Hi German, Are the power feeds completely separate (ie 4 feeds in total), or just each rack has both feeds? If it’s the latter I don’t see any benefit from including this into the crushmap and would just create a “rack” bucket. Also assuming your servers have dual PSU’s, this also changes the power failure scenarios quite a bit as well. In regards to the pools, unless you know your workload will easily fit into a cache pool with room to spare, I would suggest not going down that route currently. Performance in many cases can actually end up being worse if you end up doing a lot of promotions. *However* I’ve been doing a bit of testing with the current master and there are a lot of improvements around cache tiering that are starting to have a massive improvement on performance. If you can get by with just the SAS disks for now and make a more informed decision about the cache tiering when Infernalis is released then that might be your best bet. Otherwise you might just be best using them as a basic SSD only Pool. Nick From: ceph-users [mailto:ceph-users-bounces@xxxxxxxxxxxxxx] On Behalf Of German Anders Hi cephers, I've the following scheme: 7x OSD servers with: 4x 800GB SSD Intel DC S3510 (OSD-SSD) 3x 120GB SSD Intel DC S3500 (Journals) 5x 3TB SAS disks (OSD-SAS) The OSD servers are located on two separate Racks with two power circuits each. I would like to know what is the best way to implement this.. use the 4x 800GB SSD like a SSD-pool, or used them us a Cache pool? or any other suggestion? Also any advice for the crush design? Thanks in advance, German |
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