PowerScale：Isilon：CloudPools 作業導致 CPU 使用率過高isi_cpool_d
Summary: 此isi_cpool_d程序可能會導致 PowerScale Isilon 叢集上的 CPU 使用率過高。
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Symptoms
isi_cpool_d程序顯示叢集上的 CPU 使用率持續偏高。
Isilon-1# top -n 10 PID USERNAME THR PRI NICE SIZE RES STATE C TIME WCPU COMMAND 87857 root 124 20 0 595M 173M nanslp 13 1722.5 857.62% isi_cpool_d 3455 root 29 98 r150 397M 86M sigwai 10 4216.2 62.55% nfs 3313 root 40 98 r150 1018M 683M sigwai 14 7402.9 47.71% lwio 94259 root 13 52 0 566M 491M usem 18 374.1H 32.57% isi_celog_monitor 18378 root 5 20 0 102M 53M uwait 3 49:57 24.56% isi_job_d 34552 root 1 52 0 37M 15M adv 22 112.6H 20.51% isi_migr_sched 3144 root 13 20 0 52M 13M select 8 2009.5 15.33% isi_audit_d 98432 root 1 52 0 105M 66M kqread 26 417:47 14.55% isi_celog_analysis 3213 root 26 52 0 96M 28M uwait 10 1109.2 12.50% isi_avscan_d 51167 root 5 20 0 93M 42M uwait 21 74:37 10.40% isi_job_d ... ..
叢集上可能會執行多個 CloudPools 工作，但即使所有工作都已暫停，isi_cpool_d使用率仍然很高。
Isilon-1# isi cloud jobs list ID Description Effective State Type --------------------------------------------------------------------------------------- 1 Write updated data to the cloud paused cache-writeback 2 Expire CloudPools cache paused cache-invalidation 4 Clean up unreferenced data in the cloud paused cloud-garbage-collection 5 Write updated snapshot data to the cloud paused snapshot-writeback 6 Update SmartLink file formats paused smartlink-upgrade 7 Add data to CloudPools cache paused cache-pre-populate 959 paused archive 960 paused archive 961 paused archive 962 paused archive 964 paused archive 965 paused archive 966 paused archive 967 paused archive 968 paused archive ---------------------------------------------------------------------------------------
Isilon-1# top -n 5 PID USERNAME THR PRI NICE SIZE RES STATE C TIME WCPU COMMAND 87857 root 124 20 0 588M 180M nanslp 4 1723.5 805.81% isi_cpool_d 3455 root 28 98 r150 397M 87M sigwai 10 4216.3 69.34% nfs 18378 root 6 20 0 122M 72M uwait 9 53:18 68.36% isi_job_d 3313 root 49 98 r150 1019M 684M sigwai 14 7403.0 66.16% lwio 51167 root 6 20 0 94M 42M uwait 26 76:02 22.36% isi_job_d ...
Cause
某些作業 （例如快取寫回和快取失效） 會在背景中執行，不會直接與任何執行中的 CloudPools 工作相關。暫停 CloudPools 工作並不會阻止這些作業執行。這些線程將繼續運行並導致高 CPU 利用率。
若要確認這一點，請在監控 CPU 使用率時，暫停快取寫回和快取失效作業。isi_cpool_d CPU 使用率在暫停後應該會迅速下降。Isi_cpool_d，一旦恢復運營，CPU 利用率就會攀升。
若要暫停 CloudPools 作業：
# isi cloud jobs pause cache-writeback # isi cloud jobs pause cache-invalidation
若要恢復 CloudPools 作業：
# isi cloud jobs resume cache-invalidation # isi cloud jobs resume cache-writeback
Resolution
不建議長時間暫停緩存寫回和緩存失效操作。各種未完成的任務和操作累積並放大了問題。
由寫回或緩存失效導致的高 CPU 利用率可能表示發生了大量緩存。通常是因為大量數據正在存檔和內聯召回。這可能是由於檔池策略中編寫的存檔條件編寫不當所導致的。在不考慮訪問時間的情況下進行存檔可能會導致活動檔的緩存過多。
這是將資料歸檔至 ECS CloudPools 的寫入不佳檔案集區原則範例。請注意，指定路徑內的任何資料會立即歸檔至 CloudPools：
--------------------------------------------------------------------------------
Name: Bad ECS Cloud Policy
Description: Tier to ECS
CloudPools State: OK
CloudPools Details:
Apply Order: 3
File Matching Pattern: Path == APPS/SeaShoreVideo (begins with)
OR
Path == APPS/OceanArchive (begins with)
Set Requested Protection: -
Data Access Pattern: -
Enable Coalescer: -
Enable Packing: -
Data Storage Target: -
Data SSD Strategy: -
Snapshot Storage Target: -
Snapshot SSD Strategy: -
Cloud Pool: EMC ECS Pool
Cloud Compression Enabled: Yes
Cloud Encryption Enabled: No
Cloud Data Retention: 1W
Cloud Incremental Backup Retention: 5Y
Cloud Full Backup Retention: 5Y
Cloud Accessibility: cached
Cloud Read Ahead: partial
Cloud Cache Expiration: 1D
Cloud Writeback Frequency: 9H
ID: Good ECS Cloud Policy
--------------------------------------------------------------------------------
這是正確編寫的檔池策略的示例，該策略可容納活動檔和最近訪問的檔。請注意，此原則包含存取時間準則，因此只有 5 週 5 天後未存取的資料會歸檔至 CloudPool。
--------------------------------------------------------------------------------
Name: Good ECS Cloud Policy
Description: Tier to ECS
CloudPools State: OK
CloudPools Details:
Apply Order: 3
File Matching Pattern: Accessed Time > 5W5D AND Path == APPS/SeaShoreVideo (begins with)
OR
Accessed Time > 5W5D AND Path == APPS/OceanArchive (begins with)
Set Requested Protection: -
Data Access Pattern: -
Enable Coalescer: -
Enable Packing: -
Data Storage Target: -
Data SSD Strategy: -
Snapshot Storage Target: -
Snapshot SSD Strategy: -
Cloud Pool: EMC ECS Pool
Cloud Compression Enabled: Yes
Cloud Encryption Enabled: No
Cloud Data Retention: 1W
Cloud Incremental Backup Retention: 5Y
Cloud Full Backup Retention: 5Y
Cloud Accessibility: cached
Cloud Read Ahead: partial
Cloud Cache Expiration: 1D
Cloud Writeback Frequency: 9H
ID: Bad ECS Cloud Policy
--------------------------------------------------------------------------------
CPU 高isi_cpool_d率的其他原因可能會因叢集組態、設定和程式碼層級而有所不同。如需協助，請聯絡 Dell 技術支援部門。
Affected Products
PowerScale OneFSProducts
Isilon, Isilon SmartPoolsArticle Properties
Article Number: 000214130
Article Type: Solution
Last Modified: 04 Mar 2025
Version: 2
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