Tuesday, February 21, 2012

Aix Interview Questions

Q 1.  What is Virtualization?

Q2   What is micropartitioning?

Q3   What is Shared pool processor? How it works?

Q4 What is vCpu? How you define the vCpu values( min , desired & max)? What is the importance of vCpu?

Q5 What is the importance of desired vCPU and max vCpu?

Q6  Scenario based questions; What could be the maximum value can be defined to vCPu for a lpar if managed systems has total 6 physical CPU?

Q7  Scenario 2:- If physical CPU defined as min 1, desired 2 & max 4 where as vCpu defined as min 1, desired 3 and max4, then how any logical cpu you will see on a lpar concerning  power5,6 and power7?

Q8:- following above scenario who system will dispatch or use the CPU cycles.?

Q9:- What is capped and uncapped processor? What is the entitled Capacity incase of capped and uncapped CPU with example?

Q10:- Scenario :- In case of uncapped processor how load will be distributed on each lpar? During  peak time or during demand of extra Cpu by the lpar how the hypervisor will distribute the CPU from free pool or shared pool? How it defines the priority of allocating extra CPU to heavily loaded Lpar? Again if Lpar is weight is 98 and other lpar weight is 105 then how cpu will be distributed by hypervisor and in what ratio?

Q11 Is there any formula to calculate the vCpu distribution by hypervisor?

Q12What is ASM? How it works?

Q13 What is shared memory processor? How it works?

Q13 What is ASE (Active Shared memory Expansion)? How it works.

 Q14 What is turbo core? How it works? What is the benefit of turbo core? Do all power7 have this feature? How to enable or disable turbo core?

Q15 What is the difference between Power4, Power5 Power6 and Power7?

Q16 What is the difference between Aix 5.1, 5.2 , 5.3 and Aix 6.1?

Come on do some home work yourself;  that's why I have not posted the answers... Wait for more question I will post only when I get some response on above question, drop your answers...






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35 comments:

  1. LavanyaFebruary 28, 2012 at 4:08 AM

    Q1:Virtualization, in computing, is the creation of a virtual (rather than actual) version of something, such as a hardware platform, operating system, a storage device or network resources.

    ReplyDelete
    Replies
    1. prabaharanMarch 14, 2013 at 1:57 PM

      Power means performance optimization with enhanced Risc
      the POWER4 processor in 2001, the first in the GIGA-Series, in 2001,used in both RS/6000 and AS/400 systems . Removed ISA
      the POWER5 processor in 2004, It is a dual-core processor with support for simultaneous multithreading with two threads
      the POWER6 processor in 2007, It also introduces the second generation of IBM ViVA, ViVA-2 (Virtual Vector Architecture). It is a dual-core design, power consumption
      the POWER7 processor in 2010, focusing more on power efficiency through multiple cores and simultaneous multithreading.

      Delete
  2. LavanyaFebruary 28, 2012 at 4:12 AM

    micropartitioning: With single available processor, it can be divided into as small as 0.01 micro granuals and it can allocated to the partion.So it is called as micropartitioning.

    ReplyDelete
  3. LavanyaFebruary 28, 2012 at 4:17 AM

    Shared pool processor: Shared pool has a number of processors in a pool, The free idle processor are used by uncapped partitions for extra CPU cycles.

    ReplyDelete
  4. LavanyaFebruary 28, 2012 at 4:25 AM

    VCpu:The virtual CPU or the virtual processor actually tells the operating system how many processor the server has in it.
    The minimum value is that without this no of processor, the partition will not boot.
    The desired value is that, upon booting the partition it will use this much value of processor for application utilization.
    The maximum value is that no of processors can be increased to maximum value using DLPAR without the application downtime.

    ReplyDelete
  5. LavanyaFebruary 28, 2012 at 4:34 AM

    Q6: 60

    ReplyDelete
  6. LavanyaFebruary 28, 2012 at 4:56 AM

    Q7: in Power5 and 6, The logical CPU is 6 and Power 7 it is 12.An enhancement in the POWER7 processor is the addition of the SMT4 mode to enable four instruction threads to execute simultaneously in each POWER7 processor core.
    So the desired value 3*4 is 12.

    ReplyDelete
  7. LavanyaFebruary 28, 2012 at 7:46 AM

    Q13:IBM’s POWER7™ systems with AIX® feature Active Memory™ Expansion, a new technology for expanding a system’s effective memory capacity. Active Memory Expansion employs memory compression technology to transparently compress in-memory data, allowing more data to be placed into memory and thus expanding the memory capacity of POWER7 systems. Utilizing Active Memory Expansion can improve system utilization and increase a system’s throughput.

    ReplyDelete
  8. LavanyaFebruary 28, 2012 at 7:51 AM

    Q14:Turbo-core mode is only available on the Power 780 server models. Turbo-core mode allows the server to “switch” from normal operating mode of 8 cores active to 4 cores active. This switch can only occur after an IPL. In Turbo-core mode the 4 cores active achieve higher performance because these active cores can utilize the extra cache made available from the 4 inactive cores.

    ReplyDelete
    Replies
    1. AnonymousJuly 26, 2012 at 3:30 PM

      Indeed the 4 cores actually access the entire 32MB L3 cache, each core 8MB*4 =32MB.
      Also in turbo-core mode the CPU cycle in high frequency making the processing faster.

      Delete
  9. AJAY _ InfraFebruary 28, 2012 at 7:32 PM

    Great Lavanaya...

    ReplyDelete
  10. what is virtualizationMarch 9, 2012 at 10:44 PM

    Currently I work for Dell and I think virtualization, in computing, is the creation of a virtual (rather than actual) version of something, such as a hardware platform, operating system, a storage device or network resources.

