[LU-11605] create_count stuck in 0 after changeing max_create_count to 0 and back 20 000

• Type: Bug
• Resolution: Fixed
• Priority: Major
• Fix Version/s: Lustre 2.13.0, Lustre 2.10.7, Lustre 2.12.1
• Affects Version/s: Lustre 2.12.0, Lustre 2.10.5
• Severity: 3
• Assignee: Sergey Cheremencev
• Reporter: Sergey Cheremencev

Description

Reproducer:
1) Disable creation of new objects on OST0002
pdsh g mds 'lctl set_param osp.l300test-OST0002-osc*.max_create_count=0'
2) Create files from a Lustre client and monitor with 'lfs df -i'. The number of used inodes increase on all the OSTs except OST0002.
3) Enable creation of new objects on OST0002
pdsh g mds 'lctl set_param osp.l300test-OST0002-osc*.max_create_count=1000'
4) Create files from a Lustre client and monitor with 'lfs df -i'. The number of used inodes should increase on all the OSTs, but does not increase for OST0002.

Issue Links

• is related to: LU-11965 interop: sanity test 311 fails with 'create_count is zero'
• is related to: LU-11115 OST selection algorithm broken with max_create_count=0 or empty OSTs
• is related to: LU-4825 lfs migrate not freeing space on OST