AIX Migration From 5.3 to 6.1 TL6 SP05

                         

Pre Migration Checks

-------------------------- --                                                                   30 to 40 min

1. Check the consistency of installed Licensed Program Products (LPPs)

    #lppchk -v -m3

    This will ideally display the inconsistencies (if any) of the LPPs.

     # instfix -i|grep -i ml

        

2. Check previous day night incremental backup is completed successfully.

   if the scheduled backup still going on, wait for backup to complete.

   If the scheduled backup is not successful, run the backup manually                                                   

    more /tsmlog/dsmsched.log | grep -i successfully

    

3. Take the mksysb backup and copy the mksysb  to tusnim00 server

4. Capture all the below outputs into user home (/home/rchandra)directory and scp to tusnim00 server also.

df -g > df.orig

lspv > lspv.orig

cat /etc/filesystems > filesystems.orig

lscfg > lscfg.orig

lsconf> lsconf.orig

ps -ef > ps.orig

netstat -nr > netstat.orig

ifconfig -a > ifconfig.orig

lsfs > lsfs.orig

lsdev -Cc disk > diskconfig.orig

cp /etc/motd /home/rchandra/

cp /usr/sbin/sendmail  /home/rchandra/

cp /etc/inetd.conf /home/rchandra/

cp /etc/environment /home/rchandra/

5. Check the compatibility of firmware with the upgrade version ( AIX 6.1)

6. /tmp filesystem will be clear during migration. Check /tmp before initiate migration. Take the backup of  files and directories to some other filesystem or server if require.

7 . Check the status  of  all harddisks (local,virtual and SAN) status configured in server.

8. Make sure that all application/data VG  filesystems backing up to TSM server.

Clone the rootvg using alt_disk method 

--------------------------------------------------

Note: We are using only phase1 and phase3 of IBM alt_disk_install method

1. Disable the quorum before unmirroring                                       20 Min

     chvg -Qn rootvg

     Unmirrorvg rootvg hdiskx

    lsvg -l rootvg

    Check filesystems, which are not mirrored.

Also compare the output of "lspv -l hdisk0" and "lspv -l hdisk1" and try to find out the unmirror filesystems.

 Then migrate the filesystem as per your requirement. E.g. if you want to unmirror hdisk1, migrate all unmirrored filesystems to hdisk0 from hdisk1.

   e.g. #migratepv -l pdumplv hdisk1 hdisk0

   #unmirrorvg rootvg hdisk1

   #chpv -c hdisk1

   #reducevg rootvg hdisk1

   #bootlist -m normal hdisk0

   #chvg -Qn rootvg

   #synclvodm -Pv rootvg

2. Clone rootvg                                                                     40 to 50 Min

   #mkdir /tmp/Migration

   #chmod 777 /tmp/Migration

   #alt_disk_install -C -P 1 hdisk5 > /tmp/Migration/rootvg_clone.log_1 2>&1

   #tail -f /tmp/Migration/rootvg_clone.log_1

Note ; hdisk1 should be the empty disk and not assigned to any volumegroup(generally we will use the disk which we free up by unmirroring rootvg)

   It will create an additional VG called altinst_rootvg and filesyems named liked /alt_usr, /alt_home etc.

3. Complete update process:                                                 10 Min

   #alt_disk_install -C -P 3 hdisk5 > /tmp/Migration/altinst_P3.log 2>&1

   It will unmount all the /alt_usr, /alt_home etc. filesystems and then varyoff the altinst_rootvg

NIM server side preparation

-------------------------------------                                            15 Min

1 . Prepare the NIM resources as below

Define the client ( ex : tusfidb07)

Prepare the respective lppsource using BOS filesets (AIX 6.1)

Make a spot using LPPSOURCE

Bind the resources lppsource  and spot with the client machine( nim_bosinst)

Below are NIM resources which we are using currently in tusnim00

LPPSSOURCE - AIX61TL06SP05_lppsource

SPOT - AIX61TL06SP05_spot

Note: Here we should use rte option while binding client with the NIM resources (lppsource and spot).

NIM Client side Preparation

-------------------------------------                                         

Note : Perform a precautionary reboot before starting any migration steps.

1 . Shut down the server once we get the confirmation call from Application team.  10 Min

2 . Boot the client node in SMS menu and start the migration activity.     10 Min

Set the IP parameters properly

NIM server IP :

Client IP :

Gateway:

Subnet mask:

Perform ping test to NIM server ( If fails stop the activity and check the network connectivity between NIM server and client)

Select network as boot device.

3 . Change the installation option as Migration after language selection.   120 Mins    

Check the destination disk where migration going to happen (That should be your currnent running rootvg disk generally hdisk0).

Observe and give few inputs till  the fileset installation started .Once Migration completed server will automatically reboot with new version of OS

Post Migration Tasks

----------------------------

Check the oslevel and consistency of the filesets using below command

#lppchk –v –m3

1)      Upgrade the TL to latest level AIX 6.1 TL7 SP2 using  smit update_all      60 Mins

   Filesets available  in  tadmin server under  /aix_sw/AIX61TL7SP2.

Run bosboot and set your bootlist order to correct harddisk before you initiate reboot.

#bosboot –ad /dev/diskname ( disk should be part of rootvg)

#bootlist –m normal hdiskx hdisky

2)      Check sshd daemon is running after migration, If not do the uninstall and  reinstall of openssh and openssl filesets.

Recreate the ssh keys after installing ssh.                                                    15 Min

3)      Modify the /etc/motd file after migration with server and data centre

4)      Check /etc/environment and modify if required (ex: LANG parameter LANG=en_US)