If your cluster units include hard disks, all cluster units must have identical hard disk configurations. This means each cluster unit must have same number of hard disks (including AMC and FortiGate Storage Module (FSM) hard disks) and also means that matching hard disks in each cluster unit must be the same size, have the same hard disk format, and have the same number of partitions.

In most cases the default hard disk configuration of the cluster units will be compatible. However, a hard disk formatted by an older FortiGate firmware version may not be compatible with a hard disk formatted by a more recent firmware version. Problems may also arise if you have used the execute scsi-dev command to add or change hard disk protections.

If a cluster unit CLI displays hard disk compatibility messages, you may need to use the execute scsi-dev delete command to delete partitions. You can also use the execute formatlogdisk command to reformat hard disks. In some cases after deleting all partitions and reformatting the hard disks, you may still see hard disk incompatibility messages. If this happens, contact Fortinet Customer Support for assistance.