Chapter 4. Multinode hardware configurations 201 Partition-related information (such as merge timeout definition) Chassis information for serial and UUID checksum Scalability port informationThe BMC firmware discovers scalable systems automatically, to check forchanges at the scalability port connections, adding new systems and anychanges at any existing system in this complex. This is all done by the attachedscalability cables. The BMC reads all the Complex Descriptors and keeps theinformation consistent in all the BMC.The BMC monitors the Complex Descriptors information in the complex. Achange in the Complex Descriptor information, which always holds informationabout the state of all systems and partitions, presents a red alert in the RSA IIScalability Management menu Web interface if an error occurs. It also indicatesstatic errors, which is a problem of a particular system, or the cabling at ascalability port, shown in Figure 4-24 on page 224.4.4 Prerequisites to create a multinode complexThis section describes what to consider before you can create a multinodecomplex. Before you configure a scalability partition, be aware of the followingprerequisites: A scalable system must have a scalability hardware enabler key, also knownas the ScaleXpander chip, installed into the x3850 M2 and x3950 M2. Thisprovides the capability to scale the system, or add to an existing multinodeNote: The BMC in each system discovers and keeps consistent complex andpartition information of all nodes in a complex. This allows the RSA2 in anysystem in a complex to manage the all of the partitioning.Note: In the case of any unexpected behavior, which can result in anunexpected reboot of the whole partition, but can be recovered after a reboot,it is not reported in the RSA II Scalability Management menu. There you cansee static errors only, that affect any system in a partition or the complex.To isolate the failure, we recommend that you check the system eventinformation in the RSA II Web interface on all connected nodes.See Figure 4-31 on page 238.
