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6.1.2 Operating System
6.1.2.4 update and fsflush
When a program makes a change to the file system it first writes to the in-core buffer in the kernel. The disk write normally occurs later, and is handled asynchronously. The user process continues without waiting for this to happen. The kernel initializes the program, update (SunOS 4.X, started by /etc/rc) or fsflush (SunOS 5.X, process 3), that periodically (the default is every 30 seconds) flushes the in-core memory buffers to the disk by calling the sync command. This helps to minimize damage in the event of a crash.
Unix System Administration - 8 AUG 1996
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