一、基礎環境

作業系統： Red Hat Enterprise Linux Server release 7.6 (Maipo)

資料庫： Oracle 12.1.0.2 RAC

二、問題描述

2022 年 11 月 18 日一套業務系統主機因硬體故障發生重啟，主機重啟後資料庫節點 1 無法正常啟動，節點 2 可以正常對外提供服務。節點 1css 程式無法啟動到 real time ，關閉 EDR 相關的 titanagent 服務後，重啟作業系統，可以正常啟動叢集和資料庫。

三、分析過程

1 、檢查主機重啟後叢集狀態

[[email protected]]#crsctl status res -t -init

--------------------------------------------------------------------------------

NAME TARGET STATE SERVER STATE_DETAILS

--------------------------------------------------------------------------------

Cluster Resources

--------------------------------------------------------------------------------

ora.asm

1 ONLINE OFFLINE

ora.cluster_interconnect.haip

1 ONLINE OFFLINE

ora.crf

1 ONLINE ONLINE nadb01

ora.crsd

1 ONLINE OFFLINE

ora.cssd

1 ONLINE OFFLINE STARTING

ora.cssdmonitor

1 ONLINE ONLINE nadb01

ora.ctssd

1 ONLINE OFFLINE

ora.diskmon

1 OFFLINE OFFLINE

ora.evmd

1 ONLINE OFFLINE

ora.gipcd

1 ONLINE ONLINE nadb01

ora.gpnpd

1 ONLINE ONLINE nadb01

ora.mdnsd

1 ONLINE ONLINE nadb01

cssd 程式啟動異常。

2 、檢查資料庫叢集日誌

[gpnpd(231513)]CRS-2328:GPNPD started on node zadb03. 2022-11-18 10:56:09.210: [cssd(231620)]CRS-1713:CSSD daemon is started in clustered mode 2022-11-18 10:56:09.219: [cssd(231620)]CRS-1656:The CSS daemon is terminating due to a fatal error; Details at (:CSSSC00011:) in /u01/app/11.2.0.4/grid/log/newdb01/cssd/ocssd.log 2022-11-18 10:56:11.034: [ohasd(229354)]CRS-2767:Resource state recovery not attempted for 'ora.diskmon' as its target state is OFFLINE

從日誌看]CRS-1656:The CSS daemon is terminating due to a fatal error; Details at (:CSSSC00011:) in /u01/app/12.1.0.2/grid/log/newdb01/cssd/ocssd.log

檢查 ocssd日誌

2022-11-18 10:56:09.210: [    CSSD][3219912512]clssscmain: Starting CSS daemon, version 11.2.0.4.0, in (clustered) mode with uniqueness value 1668740169
2022-11-18 10:56:09.210: [    CSSD][3219912512]clssscmain: Environment is production                                                                    
2022-11-18 10:56:09.210: [    CSSD][3219912512]clssscmain: Core file size limit extended                                                                
2022-11-18 10:56:09.212: [    CSSD][3219912512]clssscmain: GIPCHA down 0                                                                                
2022-11-18 10:56:09.213: [    CSSD][3219912512]clssscGetParameterOLR: OLR fetch for parameter logsize (8) failed with rc 21                             
2022-11-18 10:56:09.213: [    CSSD][3219912512]clssscExtendLimits: The current soft limit for file descriptors is 65536, hard limit is 65536            
2022-11-18 10:56:09.213: [    CSSD][3219912512]clssscExtendLimits: The current soft limit for locked memory is 4294967295, hard limit is 4294967295     
2022-11-18 10:56:09.213: [    CSSD][3219912512]clssscGetParameterOLR: OLR fetch for parameter priority (15) failed with rc 21                           
2022-11-18 10:56:09.213: [    CSSD][3219912512]clssscSetPrivEnv: Setting priority to 4                                                                  
2022-11-18 10:56:09.219: [    CSSD][3219912512]clssscSetPrivEnv: unable to set priority to 4                                                         
2022-11-18 10:56:09.219: [    CSSD][3219912512]SLOS: cat=-2, opn=scls_set_priority_realtime, dep=1, loc=setsched                                        
unable to escalate to real time

