On May 13, 2008 19:41 +0200, Thomas Roth wrote: > I'm still in trouble with numbers: the available, used and necessary > space on my MDT: > According to "lfs df", I have now filled my file system with 115.3 TB. > All of these files are sized 5 MB. That should be roughly 24 million files. > For the MDT, "lfs df" reports 28.2 GB used. > > Now I believed that creating a file on Lustre means using one inode on > the MDT. Since all of my Lustre partitions were formatted with the > default options (all of this is running Lustre v. 1.6.4.3, btw), an > inode should eat up 4kB on the MDT partition. Of course, 24 million > files times 4 kB gives you 91 GB rather than 28GB. > Obviously, there is something I missed completely. Perhaps somebody > could illuminate me here? > > This issue could also be phrased as "How large should my MDT be to > accommodate n TB storage space?" The manual's answer boils down to "= > number of files * 4 kB " (*2 per recommendation). That's how I > calculated above - maybe my test system is broken? I can't check on the > content of these files, it's just 5MB test files created with the > 'stress' utility.
Please provide output of "lfs df" and "lfs df -i" so we can see the actual numbers. Cheers, Andreas -- Andreas Dilger Sr. Staff Engineer, Lustre Group Sun Microsystems of Canada, Inc. _______________________________________________ Lustre-discuss mailing list [email protected] http://lists.lustre.org/mailman/listinfo/lustre-discuss
