[LU-10561] "lfs mirror create -N --parent /path/file" does not inherit its parent's layout

• Type: Bug
• Resolution: Fixed
• Priority: Major
• Fix Version/s: Lustre 2.11.0
• Affects Version/s: Lustre 2.11.0
• Labels: FLR
• Severity: 3
• Assignee: Jian Yu
• Reporter: Zhenyu Xu

Description

# lfs getstripe -d /mnt/lustre/dir
stripe_count:  2 stripe_size:   4194304 pattern:       raid0 stripe_offset: 1

# lfs mirror create -N --parent /mnt/lustre/dir/file3

# lfs getstripe /mnt/lustre/dir/file
/mnt/lustre/dir/file
  lcm_layout_gen:    1
  lcm_mirror_count:  1
  lcm_entry_count:   1
    lcme_id:             1
    lcme_flags:          init
    lcme_extent.e_start: 0
    lcme_extent.e_end:   EOF
      lmm_stripe_count:  1
      lmm_stripe_size:   1048576
      lmm_pattern:       raid0
      lmm_layout_gen:    0
      lmm_stripe_offset: 2
      lmm_objects:
      - 0: { l_ost_idx: 2, l_fid: [0x100020000:0x4:0x0] }

My thought about the inheritance is:

• If parent is a plain directory, the "-N --parent" should create a mirror contains a single component covering [0, eof) and inherit its stripe options.
• If parent is a PFL directory, newly created mirror should inherit the whole components of its parent directory.
• If parent is a FLR directory, newly created mirror should inherit one of the mirror of its parent.

Issue Links

• is related to: LU-9771 FLR1: Landing tickets for File Level Redundancy Phase 1