2014-05-13 21:21 GMT+02:00 Gregory Farnum <greg at inktank.com>: > You misunderstand. Migrating between machines for incrementally > upgrading your hardware is normal behavior and well-tested (likewise > for swapping in all-new hardware, as long as you understand the IO > requirements involved). So is decommissioning old hardware. But if you > only care about (for instance, numbers pulled out of thin air) 30GB > out of 100TB of data in the cluster, it will be *faster* to move only > the 30GB you care about, instead of rebalancing all the data in the > cluster across to new machines. :) Subject on this thread is : "migrate WHOLE cluster", so, I meant to migrate THE WHOLE CLUSTER not only a part of it. If my cluster is made by 100TB, I have to migrate 100TB of datas. So, can I manually replace all mons and osds one per time? For example: add 1 mon, remove 1 mon, add 1 mon, remove 1 mon and so on until all mons are replace. Then: add 1 osd, wait for rebalance, remove 1 osd, wait for rebalance and so on ultil all OSD are migrated. This should work with no downtime and no data loss.
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