On the assumption that you are using an old version of Ghost and not the very latest, there are all sorts of driver and hardware issues that might be causing your grief.
First of all, please note that Ghost is NOT a backup solution - it is an imaging solution first and foremost. For critical data, you should always use a product that is designed for data backup and may offer a lot more resilience than ghost in the event that a backup image gets corrupted. When ghost images get corrupted, there is basically zero chance of recovering data. Given the generally low cost of hard disks, it might be cleaner and cheaper overall just to store the hard disks from these server machines and put in brand new disks for whatever they will be used for next.
Otherwise, get some software specifically designed for data backup on servers (yes, there is a Symantec product that does the job - used to be called Backup Exec but pretty sure it has been renamed now).
The current version of Ghost relies entirely on WinPE as the boot environment, and even with the latest WinPE, there are no guarantees that RAID drivers will work correctly in a command line environment. However, at least Ghost now runs with 64 bit WinPE and you can therefore use 64 bit drivers which is what modern servers tend to come with.