Unable to write to the repository storage

I have 3 sites of SourceOne , the two remote sites Message center are located locally per each site , the main site Message Center data volume is huge , the Disk Space where the message center is configured get full and activity jobs fail, below are logs from Event log and the Activity log:

Reason: Unable to write to the repository storage. (0x86040F2A) (-2046554326)                 Source: Not assigned.

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Disk space low: current = 5%, target > 20%, on \\Server01\s1mc$\Message_Center. (0x86042763) [ExAsArchive.exe, ExAsArchivePoll.cpp(1645).CExAsArchivePoll::CheckDiskFreeSpace]

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System call failed. (0x86040100) The system call level is not correct.  (0x8007007C) [SOFileArchiveJBC, ExDirectoryThread.cpp(6425).CExDirectoryThread::Run]

Any idea how to make Message center clean up the transmitted message to archive ?

Regards ,,

Ahmad