Hi! I am planning a new Flash-based cluster. In the past we used SAMSUNG PM863a 480G as journal drives in our HDD cluster. After a lot of tests with luminous and bluestore on HDD clusters, we plan to re-deploy our whole RBD pool (OpenNebula cloud) using these disks.
As far as I understand, it would be best to skip journaling / WAL and just deploy every OSD 1-by-1. This would have the following pro's (correct me, if I am wrong): - maximum performance as the journal is spread accross all devices - a lost drive does not affect any other drive Currently we are on CentOS 7 with elrepo 4.4.x-kernel. We plan to migrate to Ubuntu 16.04.3 with HWE (kernel 4.10). Clients will be Fedora 27 + OpenNebula. Any comments? Thank you. Kind regards, Kevin
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