Thanks a lot. I have two more questions: 1) Assume I consider the mdt space use the method described in lustre manual, by calculation, the metadata space is 400GB. After format(default option), about 160GB(40% of 400GB) preallocated for inodes, so the avalaible inodes number is less than estimated, right ? 2) mds need additional space for other use, like log,acls,xattrs;how to estimate these space ?
Thanks! Mohr Jr, Richard Frank <rm...@utk.edu> 于2020年3月31日周二 下午9:57写道: > > > > On Mar 30, 2020, at 10:56 PM, 肖正刚 <guru.nov...@gmail.com> wrote: > > > > Hello, I have some question about metadata space. > > 1) I have ten 960GB SAS SSDs for mdt,after done raid10,we have 4.7TB > space free. > > after formated as mdt,we only have 2.6TB space free; so where the 2.1TB > space go ? > > 2) for the 2.6TB space, what's it used for? > > That space is used by inodes. I believe 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. So about 40% of your disk space will be > consumed by inodes. > > — > Rick Mohr > Senior HPC System Administrator > Joint Institute for Computational Sciences > University of Tennessee > > > > >
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