This is a boolean that controls the handling of disk space allocation in the server. When this is set to yes the server will change from UNIX behaviour of not committing real disk storage blocks when a file is extended to the Windows behaviour of actually forcing the disk system to allocate real storage blocks when a file is created or extended to be a given size. In UNIX terminology this means that Samba will stop creating sparse files. This can be slow on some systems. When strict allocate is no the server does sparse disk block allocation when a file is extended. Setting this to yes can help Samba return out of quota messages on systems that are restricting the disk quota of users. no