Isilon OneFS: Arka uç gecikmesine neden olan arızalı bir DIMM

Summary: Bir düğümdeki arızalı bir bellek modülü (DIMM) arka uç gecikmesine neden olabilir.

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Symptoms

İstemciler düşük performans bildiriyor ve isi_mca_dump işlem nedeniyle bir düğümde yüksek yük ve CPU kullanımı var. 
 

# 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

Makine Kontrol Mimarisi (MCA), CPU ve bellek için bir hata raporlama mekanizmasıdır. Arızalı DIMM nedeniyle, etkilenen düğüme yazılan veya bu düğümden okunan verilerde gecikme olur. Bu gecikme arka uç gecikmesine neden olabilir ve sonunda genel küme performansını etkileyebilir. En kötü senaryolarda gecikme süresi, veri kullanılamaz (DU) durumuna yol açabilir.

Resolution

Arızalı DIMM'yi değiştirin.

Affected Products

Isilon

Products

Isilon, PowerScale OneFS
Article Properties
Article Number: 000069748
Article Type: Solution
Last Modified: 17 Dec 2025
Version:  6
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