Hallo, we are going to setup a 36-40TB (brutto) test setup in our company for disk2disk2tape backup. Now, we are faced to decide if we go the high- or low density ceph way. --- The big node (only one necessary): 1 x Supermicro, System 6027R-E1R12T with 2 x CPU E5-2620v2 (6 core (Hyper threading) per CPU), 32 GB with - 2 x SSD 80GB (RAID1, OS only) - 2 x SSDD 100GB, Intel s3700 (bandwidth R/W: 500/200MB/sec) for 10 journal (5 each SSD) - 10 x 4TB Seagate Enterprise Capacity ST4000NM0033 - 2 x embedded 10GBit for public/storage network So, I' would install also 1 monitor on this node containing also 10 OSD's. The price is about 20 US Cent / GB ---- The small node (ok - we have to by 3 guy's) could be like 3 x Supermicro, SuperServer 6017R-TDF+ with 1 x E5-2603 (4 cores without Hyper threading), 16GB with 1 x 120 GB SSD Intel Serie S3500 SATA for OS and 3 OSD journal's (bandwidth R/W: 340/100 MB/sec) 2 x Intel® PRO/1000 PT Dual Port Server Adapter (LACP link aggregation, 2 ports for public-, 2 ports for storage network) 3 x 4TB Seagate Enterprise Capacity ST4000NM0033 I would also install a monitor on each node. The price is about 23 US Cent / GB I think, the performance (because of the "better" components like 10GBit, SSD, CPU) is much better in the big node. Because we may not add more HDD to the cluster, I'm not sure how to decide - big or small node. Is there a recommendation? Maybe also in regards to my chosen hardware components ? best regards Danny
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