Hello,
there is a problem with startup script in sentry-store package - startup sometimes fails, because pidfile is not created on background in time.
In my testing cluster I've used this crazy construct to wait (after setry startup command):
i=0
while ! test -f ${PIDFILE} -a $i -lt 100; do sleep 0.1; done
But simple 'sleep 1' could solve it too. :-)