[LU-17703] some pool inheritance fixes

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.16.0
• Severity: 3
• Assignee: Vitaly Fertman
• Reporter: Vitaly Fertman

Description

a couple of problems on inheritance:

• the start index inherited from parent may conflict to the pool inherited from root what prevents new file creation;
• adjust stripe_count by the count of targets in the pool only if the pool is not dropped on inheritance;
• a new dir does not inherit the ost list, but inherit the other LOVEA parameters, start index in particular;

Issue Links

• is related to: LU-15658 Interop sanity-flr test_0b test_0c test_0e test_0f: verify pool failed != flash
• is related to: LU-14480 Setting specific OST's under pool failed with error message "invalid argument"