[LU-17823] LRM2b: per-File Metadata Replication

• Type: Technical task
• Resolution: Unresolved
• Priority: Minor
• Assignee: WC Triage
• Reporter: Andreas Dilger

Description

Add replication for specified non-directory MDT objects (typically regular files)

• New "lfs setdirstripe" option to specify MDT file object replication
• Inherit LMR attribute for files from parent by default
• Handled like non-replicated remote objects with local agent if parent is LMR && child is non-LMR
  • since agent inode is allocated anyway, space of replication is already used
  • need to keep file layout, xattrs, timestamps, etc. uptodate on replica
• mark agent/replica files to identify/skip by MDT scanning tools

Leverage/enhance LMR1 tools for conversion between LMR file(s) and non-LMR file(s).

Enhance LFSCK to verify and repair LMR files (resync attributes as needed).