Now, I am clear. Thanks Richard ! Mohr Jr, Richard Frank <rm...@utk.edu> 于2020年4月1日周三 下午10:59写道:
> > > > 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 > > > > >
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