In the GFS Shared File System, monitoring daemons such as sfcfrmd, sfcprmd, sfcfsd, sfchnsd, and sfcpncd monitor the cluster state. The monitoring daemons also ensure that only a single primary MDS is running on a given cluster at one time, so file system access is consistent on all nodes.
If the state of some of the nodes in the cluster cannot be confirmed due to a cluster partition error, the node that is operating the primary MDS cannot be determined because a quorum does not exist. In this case, the GFS Shared File System services suspended startup of the sfcfrmd daemon, in order to ensure data consistency.
There are two available sfcfrmd daemon's startup modes following:
wait
When a node is started up, the startup of the sfcfrmd daemon will be suspended until a cluster quorum exists, and also startup of nodes will be suspended at the same time.
And, when the CF is started up by the GUI, the startup of the sfcfrmd daemon is given up if a quorum does not exist.
wait_bg
When a node is started up or the CF is started up by the GUI, the startup of the sfcfrmd daemon will be suspended in the background until it can confirm that a cluster quorum exists. Node startup or CF startup will continue.
When the value is omitted (When initializing management partition), the default is "wait".
If the GFS Shared File System is used for cluster applications, please choose wait.
If the GFS Shared File System is not used for cluster applications, you can choose wait_bg. In this case, the cluster applications will be started without waiting for the GFS Shared File System become usable. Also, the time required for system startup can be reduced.
Note
If you start some of the nodes after stopping all the nodes in the cluster, the state of nodes that are not operated in a cluster system cannot be confirmed. So, the startup of the sfcfrmd daemon is suspended until all nodes are operated in a cluster system.
If wait is set and you want to start up CF by the GUI after stopping CF on all the nodes, see "12.6 How to start up CF by the GUI when a GFS Shared File System is used."
Information
When a node's startup is suspended, you can login to system using the network.
