projection_storage total usage vs disk_storage/storage_usage

logc

Hi, can someone explain the difference in the used bytes totals when querying projection_storage vs. disk_storage or storage_usage?
disk_space_used_gb,disk_space_free_gb,disk_space_total_gb
9616,3035,12652
9616,3035,12652
vs. projection_storage
total_used_gb
8942

Why aren't 9616 and 8942 the same? Thanks in advance.

                    --projection_storage 
                    SELECT projection_name, 
                    SUM(used_bytes)/1024^3 AS total_used_GB 
                    FROM projection_storage 
                    group by 1;
                    --disk_storage or storage_usage
                    SELECT   
                             SUM(used_bytes)/(1024^3) AS disk_space_used_gb,
                             SUM((used_bytes+free_bytes)-used_bytes)/(1024^3) AS disk_space_free_gb,
                             SUM(used_bytes+free_bytes)/(1024^3) AS disk_space_total_gb
                    FROM     v_monitor.storage_usage
                    WHERE    filesystem = 'vertica'
                    union all
                    SELECT  
                             SUM(disk_space_used_mb)/1024 AS disk_space_used_gb,
                             SUM(disk_space_free_mb)/1024 AS disk_space_free_gb,
                             SUM((disk_space_used_mb+disk_space_free_mb)/1024) AS disk_space_total_gb
                    FROM     v_monitor.disk_storage
                    WHERE    storage_usage = 'DATA,TEMP'

[Deleted User]

Projection_storage is disk space used by Vertica ROS files and disk_storage is current state of disk ( all of which may not be used by ROS files)

logc

Got it, many thanks for the quick response.