Hi Sinan, Do you have versioning enabled on the bucket? It may explain that.. ----------------------------------------------------------------- Roberto VALVERDE CAMESELLE IT Storage And Data Management CERN, European Organization for Nuclear Research Esplanade des Particules 1, Geneve (Switzerland) ________________________________ From: Sinan Polat <sinan86polat@gmail.com> Sent: Friday, June 27, 2025 3:59 PM To: ceph-users@ceph.io <ceph-users@ceph.io> Subject: [ceph-users] Re-uploading existing s3 objects slower than initial upload Hi all, I am investigating a performance issue related to uploading s3 objects and would appreciate any insights. I have a bucket with ~200 million objects. I noticed that re-uploading files that already exist in the bucket appears to be slower than uploading them for the first time. To verify this behavior, I created a small test case with a new empty bucket: - 500 files with random sizes between 5 KB and 50 KB. - First time upload took 8 seconds: s3cmd put files/* s3://my-bucket/ - Second upload (same files, no changes) took 10 seconds I had expected the second upload to be faster or at least the same. Is this expected behavior? Any guidance on this would be appreciated. Thanks! Sinan _______________________________________________ ceph-users mailing list -- ceph-users@ceph.io To unsubscribe send an email to ceph-users-leave@ceph.io