Hello,
I'm looking for some advice on how to most safely increase the pgs in our primary ceph pool.
A bit of background: We're running ceph 0.80.9 and have a cluster of 126 OSDs with only 64 pgs allocated to the pool. As a result, 2 OSDs are now 88% full, while the pool is only showing as 6% used.
Based on my understanding, this is clearly a placement problem, so the plan is to increase to 2048 pgs. In order to avoid significant performance degradation, we'll be incrementing pg_num and pgp_num one power of two at a time and waiting for the cluster to rebalance before making the next increment.
My question is: are there any other steps we can take to minimize potential performance impact? And/or is there a way to model or predict the level of impact, based on cluster configuration, data placement, etc?
Thanks in advance for any answers,
Robin
I'm looking for some advice on how to most safely increase the pgs in our primary ceph pool.
A bit of background: We're running ceph 0.80.9 and have a cluster of 126 OSDs with only 64 pgs allocated to the pool. As a result, 2 OSDs are now 88% full, while the pool is only showing as 6% used.
Based on my understanding, this is clearly a placement problem, so the plan is to increase to 2048 pgs. In order to avoid significant performance degradation, we'll be incrementing pg_num and pgp_num one power of two at a time and waiting for the cluster to rebalance before making the next increment.
My question is: are there any other steps we can take to minimize potential performance impact? And/or is there a way to model or predict the level of impact, based on cluster configuration, data placement, etc?
Thanks in advance for any answers,
Robin
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