Isilon OneFS: En defekt DIMM som forårsaker ventetid for backend

Summary: En defekt minnemodul (DIMM) i en node kan forårsake ventetid for backend.

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Symptoms

Klienter rapporterer om dårlig ytelse, og det er høy belastning og CPU-utnyttelse på én node på grunn av isi_mca_dump prosessen. 
 

# 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

Machine Check Architecture (MCA) er en feilrapporteringsmekanisme for CPU og minne. På grunn av feil DIMM er det en forsinkelse i dataene som skrives til eller leses fra den berørte noden. Denne forsinkelsen kan forårsake ventetid for backend og til slutt påvirke den generelle klyngeytelsen. I verste fall kan ventetiden føre til en data utilgjengelig (DU)-situasjon.

Resolution

Sett inn den defekte DIMM-en.

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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