For _every_ file copied samba performs readdir() to get all entries of the destination folder. Then the list is searched for filename (to prevent name collisions as SMB shares are not case sensitive). More files in folder, more time it takes to perform readdir(). It is a lot worse for Gluster because single folder contents distributed among many servers and Gluster has to join many directory listings (requested via network) to form one and return it to caller. Rsync does not perform readdir(), it just checks file existence with stat() IIRC. And as modern Gluster versions has default setting to check for file only at its destination (when volume is balanced) - the check performs relatively fast. You can hack samba to prevent such checks if your goal is to get files copied not so slow (as you sure the files you are copying are not exists at destination). But try to perform 'ls -l' on _not_ cached folder with thousands of files - it will take tens of seconds. This is time your users will waste browsing shares.
-- Dmitry Glushenok Jet Infosystems |
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