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.

Linux and UNIX Man Pages

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Linux 2.6 - man page for zero (linux section 4)

NULL(4) 						     Linux Programmer's Manual							   NULL(4)

null, zero - data sink
Data written to the /dev/null and /dev/zero special files is discarded. Reads from /dev/null always return end of file (i.e., read(2) returns 0), whereas reads from /dev/zero always return bytes containing zero ('\0' characters). These devices are typically created by: mknod -m 666 /dev/null c 1 3 mknod -m 666 /dev/zero c 1 5 chown root:root /dev/null /dev/zero
/dev/null /dev/zero
If these devices are not writable and readable for all users, many programs will act strangely. Since Linux 2.6.31, reads from /dev/zero are interruptible by signals. (This change was made to help with bad latencies for large reads from /dev/zero.)
chown(1), mknod(1), full(4) Linux 2015-07-23 NULL(4)

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