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Steps To Recover Solaris Customization Kernel
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Over the past few weeks, a number of readers have reported that they have experience optimizing the Solaris kernel. For information on the required tuning of Solaris kernel parameters, their values, and how to set the values, see the following description. There are two different allocation methods: writing to the system file / etc / and writing to the project file / etc /. Implement these customization methods as needed in your installation environment.
Optimize this Solaris kernel. Apply the configurable parameters in this way. For more information Edit the file / etc / system / etc / system. Use the kernel debugger (kmdb), the kmdb command. Use the flip debugger (mdb) command. IP Settings Chapter 4, Internet Protocol Suite Tunab Extra Series 1 July 30, 2021
The following are the different uses for custom recommendations.
File / Etc / System
The content of / etc / system provides a static mechanism for configuring kernel values.Parameter. The values specified in this file are applied at boot time and areapplicable. Changes made to manual save are not appliedworking configuration until the system is restarted. Skip
you must set all values before settingThe parameters are usually calculated.
Example – defining a parameter in / etc / system
The resulting entry from / etc / system sets the maximum ZFS ARC value ( zfs_arc_max ) to 30 GB.
install zfs: zfs_arc_max = 0x780000000
Recovering an erroneous value
Сд Make a copy of / etc / system if you change the file before the file, so most of youcan easily recover from a wrong value. For example CP:
# / etc / system /etc/system.good
If the value defined in the / etc / system file forces the systemdoes not boot, you can restore it with the following command:
ok, trunk -a
This command forces the marketplace system to prompt for the name associated with variousFiles used in the download process. Press the return key to returnDefault values are requested for my filename / etc / system . If is the real name of the system file [/ etc / system]: Prompt, enter the name of the entire correct / etc / system file or / dev / null :
Plan file name [/ etc / system]: /etc/system.good
If / dev / null is correct, this path will force the system to try to read along the pathuser / dev / null for all configuration information. Since this file was empty, the systemuses the default setting. After starting the system, this / etc / system can be corrected.
AdditionalFor more information on system recovery, see the manual for the administrative module: Basic Administration.
Kmdb
command
How to setup a NetBackup project on Solaris?
First, check to see if a NetBackup project already exists on this server: if your system does not currently have a NetBackup project configured, read the same article below for a detailed explanation of the steps required to set up a NetBackup project on Solaris.
kmdb is an interactive kernel debugger with precise general syntax such as mdb .One interactive kernel debugger that needs to be improved is that we can set breakpoints. WhenIn addition, you can check the data at runtime.kernel code.
kmdb can be easily downloaded and downloaded on demand. You don’t buy too muchReboot the system to debug the kernel as some have done kadb .
Mdb Command
The mdb modular debugger is great for Solaris debuggers because it is easy to use.expandable. There is a programming API that allows you to compile modules to actually work.desired tasks as part of the debugger.
mdb also includes the phone number of the desired usability features, not to mention command line editing, commandHistory, built-in pager output, format check, order and conveyor. mdb is usually the recommended attackA debugger for the kernel is available.
Example – Using mdb to display information
Displays a specific overview of system memory usage. For example:
How to tune the kernel parameters in Solaris?
There are two different methods of fine tuning: writing to the / etc / system files and working in the / etc / project files. Implement one of these optimization techniques as appropriate for your installation environment. If the parameters listed in the table have already been set, proceed as follows.
# mdb -kLoadable modules: [unix genunix specfs dtrace zfs sd pcisch sockfs ip Hook neti sctp arpusba fcp fctl doctor lofs cpc crypto random fcip nca logindmux ptm ufs sppp nfs]> :: memstatSitemap Pages MB% Total------------ ---------------- ---------------- ----Core 95193743 37%ZFS file data 96308 752 38%Anon 28,132,219 11%Exec combined with Libs 1870 14 1%Page cache 1465 twelve 1%Free (cash-list) 4242 thirty three 2%Free (Freelist) 28,719,224 11%Total 255,929 1999Physics 254 495 1988> $ q
For more information on using the modular debugger, see the Solaris Modular Debugger Guide. Usage
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if possible, kmdb or mdb Debugger, course name prefix notnecessary. Once a good module is loaded, its symbols share a common namespacewith a kernel of kernel symbols and all previously loaded module symbols.
For example, ufs: ufs_WRITES will probably be available as ufs_WRITES in every debugger (assumingloadThe UFS module is already available). ufs: prefix is routed when set to / etc / system file.
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