On a large 13TB XFS volume that is being used for backups, I am seeing
bad performance if multiple "rm -rf" processes are running in parallel.
The backups are being done with rsnapshot and the first operation it
does is removing the oldest snapshot. A single rsnapshot does this in
reasonable time, but if four jobs are started at the same time, all
their rm processes run for hours without making much progress.
This seems to be related to the planned optimizations in
Are there any other tuning options I might try? I'm already using
"noatime,nodiratime,nobarrier,logbufs=8,logbsize=256k" as mount options
and did enable lazy_counters for the fs.