<div dir="ltr">Hi, <div>Please forget my first question, I made a mistake.</div><div>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" :</div><div>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.
</div><div>but from the manual I found the default "inode ratio" is 2K, so where the additional 0.5KB comes from ?<br></div><div><br></div><div>Thanks.</div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">\u8096\u6b63\u521a <<a href="mailto:guru.novice@gmail.com">guru.novice@gmail.com</a>> \u4e8e2020\u5e744\u67081\u65e5\u5468\u4e09 \u4e0b\u53481:00\u5199\u9053\uff1a<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">Thanks a lot. <div>I have two more questions:</div><div>1) Assume I consider the mdt space use the method described in lustre manual, by calculation, the metadata space is 400GB.</div><div>After format(default option), about 160GB(40% of 400GB) preallocated for inodes, so the avalaible inodes number is less than estimated, right ?</div><div>2) mds need additional space for other use, like log,acls,xattrs\uff1bhow to estimate these space ?</div><div><br></div><div>Thanks!</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">Mohr Jr, Richard Frank <<a href="mailto:rmohr@utk.edu" target="_blank">rmohr@utk.edu</a>> \u4e8e2020\u5e743\u670831\u65e5\u5468\u4e8c \u4e0b\u53489:57\u5199\u9053\uff1a<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><br>
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> On Mar 30, 2020, at 10:56 PM, \u8096\u6b63\u521a <<a href="mailto:guru.novice@gmail.com" target="_blank">guru.novice@gmail.com</a>> wrote:<br>
> <br>
> Hello, I have some question about metadata space.<br>
> 1) I have ten 960GB SAS SSDs for mdt,after done raid10,we have 4.7TB space free.<br>
> after formated as mdt,we only have 2.6TB space free; so where the 2.1TB space go ?<br>
> 2) for the 2.6TB space, what's it used for?<br>
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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.<br>
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\u2014<br>
Rick Mohr<br>
Senior HPC System Administrator<br>
Joint Institute for Computational Sciences<br>
University of Tennessee<br>
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