Isilon OneFS：出现故障的 DIMM 导致后端延迟
Summary: 节点中的内存模块 （DIMM） 出现故障可能会导致后端延迟。
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Symptoms
客户端报告性能不佳，并且由于进程isi_mca_dump，一个节点上的负载和 CPU 利用率很高。
# 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
机器检查体系结构 （MCA） 是 CPU 和内存的错误报告机制。由于 DIMM 故障，向受影响节点写入或从中读取的数据存在延迟。此延迟可能会导致后端延迟，并最终影响整体群集性能。在最坏的情况下，延迟可能会导致数据不可用 （DU） 的情况。
Resolution
更换故障 DIMM。
Affected Products
IsilonProducts
Isilon, PowerScale OneFSArticle Properties
Article Number: 000069748
Article Type: Solution
Last Modified: 26 جمادى الآخرة 1447
Version: 6
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