 🙂

          VHD format has a strict limit of roughly 2TB (around 2040 GB), so if your client’s VM disks are larger than this then you’re going to have trouble with VHD format. However QCOW2 support is almost here (production ready) about to reach RC2 state, once this reaches stable you’ll be able to safely reach a max of around 16TB. That is if your using ext4 based SR, other Filesystems have different limits. If using a networked file sharing protocol service then, the limit of the host server’s filesystem applies. Though QCOW2 VDI has a limit of 16 TiB.

          poddingueP 1 Reply Last reply Reply Quote 0
          • poddingueP Offline
            poddingue Vates đŸȘ @john.c
            last edited by

            Following up since the situation changed: QCOW2 went GA in XO 6.5 (released 2026-05-28), so the old ~2TB VHD ceiling is gone.
            A disk at exactly 2TB, and well beyond it, is fine now without shrinking to 1.99TB first. When acebmxer and john.c replied, it was still a release candidate; it's the stable story now. I haven't migrated a disk quite that size myself, so I won't promise it's totally painless, but the format limit that was blocking you isn't there anymore.
            The release blog has the details if you want to read up before the migration: https://xen-orchestra.com/blog/xen-orchestra-6-5/

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