Github user sureshanaparti commented on the issue: https://github.com/apache/cloudstack/pull/1953 Changes in the PR #2019. Maximum data volumes supported field, in the _hypervisor_capabilities_ table, should be the attachable data volumes to the VM. This excludes the ROOT disk and CD-ROM. So, the hypervisor has to support max devices = maximum data volumes supported + 2 (ROOT and CD-ROM). 0(zero) index is considered in `getDeviceId()` for ROOT disk as the ROOT disk attach cmd uses this method. This has to be refactored.
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