Dell Unity: uDoctor Scheduled Tasks Trigger High CPU Utilization

Summary: A specific Service Data Collection (SDC) plugin used by APEX AIOps may intermittently trigger multiple PostgreSQL (PSQL) queries during uDoctor scheduled tasks, resulting in high CPU utilization on the Primary Storage Processor for approximately 15 minutes. This issue does not affect manually generated Service Data Collections and is resolved in Unity OE version 5.0.3. ...

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Symptoms

CPU utilization on the primary Storage Processor reaches 90-100% at the same time each day and remains high for around 15 minutes.

Cause

The APEX AIOps team has identified an issue where a specific Service Data Collection (SDC) plugin may intermittently trigger multiple PostgreSQL (PSQL) commands.


When this occurs, the resulting PSQL queries can cause significant CPU utilization on the Primary Storage Processor (SP), which is responsible for running uDoctor tasks.

 

Note: This behavior does not occur when a Service Data Collection is generated manually. The issue only affects uDoctor scheduled tasks, including the daily log collections generated for APEX AIOps.

Resolution

This issue is resolved in Unity OE version 5.0.3, which includes a code fix to prevent the excessive CPU utilization caused by the affected uDoctor scheduled tasks.


For additional information about Dell Unity OE versions and release schedules, refer to the Dell Unity OE Matrix knowledge article.

Additional Information

To confirm that this issue is present, run the following commands in the Unisphere CLI from an SSH terminal:


/spX/EMC/backend/log_shared/EMCSystemLogFile.log 

service@spb:~# tailf 00_emc_backend_log_shared/EMCSystemLogFile.log | grep -i udoctor
" 2020-02-16 T 13:03:12 .155Z" "Array_spb@Serial_Number" "Kittyhawk_safe" "9134" "unix/spb/root" "INFO" "1:115000d" :: " Internal Information only. PSM File "udoctor" Deleted. " :: Category=System Component=psm TimeZone=UTC

"2020-02-17 T 13:03:12 .944Z" "Array_spb@Serial_Number" "Kittyhawk_safe" "9134" "unix/spb/root" "INFO" "1:115000d" :: " Internal Information only. PSM File "udoctor" Deleted. " :: Category=System Component=psm TimeZone=UTC

UEMCLI Metrics (Historical):

service@spb:~# uemcli -no /metrics/value/hist -path sp.*.cpu.summary.utilization show -interval 60 -from "2020-02-16 12:59:00" -to "2020-02-16 13:59:00"
Timestamp           |SP        |summary
                    |          |CPU
                    |          |Util %
--------------------+----------+-------
2020-02-16 13:02:00 |spa       |  13.93
                    |spb       |  66.47
2020-02-16 13:03:00 |spa       |  12.49
                    |spb       |  90.96
2020-02-16 13:04:00 |spa       |  12.94
                    |spb       |  92.63
2020-02-16 13:05:00 |spa       |  11.91
                    |spb       |  93.29
2020-02-16 13:06:00 |spa       |  5.072
                    |spb       |  92.28
2020-02-16 13:07:00 |spa       |  2.497
                    |spb       |  90.06
2020-02-16 13:08:00 |spa       |  2.452
                    |spb       |  92.38
2020-02-16 13:09:00 |spa       |  2.527
                    |spb       |  95.68
2020-02-16 13:10:00 |spa       |  2.441
                    |spb       |  98.36
2020-02-16 13:11:00 |spa       |  2.845
                    |spb       |  97.170
2020-02-16 13:12:00 |spa       |  2.466
                    |spb       |  97.096
2020-02-16 13:13:00 |spa       |  2.479
                    |spb       |  97.732
2020-02-16 13:14:00 |spa       |  2.469
                    |spb       |  98.023
2020-02-16 13:15:00 |spa       |  2.362
                    |spb       |  96.391
2020-02-16 13:16:00 |spa       |  2.697
                    |spb       |  65.053
 
UEMCLI Metrics (Real Time): 
service@spb:~# uemcli -no /metrics/value/rt -path sp.*.cpu.summary.utilization show -interval 10
Timestamp           |SP        |summary
                    |          |CPU
                    |          |Util %
--------------------+----------+-------
2020-02-17 13:03:20 |spa       |  0.929
                    |spb       |  90.810
2020-02-17 13:03:30 |spa       |  1.928
                    |spb       |  90.980
2020-02-17 13:03:40 |spa       |  2.417
                    |spb       |  90.537
2020-02-17 13:03:50 |spa       |  1.912
                    |spb       |  91.601
2020-02-17 13:04:00 |spa       |  2.124
                    |spb       |  93.625
2020-02-17 13:04:10 |spa       |  3.828
                    |spb       |  92.191

Affected Products

Dell Unity 300, Dell EMC Unity 300F, Dell EMC Unity 350F, Dell EMC Unity 400, Dell EMC Unity 400F, Dell EMC Unity 450F, Dell EMC Unity 500, Dell EMC Unity 500F, Dell EMC Unity 550F, Dell EMC Unity 600, Dell EMC Unity Family

Products

Dell EMC Unity 600F, Dell EMC Unity 650F, Dell EMC Unity Family |Dell EMC Unity All Flash, Dell EMC Unity Family, Dell EMC Unity Hybrid
Article Properties
Article Number: 000058581
Article Type: Solution
Last Modified: 17 Jul 2026
Version:  7
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