AIX Questions And Answers

61⟩ What is nmon tool do?

The nmon tool is designed for AIX and Linux performance specialists to use for monitoring and analyzing performance data, including:

✫ CPU utilization

✫ Memory use

✫ Kernel statistics and run queue information

✫ Disks I/O rates, transfers, and read/write ratios

✫ Free space on file systems

✫ Disk adapters

✫ Network I/O rates, transfers, and read/write ratios

✫ Paging space and paging rates

✫ CPU and AIX specification

✫ Top processors

✫ IBM HTTP Web cache

✫ User-defined disk groups

✫ Machine details and resources

✫ Asynchronous I/O - AIX only

✫ Workload Manager (WLM) - AIX only

✫ IBM TotalStorage® Enterprise Storage Server® (ESS) disks - AIX only

✫ Network File System (NFS)

✫ Dynamic LPAR (DLPAR) changes - only pSeries p5 and OpenPower for either AIX or Linux

Also included is a new tool to generate graphs from the nmon output and create .gif files that can be displayed on a Web site.

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62⟩ Explain a little about Vital Product Data?

VPD in AIX and Linux is a collection of configuration and informational data associated with a particular set of hardware or software. VPD refers to a subset of database tables in the Object Data Manager (ODM), Therefore the VPD and ODM terms are sometimes referred to interchangeably.

Vital product data (VPD) stores information such as part numbers, serial numbers, and engineering change levels from the Customized VPD object class or platform specific areas, not all devices contain VPD data.

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63⟩ What is logical volume manager(LVM) means?

The set of operating system commands, library subroutines and other tools that allow you to establish and control logical volume storage is called the Logical Volume Manager (LVM).

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64⟩ Explain hardware management console?

The HMC is a server or stand alone machine that provides a graphical user interface tool to manage several Power Systems. The HMC manages system through hypervisor and operating system. From version 7 it is truly web based and you can configure, installs and manage, partitioned, virtualization most of your Power5 and 6 boxes via HMC. There are many tasks you can do with HMC, such as:

☛Powering off and on of the partition

☛Configure and activate resources to the system

☛Creates and stores LPAR profiles and allocated resources to them.

☛HMC do the dynamic memory reconfiguration of the partition.

☛Setup VIO server and VIO client thru HMC and do micro-partition, create storage

☛pool and processor pool with it

☛Provide virtual console to the partition

Most of the time we installed dual HMC for redundancy and make sure to achieve more uptime in a wide system

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65⟩ What is software RAID Levels do?

Redundant Arrays of Independent Disks (RAID) is formally defined as a method to store data on any type of disk medium.

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66⟩ What is RMC?

The Resource Monitoring and Control (RMC) subsystem is the scalable backbone of RSCT that provides a generalized framework for managing resources within a single system or a cluster. Its generalized framework is used by cluster management tools to monitor, query, modify, and control cluster resources. RMC provides a single monitoring and management infrastructure for both RSCT peer domains and management domains. RMC can also be used on a single machine, enabling you to monitor and manage the resources of that machine. However, when a group of machines, each running RMC, are clustered together, the RMC framework allows a process on any node to perform an operation on one or moreresources on any other node in the domain.

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67⟩ How do you you get rid of a disk that is no longer really in the VG?

In this case, you DON'T want to do an exportvg. What you want to do is tell the system you want to cut out the memory of the old, bad disk from the RS/6000 AND from the VGDA of the volume group. You simply do: reducevg -d -f

or if the hdname can't be found:

reducevg -d -f

Be careful with this command. Unlike the exportvg command, actions done

with this command WILL affect the VGDA information on the platter.

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68⟩ How will you check whether a device is installed or not?

# lsdev -Cc disk

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69⟩ How will you create a file if a disk is given to you?

☛ #mkvg -y datavg -s 128 hdisk1 (pv name)

☛ #mklv -y datalv -t jfs2 datavg 1

☛ #crfs -v jfs2 -d datalv -g datavg -a size=10M -m /fs1

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70⟩ What is JFS?

★ JFS is normal filesystem. We cannot create large files in JFS.

★ Files can be access dynamically.

★ Max file system size=1TB

★ Max file size=64GB

★ Inode size=128b

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71⟩ How do I display routing table, interface and protocol information?

