Hi, Please forget my first question, I made a mistake. 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 ?
Thanks. 肖正刚 <guru.nov...@gmail.com> 于2020年4月1日周三 下午1:00写道: > 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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