On Wed, Jan 20, 2016 at 6:40 PM, Francois Lafont <flafdivers@xxxxxxx> wrote: > Hi, > > On 19/01/2016 07:24, Adam Tygart wrote: >> It appears that with --apparent-size, du adds the "size" of the >> directories to the total as well. On most filesystems this is the >> block size, or the amount of metadata space the directory is using. On >> CephFS, this size is fabricated to be the size sum of all sub-files. >> i.e. a cheap/free 'du -sh $folder' > > Ah ok, interesting. I have tested and I have noticed however that size > of a directory is not updated immediately. For instance, if I change > the size of the regular file in a directory (of cephfs) the size of the > size doesn't change immediately after. It's updated lazily so it's not instantaneous, but it should be pretty fast. Probably within 30 seconds, and usually a lot less. -Greg > >> $ stat /homes/mozes/tmp/sbatten >> File: '/homes/mozes/tmp/sbatten' >> Size: 138286 Blocks: 0 IO Block: 65536 directory >> Device: 0h/0d Inode: 1099523094368 Links: 1 >> Access: (0755/drwxr-xr-x) Uid: (163587/ mozes) Gid: (163587/mozes_users) >> Access: 2016-01-19 00:12:23.331201000 -0600 >> Modify: 2015-10-14 13:38:01.098843320 -0500 >> Change: 2015-10-14 13:38:01.098843320 -0500 >> Birth: - >> $ stat /tmp/sbatten/ >> File: '/tmp/sbatten/' >> Size: 4096 Blocks: 8 IO Block: 4096 directory >> Device: 803h/2051d Inode: 9568257 Links: 2 >> Access: (0755/drwxr-xr-x) Uid: (163587/ mozes) Gid: (163587/mozes_users) >> Access: 2016-01-19 00:12:23.331201000 -0600 >> Modify: 2015-10-14 13:38:01.098843320 -0500 >> Change: 2016-01-19 00:17:29.658902081 -0600 >> Birth: - >> >> $ du -s --apparent-size -B1 /homes/mozes/tmp/sbatten >> 276572 /homes/mozes/tmp/sbatten >> $ du -s -B1 /homes/mozes/tmp/sbatten >> 147456 /homes/mozes/tmp/sbatten >> >> $ du -s -B1 /tmp/sbatten >> 225280 /tmp/sbatten >> $ du -s --apparent-size -B1 /tmp/sbatten >> 142382 /tmp/sbatten >> >> Notice how the apparent-size version is *exactly* the Size from the >> stat + the size from the "proper" du? > > Err... exactly? Are you sure? > > 138286 + 147456 = 285742 which is != 276572, no? > Anyway thx for your help Adam. > > > -- > François Lafont > _______________________________________________ > ceph-users mailing list > ceph-users@xxxxxxxxxxxxxx > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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