Hi Christian, > $ stat -c %o data/blob > 2097152 ... > **tar** does not explicitly use the block size of the file system > where the files are located, but, for a reason I don't know (feel free > to educate me), 10 KiB:
Historic, that being 20 blocks where a block is 512 B. See `Blocking Factor'. https://www.gnu.org/software/tar/manual/tar.html#SEC160 It can be changed. $ strace -e write -s 10 tar cbf 4096 foo.tar foo write(3, "foo\0\0\0\0\0\0\0"..., 2097152) = 2097152 +++ exited with 0 +++ $ > I would like to propose to use the native file system block size in > favor of the currently used 10 KiB. I can't see the default changing. POSIX's pax(1) states for ustar format that the default for character devices is 10 KiB, and allows for multiples of 512 up to an including 32,256. So you're suggesting the default is to produce an incompatible tar file. -- Cheers, Ralph. https://plus.google.com/+RalphCorderoy
