seq 2 8 | parallel -t ssh root@parasilo-{} nodetool flush 
seq 2 8 | parallel -t ssh root@parasilo-{} systemctl stop cassandra 
seq 2 8 | parallel -t ssh root@parasilo-{} sync
seq 2 8 | xargs -t -n1 -i{} ssh root@parasilo-{} 'echo 3 >  /proc/sys/vm/drop_caches'
seq 2 8 | parallel -t  ssh root@parasilo-{} systemctl start cassandra