PowerScale OneFS：故障的 DIMM 導致後端延遲

Summary: 節點中的 Dual inline memory module （DIMM） 故障可能會導致後端延遲。

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Symptoms

用戶端回報效能不佳，且由於以下原因，單一節點的負載和 CPU 使用率很高 isi_mca_dump 過程。 

# isi_for_array -s uptime
xxxxx-1:   1:37AM  up 216 days,  9:16, 1 users, load averages: 7.95, 6.69, 6.87
xxxxx-2:   1:37AM  up 216 days,  9:17, 2 users, load averages: 12.69, 7.75, 6.18
xxxxx-3:   1:37AM  up 216 days,  9:13, 0 users, load averages: 9.18, 5.96, 5.79
xxxxx-4:   1:37AM  up 128 days,  4:51, 1 users, load averages: 9.49, 6.47, 5.90
xxxxx-5:   1:37AM  up 216 days,  9:13, 0 users, load averages: 10.18, 6.25, 6.06
xxxxx-6:   1:37AM  up 216 days,  9:13, 0 users, load averages: 9.10, 6.52, 5.58
xxxxx-7:   1:37AM  up 216 days,  9:13, 0 users, load averages: 5.99, 4.45, 4.14
xxxxx-8:   1:37AM  up 90 days, 11:17, 2 users, load averages: 15.96, 26.64, 28.16 
xxxxx-9:   1:37AM  up 216 days,  9:13, 1 users, load averages: 5.99, 4.88, 5.12
xxxxx-10:  1:37AM  up 216 days,  9:13, 1 users, load averages: 12.52, 7.48, 6.28

# isi_for_array -n8 top
xxxxx-8: last pid: 75601;  load averages: 20.75, 19.19, 23.94  up 90+11:21:47    01:42:08
xxxxx-8: 135 processes: 5 running, 129 sleeping, 1 zombie
xxxxx-8:
xxxxx-8: Mem: 1310M Active, 69G Inact, 157G Wired, 96G Buf, 5078M Free
xxxxx-8: Swap:
xxxxx-8:
xxxxx-8:
xxxxx-8:   PID USERNAME       THR PRI NICE   SIZE    RES STATE   C   TIME    WCPU COMMAND
xxxxx-8: 73859 root             1 103    0   122M 10148K CPU19  19   6:00 100.00% isi_mca_dump
xxxxx-8: 74626 root             1 103    0   122M 10172K CPU26  26   3:01  98.97% isi_mca_dump

Cause

機器檢查架構 （MCA） 是 CPU 和記憶體的錯誤報告機制。由於 DIMM 故障，寫入受影響節點或從受影響節點讀取的資料出現延遲。此延遲可能會導致後端延遲，最終影響整體叢集效能。在最糟的情況下，延遲可能會導致資料無法使用 （DU） 的情況。

Resolution

更換故障的 DIMM。

Affected Products

Isilon

Products

Isilon, PowerScale OneFS
Article Properties
Article Number: 000069748
Article Type: Solution
Last Modified: 01 تموز 2026
Version:  7
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