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Exalytics: RAID Checks During High Application Activity Causes System Hang (Doc ID 2691782.1)

Last updated on JULY 17, 2020

Applies to:

Exalytics In-Memory Machine X6-4 - Version All Versions and later
Information in this document applies to any platform.

Symptoms

High load on server is observed on Exalytics Server running EPM applications and system hangs periodically.

Disk utilization on NVMe flash memory devices is also at 99% and very high reads are seen on the server.

[oraxxx@pokcxxxx bin]$ uptime
03:40:26 up 6 days, 21:06, 1 user, load average: 202.63, 202.70, 200.77 <<<<<<<<<<<<<<<<

top - 03:21:39 up 6 days, 20:48, 2 users, load average: 201.80, 201.44, 196.11 <<<<<<<<<
Tasks: 1912 total, 53 running, 1856 sleeping, 0 stopped, 2 zombie
Cpu(s): 0.0%us, 11.5%sy, 0.2%ni, 87.6%id, 0.7%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 2113687352k total, 1354254140k used, 759433212k free, 794004k buffers
Swap: 100990972k total, 12564812k used, 88426160k free, 274529456k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
52327 root 25 5 0 0 0 R 99.9 0.0 67:24.24 md10_resync
 4145 root 20 0 0 0 0 S 55.0 0.0 6:06.85 md11_raid1
 4171 root 20 0 0 0 0 S 31.9 0.0 6:10.61 md6_raid1
 4151 root 20 0 0 0 0 S 20.8 0.0 6:05.32 md3_raid1
52287 root 25 5 0 0 0 D 18.5 0.0 1:22.01 md11_resync



Cause

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In this Document
Symptoms
Cause
Solution
References


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