MySQL io_setup() failed with EAGAIN after 5 attempts

60-mysql-aio-max-nr.conf

# MySQL Server startup fails when the InnoDB storage engine attempts to
# allocate more resources for asynchronous IO than are available on the
# host system.
#
#  [MY-012582] [InnoDB] io_setup() failed with EAGAIN. Will make 5 attempts before giving up.
#  <snip>
#  [MY-012583] [InnoDB] io_setup() attempt 5.
#  [MY-012584] [InnoDB] io_setup() failed with EAGAIN after 5 attempts.
#  [MY-012587] [InnoDB] You can disable Linux Native AIO by setting innodb_use_native_aio = 0 in my.cnf
#  [MY-012954] [InnoDB] Cannot initialize AIO sub-system
#
# The number of aio requests required by MySQL Server is currently calculated using 
# the formula:
#   256 * (innodb_read_io_threads + innodb_write_io_threads + 2) + 100
#
# With default values (ie. 4) for innodb-read- and innodb-write_io_threads
# this would mean that the MySQL Server requires 256 * (4 + 4 + 2 ) + 100 =>
# 2660 aio resources.
#
# The default value for Linux Native AIO resources (i.e the max-aio-nr) is
# set to a moderately low value on most distros (for example Ubuntu uses 65536).
#   $ cat /proc/sys/fs/aio-max-nr 
#   65536
# To check currently in use asynchrounous IO resources, use:
#   $ cat /proc/sys/fs/aio-nr
#   18497
#
# When running several MySQL Server instances or other programs making use of
# asynchronous IO resources it will thus be necessary to increase the default
# values of the host system. Running 32 MySQL Server instances with default
# values would require increasing max-aio-nr to at least 32* 2660 => 85120.
#
# On Ubuntu this can be done by placing this file in the /etc/sysctl.d/ directory,
# then either reboot or reload the sysctl settings with:
#  $ sudo service procps restart

fs.aio-max-nr = 340480