DOCUMENT ID: 1513-02 SYNOPSIS: Why does system hang during shutdown? OS RELEASE: Solaris 2.4 PRODUCT: OS KEYWORDS: shutdown init umount umountall SYMPTOMS: The shutdown command hangs DESCRIPTION: When the shutdown or the init command is given the system does not come to the OK prompt. It hangs for a very long time. Why? SOLUTION: Solaris 2.4 introduced a parallel umount command. The command umount -a will try to unmount all the file systems except a few important ones. See man page of umount(1m) for more info. When you have many file systems to unmount they all try to go in parallel. This causes a deadlock for a kernel resource and hence the hang. Workaround: To solve the problem add the following to the /etc/system file. Set ksyms:nksyms_clones = { 30 + the number of file systems that you have} DATE APPROVED: 09/05/95