How to reset the unknown root password in aix?

How to reset the unknown root password in aix?

1. Ground work:

Get the hmc details

Get the hscroot password of the HMC

Make sure CD available on the server.

Login to hmc and reboot the server from sms mode

2. Implementation

(Boot the server in sms mode and follow the below steps)

5. Select boot options

1. Select install/Boot device

4. IDE

1. IDE-CDROM

3. Service mode boot

1 Yes (Exit sms)

1. Type 1 and press enter to have english during install

3. Start maintenance mode for system recovery

1. Access a root volume group

0 Continue

1 (Select the boot device)

1. Access this volume group and start a shell

# passwd

Changing password for "root"

root's New password:

Enter the new password again:

sync;sync;sync;reboot

                     

3. Validation

login to the server with the new password and confirm you can logon successfully.

4. Downtime

Yes downtime required for this task.

How to reboot HMC server in AIX?

How to reboot HMC server in AIX?

1. Ground work:

Ip address or hostname of the HMC

hscroot password to access the HMC

Get the Frames and Lpars attached to this hmc

cat /proc/uptime                   --> To check the uptime of the hmc

2. Reboot the HMC using command line

Login to the hmc with hscroot access

hmcshutdown -t now -r              --> To reboot the HMC

3. Reboot the HMC using GUI mode

Login to the HMC GUI using hscroot user account

HMC management --> Shutdown or restart  --> select Restart HMC  --> Click OK

4. Post check

cat /proc/uptime                   --> To check the uptime of the hmc

Check you can see all the Frames and its Lpars.

How to stop and start the hacmp cluster in aix?

How to stop and start the hacmp cluster in aix?

1. Ground work:

/usr/es/sbin/clu*/utiI/clRGinfo      --> To check the RG online status

lssrc -ls clstrmgrES                          --> To check the cluster manager is stable on both nodes

cat /var/hacmp/clverify/clverify.log  --> To check and confirm the log file has no errors.

Take a snapshot of the cluster

smitty hacmp

            extended configuration

                        snapshot configuration

                                    Create snapshot of the cluster configuration

                                                cluster snapshot name / Cluster snapshot description

The above will create .odm and .info file.

Take all the basic outputs

2. Stop the cluster services

smitty hacmp

            system management (C-Spoc)

                        Stop cluster services

                                    (Provide necessary details) stop now / provide node names/  Bring RG offline.

3. Validation

./clRGinfo                                 --> To check the RG online status

lssrc -ls clstrmgrES                   --> To check the cluster manager is stable on both nodes

4. Start cluster services

smitty hacmp

            system management (C-Spoc)

                        Start cluster services

                                    (Provide necessary details) start now / provide node names/  Choose Automatic for manage RG

5. Validation

/clRGinfo      --> To check the RG online status

lssrc -ls clstrmgrES                   --> To check the cluster manager is stable on both nodes

cat /tmp/hacmp.out                --> To check the HA services and RG status.

How to change memory using dlpar in aix?

How to increase memory using dlpar in aix?

1. Ground work:

uname -L                                 --> To find the Lpar name and Lpar id.

lparstat -i                                --> To check current assigned memory (Desired memory)

prtconf -m                               --> To check the size of the memory

lsrsrc ibm.managementserver     --> To find the hmc details where the lpar belongs to.

Get the hscroot password to access the HMC for the DLPAR operation.

2. Implementation steps 

Login to the HMC using hscroot access

system management

            servers

                        select the frame

                                    Select the lpar

                                                Dynamic Logical Partitioning

                                                            Processor

                                                                        Add or remove

                                                                                    change the assigned memory

(change the size of the memory - increase upto Maximum memory limits or decrease upto Minimum memory level)

                                                                                                Click OK

We need to change the same in the partition profile so that when the LPAR is reactivated, it should start with the new value.

Select the Lpar

            Configuration

                        Manage profile

                                    Select the default profile last activated

                                                Action

                                                            Edit

                                                                        Now change the desired memory value 

                                                                                    Click OK

                                   

4. Validation

lparstat -i                                        --> To check the output of the memory. (Check online memory)

prtconf -m                                       --> To check the size of the memory.

HMC

HMC

Hardware Management console for managing I AIX and VIO server.

Basically HMC is use for managing AIX LPAR on P series system.
here P series system are POWER5,POWER6,POWER7and POWER8.

Task which we can do  using HMC

1.Create AIX ,Linux and VIO LPAR
2.Create Virtual adapter like SCSI and fibre channel .
3.Dynamic memory and CPU allocation to AIX LPAR.
4.Admin console for Virtual server.
5.Can do firmware update from HMC for P series server.
6.Boot virtual server server into SMS mode
7.Shutdown and reboot of Virtual Server.
8.Also in new version of HMC admin can do virtual server performance monitoring directly from HMC.

Create filesystem in AIX using INLINE and JFS2 log

How To create filesystem in AIX using INLINE and JFS2 log

Method 1: INLINE Log

Identify Volume group on which we going to create Logical volume "testlv".

Make sure that volume group having enough physical partition free to create logical volume(LV).

Here Volume group is datavg

 

mklv -y testlv -t jfs2 datavg

crfs -v jfs2 -d testlv -m /test -a logname=INLINE -A yes

mount /test

Method 2:

Using JFS2 log

mklv -y testlv1 -t jfs2 datavg

mklv -y testloglv -t jfs2log -a e -r n datavg 1

mount /test1

Difference between JFS2 log and INLINE

• JFS2 log support many Filesystems.
• every Filesystem have 1 INLINE log
• if we have several busy Filesystem and we having JFS2log which support these FS,then there is chances of performance bottleneck, to avoid this INLINE log is good option where every filesystem can have 1 inline.

QUORUM in aix

what is quorom in aix ?


During my AIX learning day i always wondered about what is quorom and how it affect volume group on AIX ? But after doing google i found answer like below.

Here is the answer :

Number of disk must be present in volume group to successfully vary on volume group in AIX.

"51% is mandatory vgda."


for example, XYZ volume group having 6 disk so mandatory disk for 51% VGDA is 4.

if disk in volume group is 10 then mandatory disk for 51% VGDA is 6.

Its simple


51% VGDA=Number of disk in Volume group/2 +1


so what happen if that mandatory percentage (51%) not available ?

rootvg quorom always kept disabled.

QUORUM:         1 (Disabled)

Reason behind this is when AIX OS boot and at the time of boot if rootvg having 2 disk and 1 disk from rootvg crashed then OS will never came up,because it not satisfies 51% VGDA rule.so its always good idea to keep mirrored rootvg quorom disabled.



will update new idea and thought on AIX

Thanks !!