hi Chris, if you create a new placement target for this fast storage, you'd have to provide pool mappings for it on both zones even if you only want one zone to use it. and you're right that sync policy can disable replication, but that just means both zones will have separate views of the bucket. nothing would prevent clients from uploading objects to the 'wrong' zone, or deleting the empty bucket on one zone even though it's populated on the other you might prefer to create a separate zonegroup/zone for these non-replicated buckets. buckets created in that zonegroup would still be visible to the original two zones, but http requests would redirect to the correct zonegroup/zone so there'd be no confusion about what zones contain its object data. the downside is that it means deploying additional radosgws for this new zonegroup/zone at one of the sites and teaching clients/applications how to create buckets there in https://github.com/ceph/ceph/pull/62772 i've been exploring a "zone-local bucket" feature that uses zone redirects without requiring a separate zonegroup/zone, but the boto3 sdk doesn't properly handle these redirects - and that apparently applies to existing cross-zonegroup redirects as well On Sun, Dec 21, 2025 at 9:11 PM Christopher Durham via ceph-users <ceph-users@ceph.io> wrote:

Hi, I have a multi site configuration with two sites that works just find for S3 bucket replication in both directions for the sites. - Rocky 9 and Ceph 19.2.2. The customer now wishes to add some additional higher speed storage on one side that does not get replicated for the buckets on that storage. My thought is that this should be a separate pool. and use bucket sync policy to prevent buckets created on that pool from replicating. But as I understand it, the bucket itself must exist on both sides. What do I do to properly create that bucket on the side that will not have the data? Do I do something clever with placement groups to have the bucket created on existing storage on the one side, but have it created on the new storage pool on the side where the new storage will be? Thanks for any information you all may have -Chris

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