New to AIX: How do I setup high availability on an AIX System Post: 303038826

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Top Forums UNIX for Beginners Questions & Answers New to AIX: How do I setup high availability on an AIX System Post 303038826 by Neo on Saturday 14th of September 2019 10:29:46 PM

09-14-2019

Administrator

Quote:

Originally Posted by mathisecure

I am new to AIX but not new to unix.

I have an interview for an AIX systems admin position and I know they want someone who has knowledge of High Availability, Failover and LPARs

From my research so far, It appear powerha is used to setup high availability and failover on Power systems but is this the case for all AIX systems or does it differ?

I found documentation on IBM Knowledge Center for setting up High availability using PowerHA but I do not know if this would be the process on all aix systems.

This is the core dilemma you are in.....

You have an interview for a position for someone who has knowledge, and I assume experience, for a technology you are not qualified in; and you are doing your homework to try to quickly learn something from reading about it on line, but which you have no hands on experience.

I think it is best for you to simply tell the people who are interviewing you that you have no hands on experience in the technology; but are willing and able to learn it if they hire you and provide valid references from past employers (or teachers) who will attest to the fact you are good at learning quickly on the job (OJT).

It is must better to be honest with people; instead of trying to fool them. That is my strong advice.

I have interviewed many, many people for tech positions over the years; and it is really easy to spot those who have "crammed for the exam", like you are doing.

As a side note, when I was a university student, I almost never crammed for exams or pulled "all nighters" before tests. I just learned the material as well as I could when the homework was assigned, and the lessons were taught, and the night before the exams I generally when for a nice Italian meal, has a "romantic night" with my girlfriend(s), and got a good night sleep. I graduated second in my class (should have graduated at the top, but the guy who "squeaked pass me" was the son of a powerful tenured professor in the same department .... ), with a 3.81 GPA in Electrical Engineering (Magna Cum Laude) at a top private university in the US. The reason I am mentioning this is that my life has been full of success and experience tells me the that honesty and integrity are the most importantly keys to success.

So, if you want a job, be honest and interview with integrity,

Do not try to pretend you have experience in an area where you have no experience.

And never fake references and experience, as so many people do.

Having said that, it is good to do your homework ahead of time, which you have done; by doing your own research and asking questions in forums like this one. On the other hand, experience here over the decades is that our members do not like helping anyone "cram" for interview questions for a job they are not qualified for:

PS: You can search the forums (or visit the various similar thread at the bottom of this page) for more information / posts @unix.com on AIX high availability.

Neo

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LEARN ABOUT HPUX

lcpu_attr

lcpu_attr(5)							File Formats Manual						      lcpu_attr(5)

NAME

       lcpu_attr - dynamically enable or disable LCPU attribute of the default processor set

VALUES

   Fail Safe
   Default
       the LCPU attribute of the default processor set is disabled

   Allowed values
       or

DESCRIPTION

       This  tunable  dynamically  enables or disables the logical processor (LCPU) attribute in the default processor set.  On systems supporting
       hyper-threading technology, each hyper-thread is represented as an LCPU.

       When the LCPU attribute is enabled, the processor cores in the default processor have hyper-threading enabled.  If the  LCPU  attribute	is
       disabled, the physical processors in the default processor set behave as single threaded processor cores.

       See pset_setattr(2) for information about managing the LCPU attribute in processor sets other than the default processor set.

   Who Is Expected to Change This Tunable?
       System administrators that wish to change hyper-threading ability in the default processor set.

   Restrictions on Changing
       The tunable has no effect on platforms that do not have hyper-threading capability or systems with hyper-threading disabled at the firmware
       level.  On systems that support hyper-threading, the firmware feature must be enabled to dynamically enable/disable the LCPU  attribute	in
       the default processor set.

   When Should the Tunable Be Turned On?
       The  tunable  should  be  turned on to enable the LCPU attribute in the default processor set to take advantage of hyper-threading.  If the
       applications running on the system see performance benefits, the LCPU attribute should remain enabled.

   What Are the Side Effects of Turning the Tunable On?
       Some workloads may experience performance degradation when the LCPU attribute is enabled.

   When Should the Tunable Be Turned Off?
       Some applications may experience performance degradation or may not see any performance benefits from using hyper-threading.  In this case,
       this tunable should be turned off.

   What Are the Side Effects of Turning the Tunable Off?
       With LCPU turned off, applications may not take advantage of hyper-threading.

   What Other Tunables Should Be Changed at the Same Time?
       None.

WARNINGS

       All  HP-UX kernel tunable parameters are release specific.  This parameter may be removed or have its meaning changed in future releases of
       HP-UX.

       Installation of optional kernel software, from HP or other vendors, may cause changes to tunable  parameter  values.   After  installation,
       some  tunable  parameters may no longer be at the default or recommended values.  For information about the effects of installation on tun-
       able values, consult the documentation for the kernel software being installed.	For information about optional kernel  software  that  was
       factory installed on your system, see at

AUTHOR

       was developed by HP.

SEE ALSO

       psrset(1M), pset_assign(2), pset_bind(2), pset_create(2), pset_ctl(2), pset_destroy(2), privgrp(4).

							     Tunable Kernel Parameters						      lcpu_attr(5)