Hi all,
In our current production cluster we have the following CRUSH
hierarchy, see https://pastebin.com/640Q4XSH or the attached image.
This reflects 1:1 real physical deployment. We currently use also a
replica factor of 3 with the following CRUSH rule on our pools:
rule hdd_replicated {
id 0
type replicated
min_size 1
max_size 10
step take hdd
step chooseleaf firstn 0 type rack
step emit
}
I can imagine with such design it's hard to achieve a good data
distribution. Right? Moreover, we are currently getting a lot of "near
full" warnings for several OSDs and had one full OSD, but the cluster
has more than 400 TB free space available from a total cluster size of
1,2 PB.
So what could we consider:
1) Changing the crush rule above in away to achieve better data distribution?
2) Adding a third "dummy" datacenter with 2 "dummy" racks and
distribute the hosts evenly across all datacenters? Then use a crush
rule with "step chooseleaf firstn 0 type datacenter".
3) Adding a third "dummy" datacenter each with on Rack and then
distribute the hosts evenly across? Then use a crush rule with "step
chooseleaf firstn 0 type datacenter".
4) Other suggestions?
We a currently running on Luminous 12.2.4.
Thanks for any feedback...
Best,
Martin
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