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Type: Bug
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Resolution: Duplicate
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Priority: Major - P3
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None
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Affects Version/s: 4.0.18
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Component/s: None
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None
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ALL
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(copied to CRM)
We upgraded our sharded cluster from mongo 3.6 to 4.0.18 on Linux Stretch. Since then IO utilization is almost always at 100%Unable to render embedded object: File ( Almost all monitored metrics look worse than before the upgrade) not found. I'll attach a screenshot where you can see that IO utilization went up to almost constant 100% at around 0:00 o'clock when we upgraded the shard to mongodb 4.0.18
We did not yet set FCV to 4.0 to allow our deployment to run without enabling these features for a burn-in period to ensure the likelihood of downgrade is minimal - as suggested in mongodb's documentation.
Any help is greatly appreciated because this issue becomes critical!
- is duplicated by
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SERVER-3645 Sharded collection counts (on primary) can report too many results
- Closed