Hi folks, I’m not sure the ideal setup for bluestore given the set of hardware I have to work with so I figured I would ask the collective wisdom of the ceph community. It is a small deployment so the hardware is not all that impressive, but I’d still like to get some feedback on what would be the preferred and most maintainable setup. We have 5 ceph OSD hosts with the following setup: 16 GB RAM 1 PCI-E NVRAM 128GB 1 SSD 250 GB 2 HDD 1 TB each I was thinking to put: OS on NVRAM with 2x20 GB partitions for bluestore’s WAL and rocksdb And either use bcache with the SSD to cache the 2x HDDs or possibly use Ceph’s built in cache tiering. My questions are: 1) is a 20GB logical volume adequate for the WAL and db with a 1TB HDD or should it be larger? 2) or - should I put the rocksdb on the SSD and just leave the WAL on the NVRAM device? 3) Lastly, what are the downsides of bcache vs Ceph’s cache tiering? I see both are used in production so I’m not sure which is the better choice for us. Performance is, of course, important but maintainability and stability are definitely more important. Thanks in advance for your advice! Best, Ean -- __________________________________________________ This message contains information which may be confidential. Unless you are the addressee (or authorized to receive for the addressee), you may not use, copy, or disclose to anyone the message or any information contained in the message. If you have received the message in error, please advise the sender by reply e-mail or contact the sender at Price Paper & Twine Company by phone at (516) 378-7842 and delete the message. Thank you very much. __________________________________________________ _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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