On 4/27/11 3:18 PM, Eric Sandeen wrote: > On 4/26/11 4:51 PM, Janos Haar wrote: > > <snip> > >>>> In the result, actually we have >6TB images on the 3TB disk, wich is >>>> 97.9% fragmented. >>> >>> How are you determining that figure? >> >> [root@UNISTORE admin]# cat xfs_get_frat_ratio >> echo loop0 >> xfs_db -c frag -r /dev/loop0 >> [root@UNISTORE admin]# ./xfs_get_frat_ratio >> loop0 >> actual 7650952, ideal 752501, fragmentation factor 90.16% btw we should just nuke that stupid command ;) > so you had 7650952 extents on the fs, ideally you'd have 752501, or so xfs_db says... > > Another way of looking at this is that you have about 10 extents per file on average. > > Depending on the size of the files, this may be perfectly fine. > Is, for example, a 10G file in ten 1G extents really a problem? > > I doubt that fragmentation is your performance problem here. ... note however that you can use xfs_bmap to examine the layout of any particular file. 10 on average may be 1 for most, and 10,000 for the last one. :) -Eric _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
