This section describes the range of support of PRIMECLUSTER in a NIFCLOUD environment.
Number of cluster nodes: 1 to 2 nodes
Operation mode of the cluster system: 1:1 Standby operation, Mutual standby, Single-node cluster, Scalable operation (only when using Symfoware Server (Native) Hot Standby feature)
Network configurations
The servers in the cluster system must communicate with the API endpoints. This setting is not necessary in a single-node cluster.
Configurations to take over volume data
Data takeover by the mirroring among servers of GDS using the expanded disk function
Error of a zone (cluster system in multiple zones)
The cyclic monitoring of the cluster interconnect detects an error of a zone, and the node becomes LEFTCLUSTER.
Error of the public LAN
The network monitoring using ICMP detects a route failure, and the service is automatically switched to the standby system.
Error of the guest OS
The cyclic monitoring of the cluster interconnect detects an error of the guest OS, and the service is automatically switched to the standby system.
Error of the cluster interconnect
The cyclic monitoring of the cluster interconnect detects an error of the cluster interconnect, and the service is switched or cut off.
Error of the disk access
GDS monitors I/O to a disk, and when an error of the disk access occurs, the disk is detached and the service continues.
If an I/O error occurs in all slices in a mirror, the service is automatically switched to the standby system.
Error of the cluster application
When a resource error of the cluster application occurs, the service is automatically switched to the standby system.
Note
Acquiring the backup to the server is recommended when OS is stopped.
The following functions for PRIMECLUSTER are not available:
GFS
GLS
GDS Snapshot
Root class and local class of GDS
Single volume of GDS, and disk groups of GDS other than the netmirror type (mirror, stripe, concatenation, and switch)
Easy Design and Configuration Feature
In addition to the above functions, the functions of GDS for PRIMECLUSTER are not available in a single-node cluster.
Among the functions of NIFCLOUD. the following functions are not available.
Live migration
VM import
Auto scale
Internet VPN (H/W)
Red Hat Enterprise Linux 6 ELS (Extended Life-cycle Support)
NAS
Dedicated component
Private region
If the additional NIC function is used, the server copy function cannot be used.
In the cluster system in multiple zones, use the private bridge function for a cluster communication between zones.
In the cluster system in a single zone, use the server separateness function of NIFCLOUD so that each server starts on a different physical host.
In the cluster system in a single zone, it is recommended to use the unit separation function of an expanded disk.
In a NIFCLOUD environment, when an OS panic occurs, the cluster node may be powered off while the memory dump is being output, and it may not be possible to collect a complete memory dump.
