[LU-6764] Test directory access during migration for DNE2

• Type: Task
• Resolution: Fixed
• Priority: Blocker
• Fix Version/s: Lustre 2.8.0
• Assignee: Di Wang
• Reporter: Richard Henwood (Inactive)

Description

Access the directory during migration

Setup lustre with 4 MDTs, 4 OSTs and 2 clients.

Create 1 directory and some files under the directory

     
    mkdir /mnt/lustre/migrate_dir
    for F in {1,2,3,4,5}; do
        echo "$F$F$F$F$F" > /mnt/lustre/migrate_dir/file$F
    done

On one client, migrate the directory among 4 MDTs

     
while true; do
    mdt_idx=$((RANDOM % MDTCOUNT))
    lfs migration -m $mdt_idx /mnt/lustre/migrate_dir || break
done
 
echo "migrate directory failed"
return 1

Simultaneously, on another client access these files under the migrating directory

     
while true; do
    N=$((N + 1 % 5))
    stat /mnt/lustre/migrate_dir/file1 > /dev/null || break
    cat /mnt/lustre/migrate_dir/file2 > /dev/null || break
    > /mnt/lustre/migrate_dir/file3 > /dev/null || break
    echo "aaaaa" > /mnt/lustre/migrate_dir/file4 > /dev/null || break
    stat /mnt/lustre/migrate_dir/file5 > /dev/null || break
done
 
echo "access migrating files failed"
return 1

Steps 3 and 4 should keep running at least 5 minutes and will not return error.

Issue Links

• is blocking: LU-6858 Demonstrate DNE2 functionality