This section provides a list of software and hardware configuration restrictions that apply to Sun Cluster HA for WebSphere MQ Integrator only.
Your data service configuration might not be supported if you do not observe these restrictions.
For restrictions that apply to all data services, see the Sun Cluster Release Notes.
The Sun Cluster HA for WebSphere MQ Integrator data service can be configured only as a failover service – Sun Cluster cannot operate as a scalable service and therefore, the Sun Cluster HA for WebSphere MQ Integrator data service can be configured only to run as a failover service.
Installing Sun Cluster onto Cluster File Systems – Initially, you install the Sun Cluster product into /opt/mqs and /var/mqsi.
You must mount /var/mqsi as a Global File System with a symbolic link for /var/mqsi/locks to a Local File System. It is recommended that /opt/mqsi be on a local disk. For a discussion of the advantages and disadvantages of installing the software on local versus cluster file system, see “Determining the Location of the Application Binaries” on page 3 of the Sun Cluster Data Services Installation and Configuration Guide
Mount /var/mqsi as a Global File System – Sun Cluster uses several directories within /var/mqsi, which needs to be available on all nodes within Sun Cluster as a Global File System. Generated locks must be located within a Local File System. Because of this, you must setup /var/mqsi/locks as a symbolic link to a Local File System.
It is best practice to mount Global File Systems with the /global prefix and to mount Failover File Systems with the /local prefix.
The following example shows Sun Cluster with /var/mqsi mounted as a Global File System through a symbolic link to /global/mqsi, with /var/mqsi/locks setup as a symbolic link to /var/mqsi_locks on the root file system, that is, local disk.
# ls -l /var/mqsi lrwxrwxrwx 1 root other 12 Sep 5 15:32 /var/mqsi -> /global/mqsi # # ls -l /global/mqsi/locks lrwxrwxrwx 1 root other 15 Sep 18 15:37 /global/mqsi/locks -> /var/mqsi_locks # # df -k /global/mqsi/locks Filesystem kbytes used avail capacity Mounted on /dev/dsk/c0t0d0s0 12731708 5792269 6812122 46% / # # more /etc/vfstab (Subset of the output) /dev/md/dg_d6/dsk/d60 /dev/md/dg_d6/rdsk/d60 /global/mqsi ufs 4 yes logging,global
The Sun Cluster HA for WebSphere MQ Integrator RDBMS – The Sun Cluster HA for WebSphere MQ Integrator data service can operate only with a local RDBMS, i.e. not a remote RDBMS and more specifically, only with DB2 and Oracle.
This restriction is because the Sun Cluster HA for WebSphere MQ Integrator data service needs to manage the restart scenarios for Sun Cluster, whenever the RDBMS restarts.