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.

Note: If you dont have CD to boot up the server in maintenance mode, then you can use the NIM server to get maintenance mode. Please see the link below.

http://howtoaix.blogspot.in/2015/04/how-to-boot-server-into-maintenance.html

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 increase memory using dlpar in aix?

How to change 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.