OSwatcher作为Oracle官方推荐的OS层面运行状态检测的脚本工具。在Exadata是默认已经安装。
但是Exadata是如何在系统启动后，自动启动OSwatcher呢？我们如何去修改OSwatcher的参数，来调整监控和日志保存的策略呢？
本文正是介绍，从系统启动到OSwatcher运行，中间经历过的脚本调用，以及如何修改OSwatcher参数的。
1. 首先检查rc.local文件，可以发现/etc/rc.d/rc.Oracle.Exadata
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# vi /etc/rc.d/rc.local
-----------------------------------------
########### BEGIN DO NOT REMOVE Added by Oracle Exadata ###########
if
[ -x /etc/rc.d/rc.Oracle.Exadata ]; then
. /etc/rc.d/rc.Oracle.Exadata <<<<<<<<<<<<<<<<<<<<<<This script will be run automaticlly, when the OS starts
fi
########### END DO NOT REMOVE Added by Oracle Exadata ###########
-----------------------------------------
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2. 查看rc.Oracle.Exadata，找到/opt/oracle.cellos/vldrun -all
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# vi /etc/rc.d/rc.Oracle.Exadata
-----------------------------------------
# Perform validations step
/opt/oracle.cellos/vldrun -all <<<<<<<<<<<<<<<<<<<<<<This script will be run automaticlly, when the OS starts
-----------------------------------------
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3. 检查当前OSwatcher的设定，每15秒收集一次，生成的日志保存168小时（7天），bzip2的压缩模式，最大日志尺寸是3G
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# ps -ef | grep OSW
root
15962
1
0
04
:
00
pts/
1
00
:
00
:
00
/bin/ksh ./OSWatcher.sh
15
168
bzip2
3
root
15994
15962
0
04
:
00
pts/
1
00
:
00
:
00
/bin/ksh ./OSWatcherFM.sh
168
3
root
16272
9529
0
04
:
00
pts/
1
00
:
00
:
00
grep OSW
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4. 脚本/opt/oracle.cellos/vldrun会调用oswatcher脚本来启动oswatcher
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# ls -al /opt/oracle.cellos/validations/init.d/oswatcher
-r-xr-x---
1
root root
5128
Aug
19
03
:
39
oswatcher
# chmod
750
oswatcher <<<<<<<<<<<<<<<<<<<<<<<<Change the right, then we can edit it
as
per our expected.
# ls -al oswatcher
-rwxr-x---
1
root root
5128
Aug
19
03
:
39
oswatcher
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5. 检查当前oswatcher脚本中的设定，并修改（本次修改将原有的最大保存3G的日志，修改为最大日志尺寸为4G）
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# vi oswatcher
----------------------------------------
fi
(umask
0037
; nohup ./startOSW.sh
15
168
bzip2
4
>/
var
/log/cellos/start_oswatcher.log
2
>&
1
&)& <<<<<<<<<<<<change
this
part of the script, will let the script run
as
per our expected.
# Dont direct logs to startosw.log. It grows too large and fast
# (nohup ./startOSW.sh
15
168
bzip2
3
>/dev/
null
2
>&
1
&)&
popd >/dev/
null
----------------------------------------
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6. 停止oswatcher
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#/opt/oracle.oswatcher/osw/stopOSW.sh
# ps -ef | grep OSW
root
10528
9529
0
03
:
59
pts/
1
00
:
00
:
00
grep OSW
7
. 手动启动oswatcher
# /opt/oracle.cellos/vldrun -script oswatcher
Logging started to /
var
/log/cellos/validations.log
Command line
is
./validations/bin/vldrun.pl -quiet -script oswatcher
Run validation oswatcher - PASSED
The
each
boot completed
with
SUCCESS
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8.再次检查OSwatcher的设定，最大日志尺寸已经改为4G
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# ps -ef|grep OSW
root
109041
1
0
03
:
37
pts/
1
00
:
00
:
00
/bin/ksh ./OSWatcher.sh
15
168
bzip2
4
root
109073
109041
0
03
:
37
pts/
1
00
:
00
:
00
/bin/ksh ./OSWatcherFM.sh
168
4
root
109348
59019
0
03
:
37
pts/
1
00
:
00
:
00
grep OSW
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更对oswatcher细节，可以参考以下官方文档(注：目前文档1585389.1中已经记录如何永久修改exadata上osw的设定， 但是本人测试的时候，该文档并没有相关记录)
OSWatcher does not Retain Data for the Full Retention Period Specified (Doc ID 1585389.1)
OSWatcher Black Box (Includes: [Video]) (Doc ID 301137.1)
