Hi everyone, I'm currently planning a Ceph-based S3 storage backend, with a strong focus on balancing performance and cost (EUR per TB). Fully SSD-based setups seem too expensive for my use case, while HDD-only configurations might be too slow.
My current idea is to use a hybrid approach: - HDDs for bluestore_block (bulk data) - Enterprise SSDs for bluestore_block.db and bluestore_block.wal (metadata and journal) The main client of this S3 backend will be Veeam, which, as far as I can tell, uses larger block sizes. Since this results in fewer random writes and mostly sequential I/O, I assume this kind of workload can work well with HDDs — as long as metadata is fast (hence SSDs for DB/WAL). Am I on the right track with this assumption? - Do you have any benchmark results (real-world or synthetic) comparing HDD-only vs Hybrid setups for object workloads like Veeam? That would help a lot to quantify the performance difference. - What SSD-to-HDD ratio would you recommend? (I’ve seen 1 SSD per 3–5 HDDs) Any advice or confirmation from those running similar setups would be much appreciated! So far i found: https://www.hyperscalers.com/image/catalog/00-Products/Storage%20Servers/White%20Paper%20-%20Performance%20Testing%20of%20Ceph%20with%20SD1Q-1ULH.pdf => which mentions Ceph Verstion 0.94.5 and the performance boot does not seem too big here And here: https://www.ambedded.com.tw/en/use-case/use-case-08.html they dont mention such a Hybrid Setup Thanks a lot in advance! Best regards, Michael _______________________________________________ ceph-users mailing list -- ceph-users@ceph.io To unsubscribe send an email to ceph-users-le...@ceph.io
