Assuming you have the spare throughput-/IOPS for Ceph to do its thing without disturbing your clients, this will work fine. -Greg
On Tuesday, May 13, 2014, Gandalf Corvotempesta < [email protected]> wrote: > 2014-05-13 21:21 GMT+02:00 Gregory Farnum <[email protected] <javascript:;> > >: > > 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. > -- Software Engineer #42 @ http://inktank.com | http://ceph.com
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