Reason 1: Since the automounter is not active during an upgrade, the installation program installs any package's files or directories that are symbolic links to automounted file systems. If a symbolic link is overwritten, the upgrade might fail because of insufficient disk space.
Note -
The /var/mail and /var/news directories, which usually reside on an automounted file system, are not affected by an upgrade.
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Solution for Reason 1: During the upgrade, delete software packages that will create files or directories on the automounted file systems. Then the installation program does not overwrite the symbolic link with the files or directories in the package.
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Reason 2: New software has been added to the software group that you are upgrading or some of the existing software has increased in size. During an upgrade, the installation program installs any new software that is part of the software group previously installed on the system, and it also upgrades any existing packages on the system.
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Solution for Reason 2: During the upgrade, delete software packages that are installed in the file systems that need more space. Especially look for any new packages that have been added to the Solaris software that you don't need.
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