It depends. There are a lot of variables, like how many nodes and disks you currently have. Are you using journals on SSD. How much data is already in the cluster. What the client load is on the cluster.
Since you only have 40 GB in the cluster, it shouldn't take long to backfill. You may find that it finishes backfilling faster than you can format the new disks.
Since you only have a single OSD node, you must've changed the crushmap to allow replication over OSDs instead of hosts. After you get the new node in would be the best time to switch back to host level replication. The more data you have, the more painful that change will become.
On Sun, Jan 18, 2015 at 10:09 AM, Georgios Dimitrakakis <giorgis@xxxxxxxxxxxx> wrote:
Hi Jiri,
thanks for the feedback.
My main concern is if it's better to add each OSD one-by-one and wait for the cluster to rebalance every time or do it all-together at once.
Furthermore an estimate of the time to rebalance would be great!
Regards,
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