[LU-4762] lctl set_param should return error when the value of the parameter is null

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.6.0
• Affects Version/s: Lustre 2.5.0, Lustre 2.6.0
• Severity: 3
• Assignee: Emoly Liu
• Reporter: Emoly Liu

Description

This problem was found by LU-4748 when MDSCOUNT=2

#lctl set_param lov.*mdtlov*.qos_threshold_rr=17% 17%
lov.lustre-MDT0000-mdtlov.qos_threshold_rr=17%
lov.lustre-MDT0001-mdtlov.qos_threshold_rr=17%

Also, it's easy to be found by running the following commands:

#lctl set_param debug_mb
#lctl set_param fail_loc=
fail_loc=

I will push a patch later.

Issue Links

• is related to: LU-4748 sanity test 116b: error: set_param: /proc/{fs,sys}/{lnet,lustre}/17%: Found no match