[LU-14689] starting running HSM coordinator should success

• Type: Improvement
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.15.0
• Assignee: Li Xi
• Reporter: Li Xi

Description

The HSM control interface only accept a starting/stopping command for once. The further same command would fail. This behavior is unfriendly to scripts since the script has no idea why exactly the second same command fails.

By contrast, setting "disabled" would always success. The different behaviors of "disabled", "enabled" and "shutdown" is inconsistent thus confusing.

# lctl set_param mdt.*.hsm_control=enabled
mdt.lustre0-MDT0000.hsm_control=enabled
# lctl set_param mdt.*.hsm_control=enabled
error: set_param: setting /proc/fs/lustre/mdt/lustre0-MDT0000/hsm_control=enabled: Operation already in progress
# lctl set_param mdt.*.hsm_control=disabled
mdt.lustre0-MDT0000.hsm_control=disabled
# lctl set_param mdt.*.hsm_control=disabled
mdt.lustre0-MDT0000.hsm_control=disabled
# lctl set_param mdt.*.hsm_control=shutdown
mdt.lustre0-MDT0000.hsm_control=shutdown
# lctl set_param mdt.*.hsm_control=shutdown
error: set_param: setting /proc/fs/lustre/mdt/lustre0-MDT0000/hsm_control=shutdown: Operation already in progress

Returning success on all redundant starting/stopping commands seems better.

Issue Links

• is duplicated by: LU-11374 setting mdt.*.hsm_control=enabled should succeed when HSM is already enabled