On Wed, 10 Oct 2012, Gregory Farnum wrote: > I don't know the ext4 internals at all, but filesystems tend to > require allocation tables of various sorts (for managing extents, > etc). 7.5GB out of 500GB seems a little large for that metadata, but > isn't ridiculously so... ext3/4 are particularly bad about this, with lots of space statically set aside for inodes and allocation metadata. s > > On Wed, Oct 10, 2012 at 10:28 AM, Damien Churchill <damoxc@xxxxxxxxx> wrote: > > On 10 October 2012 18:10, Travis Rhoden <trhoden@xxxxxxxxx> wrote: > >> Additionally, 500G - 7.5G != 467G (the number shown as Avail). Why > >> the huge discrepancy? I don't expect the numbers to add up exact due > >> to rounding from kB, MB, GB, etc, but they should be darn close, a la > > > > ext4 keeps some reserved space, 5% by default, for when the disk is > > full so you are still able to use the filesystem and clean it up. > > > > 500G * 0.05 = 25G > > 500G - (25G + 7.5G) = 467G > > > > Can't tell you where the 7.5G comes from though! > > -- > > To unsubscribe from this list: send the line "unsubscribe ceph-devel" in > > the body of a message to majordomo@xxxxxxxxxxxxxxx > > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- > To unsubscribe from this list: send the line "unsubscribe ceph-devel" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > > -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
