tombstone - standalone compaction in cassandra -

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i new cassandra, plz excuse if find question not worthy.

i trying test behavior of cassandra(1.2.5) cluster, have set column ttl 1 day. after day able confirm data being not available, want verify standalone compaction happening , cleaning space occupied tombstones when using default tombstone_threshold i.e 20%.

so question - how make sure stand alone compaction happening? , there way know how size disk space freed in process. there logs reading compaction type , work done compaction?

if insert little data (im talking 5-10 rows) easy track whats going on via sstable2json tool gives 'raw' view of sstable stores. detailed statistics ks/cf use nodetool status can see each node's load. 

datacenter: datacenter1 ======================= status=up/down |/ state=normal/leaving/joining/moving --  address    load       tokens  owns (effective)  host id         rack un  127.0.0.1  90.87 kb   256     100.0%            a0a2...22ff     rack1

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