To display routing table information for an Internet interface, type netstat -r -f inet. To display interface information for an Internet interface, type netstat -i -f inet. To display statistics for each protocol, type netstat -s -f inet.

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72⟩ What is JFS2?

★ Can create a large size filesystems.

★ Files can be access accordingly as required. (not randomly or sequentially)

★ Max files system size=4PB

★ Max file size=4PB

★ Inode size=512

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73⟩ How will you find the inode number?

# ls -li

# istat /etc/passwd

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74⟩ How will you change LTG size?

#rmdev -l hdiskx

#chdev -l hdiskx -a max_transfer=0*80000

#mkdev -l hdiskx

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75⟩ How will you find LTG size?

#lsvg vgname

#lquerypv -M hdiskname

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76⟩ How to copy a LV from one VG to another?

# cplv -v <new vg name> <sourcelvname>

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77⟩ How will you find whether a quorum is up or not?

# lsvg vg name

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78⟩ How will you unmirror a VG if a PV gets failed?

First check the blv record using,

# bootlist -m normal -o

Remove the old blv record, using

# chpv -c hdisk2

# bootlist -m normal hdisk1

# bootlist -m normal hdisk2

Now unmirrorvg

# unmirrorvg rootvg hdisk2

# reducevg rootvg hdisk2

#lsvg -p rootvg

# lspv

# bootlist -m normal -o

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79⟩ What is mirroring concept?

Check disk size belong to vg , take two same size disk to mirror

# bootinfo -s hdisk2

#lsvg -p rootvg

Add one more disk of same size of already have disk having rootvg.

# extendvg rootvg hdisk2

# lsvg -p rootvg

Now mirror vg with background sync LV. It sync LVs in background with new LVs

# mirrorvg -s rootvg

Create a boot image

# bosboot -ad /dev/hdisk2

#bosboot -ad /dev/hdisk1

Add a blv

record of newly added disk, first check and then add.

# bootlist -m normal -o

#bootlist -m normal hdisk2 hdisk1

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80⟩ What is T - Factor?

T - factor means that it will change the pp size to increase the efficiency of vg

#chvg -t16 datavg

Cal-if suppose that datavg pp size is 1016 we can take t factor is 16 then it comes to 2048 and pv contains in vg is 2.

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AIX

Home IBM Tools AIX

116 AIX Questions And Answers

61⟩ What is nmon tool do?

62⟩ Explain a little about Vital Product Data?

63⟩ What is logical volume manager(LVM) means?

64⟩ Explain hardware management console?

65⟩ What is software RAID Levels do?

66⟩ What is RMC?

67⟩ How do you you get rid of a disk that is no longer really in the VG?

68⟩ How will you check whether a device is installed or not?

69⟩ How will you create a file if a disk is given to you?

70⟩ What is JFS?

71⟩ How do I display routing table, interface and protocol information?

72⟩ What is JFS2?

73⟩ How will you find the inode number?

74⟩ How will you change LTG size?

75⟩ How will you find LTG size?

76⟩ How to copy a LV from one VG to another?

77⟩ How will you find whether a quorum is up or not?

78⟩ How will you unmirror a VG if a PV gets failed?

79⟩ What is mirroring concept?

80⟩ What is T - Factor?

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AIX

Home IBM Tools AIX

116 AIX Questions And Answers

61⟩ What is nmon tool do?

62⟩ Explain a little about Vital Product Data?

63⟩ What is logical volume manager(LVM) means?

64⟩ Explain hardware management console?

65⟩ What is software RAID Levels do?

66⟩ What is RMC?

67⟩ How do you you get rid of a disk that is no longer really in the VG?

68⟩ How will you check whether a device is installed or not?

69⟩ How will you create a file if a disk is given to you?

70⟩ What is JFS?

71⟩ How do I display routing table, interface and protocol information?

72⟩ What is JFS2?

73⟩ How will you find the inode number?

74⟩ How will you change LTG size?

75⟩ How will you find LTG size?

76⟩ How to copy a LV from one VG to another?

77⟩ How will you find whether a quorum is up or not?

78⟩ How will you unmirror a VG if a PV gets failed?

79⟩ What is mirroring concept?

80⟩ What is T - Factor?

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