[LU-11211] Performance degradation in mdtest

• Type: Bug
• Resolution: Unresolved
• Priority: Major
• Affects Version/s: Lustre 2.11.0
• Severity: 3
• Assignee: WC Triage
• Reporter: Abe (Inactive)

Description

We are observing performance degradation in mutest IOPs testing at around 50K IOPS with zfs. 

Configuration has DNE and DOM, however it seems there is only one MDT that is being utilized out of 3 MDTs:

 

steps for the configuration in place:

 

root@mds-201 ~]# zpool list
NAME SIZE ALLOC FREE EXPANDSZ FRAG CAP DEDUP HEALTH ALTROOT
mdtpool 744G 2.35G 742G - 0% 0% 1.00x ONLINE -
mdtpool1 744G 12.1M 744G - 0% 0% 1.00x ONLINE -
mdtpool2 372G 8.96M 372G - 0% 0% 1.00x ONLINE -
[root@mds-201 ~]#

 

lfs setstripe -E 1M -L mdt -E -1 /mnt/lustre/domdir
lfs setstripe -L mdt --component-end 1M /mnt/lustre/domdir/MDT0
lfs setstripe -L mdt --component-end 1M /mnt/lustre/domdir/MDT1
lfs setstripe -L mdt --component-end 1M /mnt/lustre/domdir/MDT5

 

 

snapshots of the results:

Command line used: ./mdtest -d /mnt/lustre/domdir-mdts/testdir-4 -n 47662 -F -e -u -i 1
Path: /mnt/lustre/domdir-mdts
FS: 351.4 TiB Used FS: 0.0% Inodes: 184.4 Mi Used Inodes: 0.0%

44 tasks, 2097128 files

SUMMARY: (of 1 iterations)
Operation Max Min Mean Std Dev
--------- — --- ---- -------
File creation : 18572.644 18572.644 18572.644 0.000
File stat : 22206.703 22206.703 22206.703 0.000
File read : 66375.392 66375.392 66375.392 0.000
File removal : 11525.913 11525.913 11525.913 0.000
Tree creation : 1016.260 1016.260 1016.260 0.000
Tree removal : 2.698 2.698 2.698 0.000

– finished at 08/03/2018 09:41:01 –
================= 11 client END =======================

 

thanks,

Abe

 

 

Issue Links

• is related to: LU-11213 DNE3: remote mkdir() in ROOT/ by default