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High CPU Utilization and ZFS Write Latency Observed When the ARC Grows to its Maximum Size. (Doc ID 1355094.1)

Last updated on JANUARY 30, 2022

Applies to:

Solaris x64/x86 Operating System - Version 10 5/09 U7 and later
Solaris Operating System - Version 10 5/09 U7 and later
Information in this document applies to any platform.


If the described issue occurs, the following will happen:

  • Writes will be delayed for multiple seconds while large arc_evict_ghost() is running from arc_shrink().
  • High CPU utilization in kernel (sys) mode will be observed in mpstat(1M) at least for a CPU busy in the ARC eviction ghost code.

The following one-line DTrace script will show the problem:


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