    ReplyDelete
  11. Manoj LilaniMay 12, 2012 at 3:30 AM

    Q.12:

    Automatic Storage Management (ASM) on AIX requires a Volume Manager (VxVM) setting when raw volumes are used. This volume setting allows VxVM to access the first 4k of the disk, normally reserved for AIX LVM use. This setting needs to be made before any ASM usage of the volume, changing the setting later can cause corruption during rebalance or other ASM operations.
    To make this change requires setting the correct volume sub-type:
    To change the volume devsubtype:

    # vxvol -g set devsubtype=dsvmprime
    To verify what the devsubtype variable is set to:

    # vxprint -g -m | grep devsubtype

    ReplyDelete
    Replies
    1. AnonymousJuly 26, 2012 at 3:33 PM

      Buds, I feel you need not have to have VxVM (veritas) for ASM, as ASM has its own LVM on the oracle side of the house.
      What you do as a system admin is change the raw disks (/dev/rhdiskX) ownership, and give the disk 'as is' to DB Admin.

      Delete
  12. The RedefinerDecember 21, 2012 at 7:51 AM

    Hi..Dear Friends,
    Greetings for the day...!!!!

    Hope you all unix masters specially IBM AIX - ADMIN'S Provide me possible help as a study material and interview questions on my email id:- krisshran@gmail.com
    Thank you...



    Your loving
    Krisshran

    ReplyDelete
  13. shivaMarch 21, 2013 at 4:30 AM

    Hi all,

    This is shiva,now only i have completed B,sc IT and freshers also.
    I have choose Aix profile but i don't know where can i get AIX,HACMP,HMC,LPAR,DLPAR and VIO server training to become Aix administrator.I mean like training institute. Please If you have idea or decision. please share your valuable information to this mail id aixshiva@gmail.com. I am waiting for your reply.

    Thanks
    s.shiva

    ReplyDelete
  14. RajnikanthApril 22, 2013 at 2:30 AM

    Hi Shiva,In hyderabad kernel technologies provides training on above skill set.It also there in pune..You can search in google for contact details..

    ReplyDelete
  15. UnknownApril 23, 2013 at 11:42 AM

    What is the difference between AIX 4.3, 5.1, 5.2, 5.3 and 6.1?
    # 4.1 : Added online backup function
    5.1 : JFS2 , introduced Logical Partitioning on POWER4 , The L stands for Linux affinity, Trusted Computing Base (TCB)
    5.2 : Dynamic LPAR support, iSCSI Initiator software
    5.3 : Virtual Ethernet, Micro-Partitioning support, JFS2 filesystem shrink support
    6.1 : Workload Partitions, Live Application Mobility

    ReplyDelete
  16. AnonymousMay 14, 2013 at 11:35 PM

    Hai friends,

    thanks for your valuable reply.pls consider & send some interview point of question this mailid:arul8mani@yahoo.com

    ReplyDelete
  17. UnknownAugust 9, 2013 at 12:25 AM

    Can you please share the openings on Aix..to sainath.linux@gmail.com

    ReplyDelete
  18. UnknownMarch 31, 2014 at 10:45 AM

    Q.10) hypervisor allocating the time slices during the demand time based on weaight valuesonly.default weaight value range 0-255 only.so first lpar value is 98 and lpar weaight value is 105 so first we need to cal 98+105=203, 1sth lpar is 98/205=0.4 and 2nd lpar value is 105/203=0.5 so hypervisor first allocating time slices during the peak time which is low value.so its first allocating cpu value to first lpar only

    ReplyDelete
  19. AnonymousJuly 26, 2014 at 4:51 AM

    Hi MADHAV. I heard that more weight gives more priority but...

    ReplyDelete
    Replies
    1. UnknownSeptember 3, 2014 at 7:14 AM

      what i mentioned above that is correct only bcz which is having low weight it gets more cpu in demand time

      Delete
  20. UnknownJuly 26, 2014 at 5:25 AM

    Hi any one can provide me full differences between p4,p5,p6 and p7

    ReplyDelete
  21. UnknownJuly 26, 2014 at 5:26 AM

    Hi MADHAV. I heard that more weight gives more priority but...

    ReplyDelete
  22. AnonymousAugust 27, 2014 at 10:16 PM

    Hi,
    Weight factor is associated with uncapped aix LPAR,it is generally share based mechanism.Higher the value,better chances of LPAR will get excess CPU cycle .

    ReplyDelete
  23. UnknownMarch 26, 2015 at 9:32 PM

    Hi..Dear Friends,
    Greetings for the day...!!!!

    Hope you all unix masters specially IBM AIX - ADMIN'S Provide me possible help as a study material and interview questions on my email id:- surendraadmi@gmail.com
    Thank you...

    ReplyDelete
  24. UnknownFebruary 8, 2016 at 10:04 PM

    hi plz tell me ans for 15th question

    ReplyDelete
  25. UnknownApril 19, 2016 at 12:07 AM

    Hi friends myself Ganesh kumar i would like to know what are the differences between ibm power6 and ibm power7 Hardware models.

    ReplyDelete
  26. K BalaramMarch 5, 2017 at 11:06 PM

    This comment has been removed by the author.

    ReplyDelete
  27. K BalaramMarch 5, 2017 at 11:06 PM

    Hi..Dear Friends,
    Greetings for the day...
    IBM AIX - ADMIN'S Provide me possible help as a study material (aix,hacmp,nim,lpar,dlpar,vio) and interview questions on my email id:- kakarla271@gmail.com
    Thank you...

    ReplyDelete

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