從ocss日誌中可以看到ocssd程式啟動時無法得到較高的優先順序，無法啟動到real time。

Linux: GI OCSSD Fails to Start After cgroups Setting Change (Doc ID 1577784.1) 描述與此現象高度相似

Deployed Puppet which created a new cgroup-configuration by default.
ls /cgroups/cpu.rt_*
/cgroups/cpu.rt_period_us /cgroups/cpu.rt_runtime_us
cat /cgroups/cpu.rt_*
1000000
950000
cat /cgroups/sysdefault/cpu.rt_*
1000000
0                      ====>> 0 
 
SOLUTION
Option 1: Restore the default value and reboot the node:
cat /etc/cgconfig.conf
mount {
memory = /cgroups;
cpu = /cgroups;
}
group lu-adm {
cpu {
cpu.shares = 50;
}
memory {
memory.memsw.limit_in_bytes = 500m;
memory.limit_in_bytes = 200m;
}
}
group sysdefault {
cpu {
cpu.shares = 1024;
cpu.rt_period_us = 1000000;
cpu.rt_runtime_us = 950000; ====>> changed from 0 back to default
}
}
Workaround is to clear cgroup setting through 'cgclear' after consulting sysadmin.
cgroup-configuration file changed in RHEL 6 and later versions
  RHEL 6 cd /sys/fs/cgroup/cpuacct/user.slice
         cat cpu.rt_period_us
  RHEL 7 path i.e File location : ls /sys/fs/cgroup/cpu/cpu.rt_*
The file is not availble in all OS -- check with the OS Vendor for details.

3、檢查作業系統相關配置和服務

[[email protected] ~]# cat /etc/cgconfig.conf
cat: /etc/cgconfig.conf: No such file or directory

沒有cgconfig.conf 檔案

[[email protected] ~]# ls /sys/fs/cgroup/cpu/cpu.rt_*

/sys/fs/cgroup/cpu/cpu.rt_period_us /sys/fs/cgroup/cpu/cpu.rt_runtime_us
[[email protected] ~]#
[[email protected] ~]# cat /sys/fs/cgroup/cpu/cpu.rt_period_us
1000000
[[email protected] ~]# cat /sys/fs/cgroup/cpu/cpu.rt_runtime_us
950000
[[email protected]~]#

cpu.rt_period_us和cpu.rt_runtime_us設定的就是推薦值950000

該文件《Linux: GI OCSSD Fails to Start After cgroups Setting Change (Doc ID 1577784.1)》的解決方案不適用。

4、reahat官方關於CPU的相關設定說明

How to configure a RHEL 7 or RHEL 8 system to be able to run programs requiring Real-Time Scheduling

當CPUAccounting引數enabled時，將不能建立real-time程式。排查system.conf配置檔案發現並沒有開啟CPUAccounting引數

5、檢查作業系統CPU Accounting、CPUQuots等

[[email protected] ~]# grep DefaultCPUAccounting /etc/systemd/system.conf
#DefaultCPUAccounting=no

但是在titanagent.service服務檔案中發現配置了CPUQuota=50%

[[email protected]~]# cat /usr/lib/systemd/system/titanagent.service
[Unit]
Description=titanagent
After=network.target
[Service]
User=root
CPUQuota=50%
Type=forking
PIDFile=/var/run/titanagent.pid
ExecStartPre=/bin/bash -c “/titan/agent/titanagent -s”
ExecStart=/bin/bash -c “/titan/agent/titanagent -d -b /etc/titanagent”
ExecStop=/bin/bash -c “/titan/agent/titanagent -s”
ExecReload=/bin/bash -c “/titan/agent/titanagent -d -b /etc/titanagent”
PrivateTmp=no
Restart=always
RestartSec=60s
TimeoutSec=20s
TimeoutStopSec=30s
[Install]
WantedBy=multi-user.target

CPUQuota引數會隱性開啟CPUAccounting

6、禁用titanagent.service後，重啟主機叢集啟動正常

-the end-

Oracle 12c RAC CSSD程式無法啟動real time模式

3、檢查作業系統相關配置和服務

4、reahat官方關於CPU的相關設定說明

5、檢查作業系統CPU Accounting、CPUQuots等

6、禁用titanagent.service後，重啟主機叢集啟動正常

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