How to convert IDE disks to SCSI | Nutanix Community
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Nutanix best practices dictate that regular disk drives are configured on the SCSI bus, and CD-ROM drives are configured on the IDE bus. While regular disk drives can be configured on the IDE bus, it is possible that performance degradation may be observed on the drive due to the low queue depth on IDE controller.

To avoid performance impact conversion of IDE to SCSI can be performed.

:exclamation: Prior to modifying the IDE disk, take a local snapshot of the Guest VM, in case a roll-back is needed.

:exclamation: It is strongly recommended that the VMs are powered off before performing the conversion.

  • Convert the disk by cloning the IDE disk and attaching it to the SCSI bus.
  • It is recommended to remove the old IDE disk after the cloned SCSI disk is created and validated.

To help you identify any non CD-ROM IDE VM disks Nutanix has included NCC check uvm_ide_disk_check into NCC software package. This check is not scheduled to run on an interval and it does not generate an alert.

Further on conversion steps, pre-requisites and the NCC check itself please follow through to KB-2998 NCC Health Check: uvm_ide_disk_check

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