[Lustre-discuss] -i and -I options to mkfs.ext2

[Roger Spellman]

Thanks for the feedback.  I thought that the only things on the MDT is
meta-data, i.e. filenames, directory names, and inodes.  

So, if the size of an Inode (-I) is 512, and if we can assume that
filename sizes are much less than 512 bytes, then perhaps the ratio of
inodes to space in the file system (-i) should be 1024.  Does this make
sense?

Why would you want the ratio of inodes to space in the file system to be
4096, unless you are expecting filenames of over 3k on average?

-Roger


Jakob Goldbach wrote
> No, you still need data blocks for directories to hold filenames. 

Andreas Dilger Wrote
> > Why is the lower-case -i option 4096 but the upper-case -I 
> option 512?
> > Shouldn't these two be the same on and MDT?  Otherwise, we wasting 
> > memory on the MDT.
> 
> These are described in the mke2fs man page.  -I is the size 
> of the inode itself.  -i is the ratio of inodes to the space 
> in the filesystem, as in
> 
> 	inode_count = device_size / inode_ratio
>