Storage not claimed after freeing devices.

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Thanks for your question about reclaiming free space. This article may help. https://dell.to/3DKSR0X

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Instructions
There are three types of Allocated tracks

1. Unwritten Allocated Tracks --> Thin Pool space that is preallocated / allocated to a TDEV, but contains no      host written data (Basically unused storage within a thin pool, this can be done using the command below.)
    symdev -sid1234  allocate -devs XXX:XX
                                          a. Unwritten Allocated Tracks with Persistent flag
                                          b. Non-Persistent Unwritten Allocated Tracks.

2. Zero Based Allocated Tracks --> All the extents / Tracks on the TDEV contain zeros (Tracks can contain        zeros due to filesystem or database formatting methods depending on the underlying platform)
                                        a. Persistent
                                        b. Non-Persistent.

3. Written Allocated Tracks --> Tracks containing host written data. (e.g. Files, Databases etc)

1a. can be restored to the thin pool using reclaim -persistent command 
1b. can either be restored using free or reclaim command

2a. can be restored to the thin pool using reclaim -persistent command 
2b. can be restored to the thin pool using reclaim command  

3. Written tracks can only be restored using free -all command.(The device must be not mapped or Not Ready)

Note: Free -all command can be used with all three scenarios , basically it will clear the allocated tracks whether it has written data or unwritten or zero written tracks,  Please use this command carefully.

Note: only deleting the files on a partition /FS will remove the pointers to the data, but data is available and not marked as 0 based thus reclaim or free without -all option will not restore that, in Linux Systems we can run a fstrim command to reclaim space after deleting the Files on the partition (fstrim command will discard any unused tracks/blocks )

Note: space reclamation process is non-disruptive and can be executed while the targeted thin device is fully available to operating systems and applications.