Depending on how well you burn-in/test your new disks, I like to only add 1 failure domain of disks at a time in case you have bad disks that you're adding. If you are confident that your disks aren't likely to fail during the backfilling, then you can go with more. I just added 8 servers (16 OSDs each) to a cluster with 15 servers (16 OSDs each) all at the same time, but we spent 2 weeks testing the hardware before adding the new nodes to the cluster.
If you add 1 failure domain at a time, then any DoA disks in the new nodes will only be able to fail with 1 copy of your data instead of across multiple nodes.
On Mon, Dec 4, 2017 at 12:54 PM Karun Josy <karunjosy1@xxxxxxxxx> wrote:
Hi,_______________________________________________Is it recommended to add OSD disks one by one or can I add couple of disks at a time ?Current cluster size is about 4 TB.Karun
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