Figure 2-3 on page 22 shows a cluster including a quorum site with limited capacity. Figure 2-3 3 Site configuration with quorum site. The functions that can use quorum are noted in the following list: GLYPH<SM590000> Server-Time-Protocol (STP) can use a quorum (called Arbiter) to select the preferred time  server GLYPH<SM590000> A clustered file system (GPFS or Spectrum Scale) uses quorum to maintain data  consistency in the event of a node failure 2.1.6 System partition configuration The traditional method of configuring logical partitions and I/O on IBM LinuxONE uses the I/O  Definition File (IODF). In this book, we describe running the machine in IODF mode and  configuring the machine using IODFs. Note:  More detail about I/O configuration on IBM LinuxONE can be found in 3.2, “Machine  configuration on IBM LinuxONE” on page 55. A new partition management system, known as Dynamic Partition Manager (DPM), has been  introduced on IBM LinuxONE. DPM provides a complete interface for defining IBM LinuxONE  partitions, assigning resources to them, and starting and stopping them. DPM is designed to  require less upfront knowledge of the I/O configuration concepts than when using IODFs. DPM supports most IBM LinuxONE hardware, including OSA Express and FICON Express  adapters. At the time of this publication, DPM does not provide support for two important IBM LinuxONE  functions that are important to the reference architecture described in this book. These  functions are: Dynamic Partition Manager GLYPH<SM590000> FICON channel-to-channel (CTC) devices  GLYPH<SM590000> The LPAR to run a GDPS Virtual Appliance  22  Temenos on IBM LinuxONE Best Practices Guide