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CONTAP-61034: Degradation in client nfs operating performance on systems with high number of CPUs and huge load on single volume

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Category:
ontap-9
Specialty:
core
Last Updated:
4/2/2025, 10:39:35 AM

Issue

  • cpu_busy abnormally high on a 48-CPU A800(usually > 90%)
  • nwk_exempt CPU domain util abnormally high (usually > 2000%) on a 48-CPU A800

cluster1::*> set diag; system node run -node nodeA -command systat -c 10 -M 1; set admin
AVG Nwk_Excl Nwk_Lg Nwk_Exmpt Protocol Cluster Storage Raid Raid_Ex Target Kahuna WAFL_Ex(Kahu) WAFL_XClean SM_Exempt Exempt SSAN_Ex Intr Host
45% 4% 7% 2150% 0% 0% 6% 2% 6% 5% 42% 32% 35% 0% 0% 9% 9% 6%
48% 4% 7% 2159% 0% 0% 5% 8% 5% 3% 48% 43% 37% 0% 0% 10% 7% 5%
68% 5% 8% 2155% 3% 10% 3% 7% 0% 0% 60% 105% 45% 0% 0% 10% 7% 5%

 

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