Hi, I'm planning to install a new Ceph cluster (Nautilus) using 8+3 EC, SATA-only storage. We want to store here only big files (from 40-50MB to 200-300GB each). The write load will be higher than the read load . I was thinking at the following Bluestore config to reduce the load on the drives as much as possible and also to have a good storage efficiency : - stripe_unit for Jerasure EC profile = 256K - bluestore_min_alloc_size_hdd = bluefs_alloc_size = 1M - rados obj size = 4M - rgw_max_chunk_size=4M = rgw_obj_stripe_size What do you think ? Is there any gain in using a higher rgw_max_chunk_size and/or rgw_obj_stripe_size (for example 20M instead of 4M) ? What about bluestore_min_alloc_size and bluefs_alloc_size ? Should I lower them to 512K or 256K ? Thanks, Adrian