[LU-14975] DNE3: directory migration in non-recursive mode

• Type: New Feature
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.15.0
• Labels: migration_improvements
• Epic Link: MDT rebalance v3
• Assignee: Lai Siyao
• Reporter: Lai Siyao

Description

Directory migration will migrate target directory and all of its subdirectories to target MDTs recursively, this will cause huge inodes migration if the target directory is deep and contains lots of sub files. To make this more flexible, a "--non-recursive" option can be added to "lfs migrate -m" to only migrate target directory and the first level of sub files under it.

Issue Links

• is duplicated by: LU-14210 DNE3: "lfs migrate -m" should allow-non-recursive migration
• is related to: LU-16717 Directory restripe breaking lmv stripe settings
• is related to: LU-7607 Preserve inode number after MDT migration
• is related to: LU-14211 DNE3: mechanism to interrupt and resume migration
• is related to: LU-15001 improve recovery of interrupted directory migrate
• is related to: LU-15211 lfs migrate metadata performance test plan
• is related to: LU-14366 "lfs mkdir" on existing directory returns "Operation not supported/already in progress"
• is related to: LU-15001 improve recovery of interrupted directory migrate
• is related to: LU-13076 DNE3: lfs migrate -m should allow -1 as the target index