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Type:
Question
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Resolution: Duplicate
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Priority:
Minor - P4
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None
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Affects Version/s: 3.6.3
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Component/s: Write Ops
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Environment:hw: AWS c4.2xlarge
operating system: Ubuntu xenial
kernel: 4.4.0-92-generic #115-Ubuntu SMP Thu Aug 10 09:04:33 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
mongodb volume: 130GiB io1 1000 IOPS
conf:
storage:
dbPath: /data/data
journal:
enabled: true
engine: wiredTiger
systemLog:
destination: file
logAppend: true
path: /data/log/mongod.log
net:
port: 27017
bindIp: 0.0.0.0
replication:
oplogSizeMB: 512
replSetName: foo
operationProfiling:
slowOpThresholdMs: 1
mode: offhw: AWS c4.2xlarge operating system: Ubuntu xenial kernel: 4.4.0-92-generic #115-Ubuntu SMP Thu Aug 10 09:04:33 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux mongodb volume: 130GiB io1 1000 IOPS conf: storage: dbPath: /data/data journal: enabled: true engine: wiredTiger systemLog: destination: file logAppend: true path: /data/log/mongod.log net: port: 27017 bindIp: 0.0.0.0 replication: oplogSizeMB: 512 replSetName: foo operationProfiling: slowOpThresholdMs: 1 mode: off
Yesterday I upgraded one of our 3.4 mongodb cluster to 3.6 (3.4.9 -> 3.6.3).
After upgrade I noticed increased write IO (IOPS and throughput).
Added also 2 screenshots, upgrade was done at 5:20.
When looking with iotop, I can see WTOplog.lThread is writing a lot, does it mean that 3.6 writes more oplog? Is it something that is expected or is it regression?
- duplicates
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SERVER-31679 Increase in disk i/o for writes to replica set
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- Closed
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