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In the current version, you cannot change the cluster size once a file has been compressed. You must decompress the file first, and then compress it with the new cluster size.
If you change the compression algorithm for a compressed file, already-compressed clusters will not be recompressed with the new algorithm. If you want to do so, you should decompress the file before compressing it again with the new algorithm. An exception is made for the `none' algorithm: changing from `none' to some other algorithm results in the kernel attempting to compress all currently-uncompressed clusters. (Clusters already compressed with some other algorithm are left compressed in that algorithm.)
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