Today (Saturday) We will make some minor tuning adjustments to MySQL.

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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FreeBSD 11.0 - man page for fsync (freebsd section 1)

FSYNC(1)						    BSD General Commands Manual 						  FSYNC(1)

NAME
fsync -- synchronize a file's in-core state with that on disk
SYNOPSIS
fsync file ...
DESCRIPTION
The fsync utility causes all the modified data and meta-data of all the files named on the command line to be written to a permanent storage device. The fsync utility uses the fsync(2) function call.
EXIT STATUS
If an error occurs, the fsync utility proceeds to the next file, and exits >0. Otherwise, it exits 0.
SEE ALSO
fsync(2), sync(2), syncer(4), halt(8), reboot(8)
HISTORY
The fsync command first appeared in FreeBSD 4.3.
BSD
January 25, 2005 BSD

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