Thanks Rick for your detailed info. Can you please let me know what are the preferred standard benchmark tools that i can use for testing the lustre like IOR and what is the result that i can expect.
Thanks, ANS. On Tue, Aug 21, 2018 at 4:49 AM Mohr Jr, Richard Frank (Rick Mohr) < [email protected]> wrote: > > > On Aug 20, 2018, at 2:58 AM, ANS <[email protected]> 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 > > -- Thanks, ANS.
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