> On Apr 1, 2020, at 10:07 AM, Mohr Jr, Richard Frank <rm...@utk.edu> wrote: > > > >> On Apr 1, 2020, at 3:55 AM, 肖正刚 <guru.nov...@gmail.com> wrote: >> >> For " the recent lustre versions use a 1KB inode size by default and the >> default format options create 1 inodes for every 2.5 KB of MDT space" : >> I checked the inode size is 1KB and in my online systems, as you said , >> about 40~41% of mdt disk space consumed by inodes. >> but from the manual I found the default "inode ratio" is 2K, so where the >> additional 0.5KB comes from ? >> > > I was basing this on info I found in this email thread: > > http://lists.lustre.org/pipermail/lustre-discuss-lustre.org/2018-February/015302.html > > I think the 2K/inode ratio listed in the manual may be incorrect (or perhaps > someone can point out my mistake).
Looking at the lustre source (utils/libmount_utils_ldiskfs.c), the default behavior is determined by this line: bytes_per_inode = inode_size + 1536 So the default bytes per inode is 1K (inode size) + 1.5K = 2.5K — Rick Mohr Senior HPC System Administrator Joint Institute for Computational Sciences University of Tennessee _______________________________________________ lustre-discuss mailing list lustre-discuss@lists.lustre.org http://lists.lustre.org/listinfo.cgi/lustre-discuss-lustre.org