Hi,
What would make the decision easier: if we knew that we could easily
revert the
> "ceph osd crush tunables optimal"
once it has begun rebalancing data?
Meaning: if we notice that impact is too high, or it will take too long,
that we could simply again say
> "ceph osd crush tunables hammer"
and the cluster would calm down again?
MJ
On 2-10-2017 9:41, Manuel Lausch wrote:
Hi,
We have similar issues.
After upgradeing from hammer to jewel the tunable "choose leave stabel"
was introduces. If we activate it nearly all data will be moved. The
cluster has 2400 OSD on 40 nodes over two datacenters and is filled with
2,5 PB Data.
We tried to enable it but the backfillingtraffic is to high to be
handled without impacting other services on the Network.
Do someone know if it is neccessary to enable this tunable? And could
it be a problem in the future if we want to upgrade to newer versions
wihout it enabled?
Regards,
Manuel Lausch
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