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ucla-physicalsciences / zfsonlinux

Documentation & scripts to deploy & maintain ZFS on linux
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understand bonnie++ output #4

Open henryz17 opened 2 years ago

henryz17 commented 2 years ago

Chart with different outputs. Plutus has no slog

henryz17 commented 2 years ago

`[root@plutus ~]# arc_summary -s arc

ZFS Subsystem Report Fri Oct 07 15:15:33 2022 Linux 4.18.0-372.16.1.el8_6.0.1.x86_64 2.1.5-2 Machine: plutus.atmos.ucla.edu (x86_64) 2.1.5-2

ARC status: HEALTHY Memory throttle count: 0

ARC size (current): 47.8 % 30.0 GiB Target size (adaptive): 100.0 % 62.7 GiB Min size (hard limit): 6.2 % 3.9 GiB Max size (high water): 16:1 62.7 GiB Most Frequently Used (MFU) cache size: 20.0 % 6.0 GiB Most Recently Used (MRU) cache size: 80.0 % 23.9 GiB Metadata cache size (hard limit): 75.0 % 47.0 GiB Metadata cache size (current): 0.2 % 112.0 MiB Dnode cache size (hard limit): 10.0 % 4.7 GiB Dnode cache size (current): < 0.1 % 1.2 MiB

ARC hash breakdown: Elements max: 2.1M Elements current: 14.5 % 297.6k Collisions: 441.4k Chain max: 4 Chains: 2.6k

ARC misc: Deleted: 1.7M Mutex misses: 78 Eviction skips: 0 Eviction skips due to L2 writes: 0 L2 cached evictions: 0 Bytes L2 eligible evictions: 210.9 GiB L2 eligible MFU evictions: 0.2 % 373.1 MiB L2 eligible MRU evictions: 99.8 % 210.5 GiB L2 ineligible evictions: 384.0 KiB`

henryz17 commented 2 years ago

graph for zpool on argo with and without slog. metadata latency is where we see the most significant difference.