[LU-8009] Lustre_rsync does not sync files on MDT1

• Type: Bug
• Resolution: Fixed
• Priority: Major
• Fix Version/s: Lustre 2.9.0
• Affects Version/s: Lustre 2.8.0
• Severity: 3
• Assignee: WC Triage
• Reporter: Tatsushi Takamura

Description

It appears that lustre_rsync does not sync files on MDT1(not MDT0).
Steps to reproduce are as follows:
1) setup changelog on MDT1

#  lctl --device lustre-MDT0001 changelog_register

2) create a sub-directory on MDT1

#  lfs mkdir -i 1 /lustre/mdt1_dir/

3) make the Lustre file system and the replica file system identical

#  rsync -av /lustre/ /mnt/lustre-rsync/

4) create files on the sub-directory on MDT1

# echo aaa > /lustre/mdt1_dir/file

5) run lustre_rsync

# lustre_rsync  --source=/lustre --target=/mnt/lustre-rsync --mdt=lustre-MDT0001 --user=cl1 --verbose

(/mnt/lustre-rsync/mdt1_dir/file is not created)

We think this is because the 3rd parameter of llapi_changelog_start() in lr_replicate() is source file system(status->ls_source_fs), not MDT device(status->ls_mdt_device).
So lustre_rsync refers a wrong changelog.

If we modify this parameter, lustre_rsync replicates correctly.