2.2.4.2 Partitioning System Disks

When Solaris 2.6 or Solaris 7 is installed, the system disk is partitioned into slices for root (/), /usr, and other standard file systems. You must change the partition configuration to meet the requirements of Sun Cluster and your volume manager. Use the guidelines in the following sections to allocate disk space accordingly.

File System Slices

Table 2-1 shows the slice number, contents, and suggested space allocation for file systems, swap space, and slices. These values are used as the default when you install Solaris with JumpStart^TM, but they are not required by Sun Cluster.

Volume Manager Slices

Additionally, if you will be using Solstice DiskSuite, you must set aside a 10 Mbyte slice on the system disk for metadevice state database replicas. See the Solstice DiskSuite documentation for more information about replicas.

If you will be using SSVM or CVM, you must set aside two partitions and a small amount of free space (1024 sectors) on each multihosted disk that is to be managed by SSVM or CVM, for the disk group rootdg. The free space should be located at the beginning or end of each disk and should not be allocated to any slice. Refer to "2.2.5.2 Sun StorEdge Volume Manager and Cluster Volume Manager Considerations", for more information.

The Root (/) Slice

The root (/) slice on your local disk must have enough space for the various files and directories as well as space for the device inodes in /devices and symbolic links in /dev.

The root slice also must be large enough to hold the following:

• Solaris system software

• Sun Cluster, some components from your volume management software, and any third party software packages

• Data space for symbolic links in /dev for the disk units and for volume manager use

Sun Cluster uses various shell scripts that run as root processes. For this reason, the /.cshrc* and /.profile files for user root should be empty or non-existent on the cluster nodes.

Your cluster might require a larger root file system if it contains large numbers of disk drives.

If you run out of free space, you must reinstall the operating environment on all cluster nodes to obtain additional free space in the root slice. Make sure at least 20 percent of the total space on the root slice is left free.

The /usr, /var, and /opt Slices

The /usr slice holds the user file system. The /var slice holds the system log files. The /opt slice holds the Sun Cluster and data service software packages. See the Solaris Advanced Installation Guide for details about changing the allocation values as Solaris is installed.