multipathd failed to get udev uid / failed to get sysfs uid / - how to disable

this error come very often in /var/log/syslog:
ov 18 15:38:08 cloud multipathd[763]: sda: add missing path
Nov 18 15:38:08 cloud multipathd[763]: sda: failed to get udev uid: Invalid argument
Nov 18 15:38:08 cloud multipathd[763]: sda: failed to get sysfs uid: Invalid argument
Nov 18 15:38:08 cloud multipathd[763]: sda: failed to get sgio uid: No such file or director

>> how to disable:
add a blacklist section to file:
/etc/multipath.conf
defaults {
user_friendly_names yes
}
blacklist {
devnode "^(ram|raw|loop|fd|md|dm-|sr|scd|st|sda)[0-9]*"
}

don't forget to restart the service: /etc/init.d/multipath-tools restart

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