On Tue, May 31, 2016 at 07:00:22PM +0800, 陈宗志 wrote: > can we change the existing file's extent size? > No, you can only set extent hint size for empty files, or, more precisely for files whose does not have allocated extents > On Tue, May 31, 2016 at 11:10 AM, Dave Chinner <[1]david@xxxxxxxxxxxxx> > wrote: > > On Tue, May 31, 2016 at 10:43:36AM +0800, 陈宗志 wrote: > > I have fint the way to change the extent size hint > > mkfs.xfs -r extsize=40960 /dev/sda1 > Ah, no, that isn't the extsize I'm refering to. That's for realtime > device configuration at mkfs, not a per-inode extent size hint. > When you create the image file do this: > $ xfs_io -f -c "extsize 1m" /path/to/new/vm_image > $ qemu-image create -f qcow2 /path/to/new/vm_image 10g > $ xfs_io -c extsize /path/to/new/vm_image > [1048576] /path/to/new/vm_image > $ > And now the qcow2 image file will have extents allocated in > multiples of 1MB. > > Cheers, > Dave. > -- > Dave Chinner > [2]david@xxxxxxxxxxxxx > > -- > --- > Blog: [3]http://www.chenzongzhi.info > Twitter: [4]https://twitter.com/baotiao > Git: [5]https://github.com/baotiao > > References > > 1. mailto:david@xxxxxxxxxxxxx > 2. mailto:david@xxxxxxxxxxxxx > 3. http://www.chenzongzhi.info/ > 4. https://twitter.com/#!/baotiao > 5. https://github.com/baotiao > _______________________________________________ > xfs mailing list > xfs@xxxxxxxxxxx > http://oss.sgi.com/mailman/listinfo/xfs -- Carlos _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
