Hi All,
I have a cluster that I've been pushing data into in order to get an idea of how full it can get prior ceph marking the cluster full. Unfortunately, each time I fill the cluster I end up with one disk that typically hits the full ratio (0.95) while all other disks still have anywhere from 20-40% free space (my latest attempt resulted in the cluster marking full at 60% total usage). Any idea why the OSDs would be so unbalanced?
Few notes on the cluster:
- It has 6 storage hosts with 143 total OSDs (typically 144 but it has one failed disk - removed from cluster)
- All OSDs are 4TB drives
- All OSDs are set to the same weight
- The cluster is using host rules
- Using ceph version 0.80.7
In terms of the Pool(s), I have been varying the number of pools from run to run, following the PG calculator at http://ceph.com/pgcalc/ to determine the number of placement groups. I have also attempted a few runs bumping up the number of PGs, but it has only resulted in further unbalance.
Any thoughts?
Thanks,
Matt
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