Hi,
We have a 3-site Ceph cluster and would like to create a 4+2 EC pool
with 2 chunks per datacenter, to maximise the resilience in case of 1
datacenter being down. I have not found a way to create an EC profile
with this 2-level allocation strategy. I created an EC profile with a
failure domain = datacenter but it doesn't work as, I guess, it would
like to ensure it has always 5 OSDs up (to ensure that the pools remains
R/W) where with a failure domain = datacenter, the guarantee is only 4.
My idea was to create a 2-step allocation and a failure domain=host to
achieve our desired configuration, with something like the following in
the crushmap rule:
step choose indep 3 datacenter
step chooseleaf indep x host
step emit
Is it the right approach? If yes, what should be 'x'? Would 0 work?
From what I have seen, there is no way to create such a rule with the
'ceph osd crush' commands: I have to download the current CRUSHMAP, edit
it and upload the modified version. Am I right?
Thanks in advance for your help or suggestions. Best regards,
Michel
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