The value n is the number of InterJob Communication (IJC) devices. Each device corresponds to one InterJob Communication buffer of the size defined by ijcbuff. For details, see the “Interprocess Communication” chapter in the Caché I/O Device Guide.
0–256 devices. InterSystems recommends you use the default of 16 devices.
On the page System Administration > Configuration > Additional Settings > Advanced Memory, in the ijcnum row, select Edit. Enter a number of devices.