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You may experience 2 up to 10 seconds "glitch time" when we restart MySQL. We expect to make these adjustments around 1AM Eastern Daylight Saving Time (EDT) US.

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OpenSolaris 2009.06 - man page for fdatasync (opensolaris section 3c)

fdatasync(3C)						   Standard C Library Functions 					     fdatasync(3C)

fdatasync - synchronize a file's data
#include <unistd.h> int fdatasync(int fildes);
The fdatasync() function forces all currently queued I/O operations associated with the file indicated by file descriptor fildes to the synchronized I/O completion state. The functionality is as described for fsync(3C) (with the symbol _XOPEN_REALTIME defined), with the exception that all I/O operations are completed as defined for synchronised I/O data integrity completion.
If successful, the fdatasync() function returns 0. Otherwise, the function returns -1 and sets errno to indicate the error. If the fdata- sync() function fails, outstanding I/O operations are not guaranteed to have been completed.
The fdatasync() function will fail if: EBADF The fildes argument is not a valid file descriptor open for writing. EINVAL The system does not support synchronized I/O for this file. ENOSYS The function fdatasync() is not supported by the system. In the event that any of the queued I/O operations fail, fdatasync() returns the error conditions defined for read(2) and write(2).
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Committed | +-----------------------------+-----------------------------+ |MT-Level |Async-Signal-Safe | +-----------------------------+-----------------------------+ |Standard |See standards(5). | +-----------------------------+-----------------------------+
fcntl(2), open(2), read(2), write(2), fsync(3C), aio_fsync(3C), fcntl.h(3HEAD), attributes(5), standards(5) SunOS 5.11 5 Feb 2008 fdatasync(3C)

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