On Mon, Mar 29, 2010 at 09:48:50AM -0500, Eric Sandeen wrote: > CaT wrote: > > Using kernel 2.6.33.1. Am rsyncing from /data/mirror (a raid0 mount) to > > /dev/sda1 (a usb HD). Both filesystems formatted as ext3 but mounted as > > ext4. /mnt filesystem is only being added to and currently large files > > (iso files 700MB-4.4GB) are being copied. When I remounted /mnt as ext3 > > I could not duplicate the issue and the amount of disk used stabilised > > at 182G. The df results, whilst /mnt is mounted as ext4, are below: > > I would say this is likely speculative allocation due to delalloc > (ext4 has to reserve worst-case metadata amounts to prepare for > delalloc writeback). When the file data actually gets written out, > the worst-case reservation is freed up again. We also flush and > switch to nodelalloc when the filesystem is pretty close to full. > see ext4_nonda_switch() for example. > > This looks pretty severe though, more than I would expect > from that behavior. This is fixed in commit d330a5bef, which which got merged post 2.6.34-rc2, and which we need to get into 2.6.33 stable. If you cherry-pick that commit, I think you'll see that it fixes this problem. - Ted -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
