[LU-10258] lfs mirror command to read/write specific mirror copy

• Type: Improvement
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.13.0, Lustre 2.12.3
• Labels: FLR2
• Assignee: Zhenyu Xu
• Reporter: Andreas Dilger

Description

It would be useful to add an "lfs open [--ifcomp=<component_id>] [--ofcomp=<component_id>] <command>" that opens the stdin and/or stdout with the specified component ID values, so that e.g. "dd" could be used as a resync tool for stale components, or other arbitrary commands (e.g. MPI file utils for parallel resync, HSM tools for archive handling, etc).

Also useful would be to open a specific mirror number for whole-file access, instead of just a single component. That would be something like "--ifrepl=" and "--ofrepl=" options.

Issue Links

• is related to: LU-10177 DoM: manual migration MDT-OST
• is related to: LU-11421 DoM: manual migration OST-MDT, MDT-MDT
• is related to: LU-13831 lfs mirror command to open a specific mirror copy
• is related to: LU-5170 lfs usability
• is related to: LU-9771 FLR1: Landing tickets for File Level Redundancy Phase 1
• is related to: LU-11245 add 'lfs mirror dump' to dump a mirror content