Snapshots space question

[Joe Obernberger]

Hello all - I'm seeing a lot of disk usage by snapshots.  On this 
particular node /data/1/cassandra, and /data/2/cassandra are the mount 
points Cassandra is using for disk storage:

du -s -h /data/1/cassandra
211G    /data/1/cassandra
du -s -h /data/2/cassandra
343G    /data/2/cassandra
nodetool listsnapshots

Snapshot Details:
Snapshot name                             
Keyspace name Column family name True size  Size on disk
truncated-1613059667093-extractedmetadata doc          
extractedmetadata  6.46 GiB   9.62 GiB
truncated-1613171359910-datasources       doc          
datasources        5.35 KiB   6.34 KiB
truncated-1604519912217-extractedmetadata doc          
extractedmetadata  0 bytes    1.37 KiB
truncated-1613171349850-seq               
doc          seq                19.64 KiB  
20.53 KiB
truncated-1609811731202-ftametrics        doc          
ftametrics         2.25 MiB   2.25 MiB
truncated-1613399333453-datasources       doc          
datasources        10.64 KiB  11.66 KiB
truncated-1607634106229-ftametrics        doc          
ftametrics         260.83 KiB 262.22 KiB
truncated-1602601520243-events            system_traces 
events             445.59 KiB 445.68 KiB
truncated-1613059536491-binary_data       doc          
binary_data        8.42 GiB   8.42 GiB
truncated-1613399357140-seq               
doc          seq                9.83 KiB   
10.69 KiB
truncated-1602601654401-events            system_traces 
events             0 bytes    13 bytes
truncated-1602601536768-events            system_traces 
events             0 bytes    13 bytes
truncated-1605902489665-binary_data       doc          
binary_data        1.19 GiB   1.19 GiB
truncated-1602697810806-events            system_traces 
events             0 bytes    13 bytes
truncated-1613059547371-binary_docs       doc          
binary_docs        2.26 MiB   2.26 MiB
truncated-1605902490413-binary_docs       doc          
binary_docs        70.69 KiB  71.67 KiB
truncated-1609796926674-ftametrics        doc          
ftametrics         2.11 MiB   2.11 MiB

Total TrueDiskSpaceUsed: 16.09 GiB

Now I execute:
nodetool clearsnapshot

Disk usage dropped by 488G.�

du -s -h /data/1/cassandra
30G     /data/1/cassandra
du -s -h /data/2/cassandra
36G     /data/2/cassandra

Could there be something wrong with my setup (Cassandra 3.11.9).� Thanks!

-Joe


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