Read/Write Latency_limit peak reached

pavelkos
pavelkos
in VMware
Hello!
We recently deploy XoruX-2.16-OVF and setup LPAR2RRD collect vCenter logs. All seems good, but we can see messages in error-vmware.log (attached). This is very strange, because there is no significant load on the storage system. What could be the problem ?

Comments

  • Jindra
    Jindra
    Hello,
    data counters datastore_ Read  or datastore_Write Latency are sometimes not stable and give errorneos numbers
    that si why there is a limit
    my $ds_totalReadLatency_limit  = 10000;    # millisec
    my $ds_totalWriteLatency_limit = 10000;    # millisec

    It is just statistically counted how many times in a load is the limit exceeded - this data
    is left out
    So this is only info to see that such situation is detected, you can ignore it
    Maybe it is more offen when there are low IO loaded volumes.


  • pavelkos
    pavelkos
    Thank you!
  • c3rberus
    c3rberus
    I hit the same issue adding a VC 6.5 cluster to lpar2rrd.

    Fri Jul  5 08:07:25 2019: total Read/Write Latency_limit peak reached: 3 times for datacenter datastore_datacenter-2 /home/lpar2rrd/lpar2rrd/bin/vmw2rrd.pl:1939

    I guess this error can just be ignored based on Jindra's comment.
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