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Parallelism within the OSD. Inside each OSD, we use the PGs to shard work to allow parallelism across cores and reduce lock contention.
The rule of thumb is that you want somewhere around 100 PG instances per OSD. If you have way less than that the load distribution won’t be as balanced (some OSDs will store more than others), and if you have too many more than that then each OSD will be coordinating with too many other OSDs, increasing overhead and reducing overall reliability.
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sudo smartctl
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sudo smartctl
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