> On Aug 20, 2018, at 2:58 AM, ANS <ans3...@gmail.com> wrote: > > 1) CentOS 7.4 > 2) Lustre version 2.11 > 3) MDT LUN Size is 6.5 TB (RAID 10) and after formatting using lustre we are > getting the size as 3.9 TB, when formatted using XFS is showing accurate.
For Lustre 2.10 and up, the default inode size is 1KB. Unless you specifically pass different options to your mkfs command, it will create an inode for every 2.5KB of MDT space. So the amount of free space will actually be 1.5KB/2.5KB = 60% of the total space. For your MDT, 0.6 x 6.5TB = 3.9TB. That is the source of the size discrepancy. -- Rick Mohr Senior HPC System Administrator National Institute for Computational Sciences http://www.nics.tennessee.edu _______________________________________________ lustre-discuss mailing list lustre-discuss@lists.lustre.org http://lists.lustre.org/listinfo.cgi/lustre-discuss-lustre.org
