Support for SCSI disks is only available for ESX-based grids.
When building a new appliance to use SCSI disks on a mixed grid (mixture of Xen and ESX servers), the virtualization mode for the appliance must specify vmware as the preferred virtualization mode.
An appliance that is configured to use SCSI disks will not start in HVM mode on a Xen grid. This is due to a limitation in Xen.
Appliance may not use a mixture of IDE and SCSI disks; it must use all SCSI disks or all IDE disks.
If an appliance descriptor contains /dev/sda and /dev/sdc, the devices will appear as /dev/sda and /dev/sdb inside the appliance.
When building a Windows appliance using SCSI disks on ESX, the apk_volume may appear as offline instead of being auto-mounted. This can be fixed by going to Computer Management > Storage > Disk Management, right-click the disk and click Online.
CD-ROM devices are attached as IDE devices regardless of whether they are specified as IDE or SCSI. If a Windows appliance is configured to use SCSI disks and a CD-ROM disk is configured, the APK auto-mounting feature may not work and should be disabled for the Windows appliances that use SCSI disks and have a CD-ROM disk configured.
