ceph-drop-caps.sh

#!/bin/bash

# random sleep to avoid thundering herd
sleep $[ ( $RANDOM % 30 )  + 1 ]s

if ls /sys/kernel/debug/ceph/*/caps 1> /dev/null 2>&1; then
  CAPS=`cat /sys/kernel/debug/ceph/*/caps | grep total | awk '{sum += $2} END {print sum}'`
else
  CAPS=0
fi

if [ "${CAPS}" -gt 10000 ]; then
    logger -t ceph-drop-caps "Dropping ${CAPS} caps..."
    echo 2 > /proc/sys/vm/drop_caches
    logger -t ceph-drop-caps "Done"
fi