[LU-4757] Unable to set upper limit on ost_io threads

• Type: Bug
• Resolution: Won't Fix
• Priority: Minor
• Affects Version/s: Lustre 2.4.2
• Severity: 3
• Assignee: WC Triage
• Reporter: Brett Lee (Inactive)

Description

On an OSS, am unable to configure a persistent throttle the number of ost_io threads. It may be user or doc error, but have tried kernel module settings and a few different conf_param syntax, per section 32.9 of the Lustre manual:

[root@oss0 ~]# lctl get_param ost.OSS.ost_io.threads_max
ost.OSS.ost_io.threads_max=512

[root@oss0 ~]# cat /etc/modprobe.d/lustre.conf
options lnet networks=tcp1(eth3)
options ost oss_num_threads=256

[root@oss0 ~]# lctl conf_param cal.ost.ost_io.threads_max=128
No device found for name MGS: Invalid argument
This command must be run on the MGS.
error: conf_param: No such device

[root@oss0 ~]# lctl conf_param ost.OSS.ost_io.threads_max=128
No device found for name MGS: Invalid argument
This command must be run on the MGS.
error: conf_param: No such device

[root@oss0 ~]# lctl set_param ost.OSS.ost_io.threads_max=128
ost.OSS.ost_io.threads_max=128

[root@oss0 ~]# lctl get_param ost.OSS.ost_io.threads_max
ost.OSS.ost_io.threads_max=128

[root@oss0 ~]# cat /proc/fs/lustre/version
lustre: 2.4.2
kernel: patchless_client
build: 2.4.2-RC2--PRISTINE-2.6.32-358.23.2.el6_lustre.x86_64