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Slow lun access with high latency from Network subsystem

  1. Last updated
    Jun 25, 2024
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104
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Category:
ontap-9
Specialty:
perf
Last Updated:
6/25/2024, 5:21:47 PM

Applies to

  • ONTAP 9
  • Fibre Channel LUNs

Issue

  • Multiple ESXI Datastore are failing and going offline, either they show as inaccessible, or they are extremely slow when data access.
  • High network latency reported on the storage during the issue

2010016086 - qos stats.png

  • End-to-End connectivity was checked and no issues reported on the Fabric end. 
  • Multiple low memory errors seen in EMS during  the time frame of the issue:  

Sat Jan 27 09:31:02 +1000 [cluster02: mpcleaner_thread1: wafl.memory.statusVeryLowMemory:alert]: WAFL is running very low on memory, with 2171MB remaining.
Sat Jan27 09:36:02 +1000 [cluster02: wafl_exempt04: wafl.memory.statusVeryLowMemory:alert]: WAFL is running very low on memory, with 2111MB remaining.
Sat Jan 27 09:41:03 +1000 [cluster02: wafl_exempt10: wafl.memory.statusVeryLowMemory:alert]: WAFL is running very low on memory, with 2219MB remaining.​

 

 

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