Am 03.05.2012 20:19, schrieb Stephan Wiesand: > On May 3, 2012, at 20:11 , Florian Philipp wrote: > >> Am 03.05.2012 20:01, schrieb aurfalien: >>> Hi all, >>> >>> I never really paid attention to this but a file on an NFS mount is >>> showing 64M in size, but when copying the file to a local drive, it >>> shows 2.5MB in size. >>> >>> My NFS server is hardware Raided with a volume stripe size of 128K >>> were the volume size is 20TB, my local disk is about 500GB. >>> >>> Is this due to my stripe size? >>> >>> Nuggets are appreciated. >>> >>> - aurf >> >> Is it a sparse file? What exact command did you use to calculate the >> file size? > > A sparse file will grow when copied, not shrink. > `cp` is clever enough to avoid this. Quoting the man page: By default, sparse SOURCE files are detected by a crude heuristic and the corresponding DEST file is made sparse as well. That is the behavior selected by --sparse=auto. The theory was that `du` over nfs might behave more like `du --apparent-size` locally.