ESMF ratio of data blocks to inodes

...in the existing GFS partitions, including the /home backups

1031.843 512 byte blocks / inode

2003-09-13

1032 is ~516K/inode

Now to find out how many files can fit in 30TB:
30 * 1024 * 1024 * 1024 / 516 (K) = 62426850 files we would need

With that many files, use the upper bound of 8k/file for Lustre
 62426850 * 8 / 1024 / 1024  = ~476GB MDS filesystem.

So in short, we should be safe with ~500GB of MDS filestorage if your
file size distribution stays the same for a 30TB filesystem.

I hope that math and data helps,
Nic