Details
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Bug
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Resolution: Done
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Major - P3
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None
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None
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None
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Fully Compatible
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ALL
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(copied to CRM)
Description
Hey,
We recently upgraded from MMAP to WT. For the same data amount (~500GB), on an AWS EBS volume which is "cold" (restored from a snapshot) - size 2TB -
MMAP took ~5 minutes to start
WT takes 50
minutes, log mentioning this:
Taking 1005 samples and assuming that each section of oplog contains approximately 5672862 records totaling to 1073741955 bytes
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It apparently scans the oplog (we've set its size to 100GB) - and we see the iowait on 100%. But still, 50 minutes is a lot...
Anything we can do to speed things up?
Attachments
Issue Links
- related to
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DOCS-12807 Using a snapshot restore from AWS EBS can see the oplog sampling performance significantly impacted
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- Closed
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SERVER-41790 Report progress during oplog sampling at startup with higher granularity
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- Closed
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