There is a need for a repair with both DCs as rebuild will not stream all replicas, so unless you can guarantee you were perfectly consistent at time of rebuild you'll want to do a repair after rebuild.
On another note you could just replace the nodes but use GPFS instead of EC2 snitch, using the same rack name. On Fri., 29 Jun. 2018, 00:19 Rahul Singh, <rahul.xavier.si...@gmail.com> wrote: > Parallel load is the best approach and then switch your Data access code > to only access the new hardware. After you verify that there are no local > read / writes on the OLD dc and that the updates are only via Gossip, then > go ahead and change the replication factor on the key space to have zero > replicas in the old DC. Then you can decommissioned. > > This way you are hundred percent sure that you aren’t missing any new > data. No need for a DC to DC repair but a repair is always healthy. > > Rahul > On Jun 28, 2018, 9:15 AM -0500, Randy Lynn <rl...@getavail.com>, wrote: > > Already running with Ec2. > > My original thought was a new DC parallel to the current, and then > decommission the other DC. > > Also my data load is small right now.. I know small is relative term.. > each node is carrying about 6GB.. > > So given the data size, would you go with parallel DC or let the new AZ > carry a heavy load until the others are migrated over? > and then I think "repair" to cleanup the replications? > > > On Thu, Jun 28, 2018 at 10:09 AM, Rahul Singh < > rahul.xavier.si...@gmail.com> wrote: > >> You don’t have to use EC2 snitch on AWS but if you have already started >> with it , it may put a node in a different DC. >> >> If your data density won’t be ridiculous You could add 3 to different DC/ >> Region and then sync up. After the new DC is operational you can remove one >> at a time on the old DC and at the same time add to the new one. >> >> Rahul >> On Jun 28, 2018, 9:03 AM -0500, Randy Lynn <rl...@getavail.com>, wrote: >> >> I have a 6-node cluster I'm migrating to the new i3 types. >> But at the same time I want to migrate to a different AZ. >> >> What happens if I do the "running node replace method" with 1 node at a >> time moving to the new AZ. Meaning, I'll have temporarily; >> >> 5 nodes in AZ 1c >> 1 new node in AZ 1e. >> >> I'll wash-rinse-repeat till all 6 are on the new machine type and in the >> new AZ. >> >> Any thoughts about whether this gets weird with the Ec2Snitch and a RF 3? >> >> -- >> Randy Lynn >> rl...@getavail.com >> >> office: >> 859.963.1616 <+1-859-963-1616> ext 202 >> 163 East Main Street - Lexington, KY 40507 - USA >> <https://maps.google.com/?q=163+East+Main+Street+-+Lexington,+KY+40507+-+USA&entry=gmail&source=g> >> >> <https://www.getavail.com/> getavail.com <https://www.getavail.com/> >> >> > > > -- > Randy Lynn > rl...@getavail.com > > office: > 859.963.1616 <+1-859-963-1616> ext 202 > 163 East Main Street - Lexington, KY 40507 - USA > > <https://www.getavail.com/> getavail.com <https://www.getavail.com/> > >