Hello everyone, I am in the process of adding an additional osd server to my small ceph cluster as well as migrating from filestore to bluestore. Here is my setup at the moment:
Ceph - 12.2.5 , running on Ubuntu 16.04 with latest updates 3 x osd servers with 10x3TB SAS drives, 2 x Intel S3710 200GB ssd and 64GB ram in each server. The same servers are also mon servers. I am adding the following to the cluster: 1 x osd+mon server with 64GB of ram, 2xIntel S3710 200GB ssds. Adding 4 x 6TB disks and 2x 3TB disks. Thus, the new setup will have the following configuration: 4 x osd servers with 8x3TB SAS drives and 1x6TB SAS drive, 2 x Intel S3710 200GB ssd and 64GB ram in each server. This will make sure that all servers have the same amount/capacity drives. There will be 3 mon servers in total. As a result, I will have to remove 2 x 3TB drives from the existing three osd servers and place them into the new osd server and add a 6TB drive into each osd server. As those 6 x 3TB drives which will be taken from the existing osd servers and placed to the new server will have the data stored on them, what is the best way to do this? I would like to minimise the data migration all over the place as it creates a havoc on the cluster performance. What is the best workflow to achieve the hardware upgrade? If I add the new osd host server into the cluster and physically take the osd disk from one server and place it in the other server, will it be recognised and accepted by the cluster? Thanks Andrei
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