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It's not bug, it's normal behavior.
File system generaly do not say to device that this block now free and can be cleare, so LUN ( array) must store all information that was writen on it.
Some FS can do it. For this use SCSI UNMAP commands. Example of this FS: ext4, NTFS ( from WIN2008 R2).
Latest revision of Vmware.
Comstar have this features under ZFS
I can't find information that Oracle introduce this features.
Edited by: Nik on 16.05.2012 11:46