AIX & HACMP Migration

[sivatek]

Experts:

I am new to HACMP.

We have 2 nodes running with HACMP version 4.3.1 and AIX Version 4.3.

Now we are planning to upgrade OS to 5.2. As AIX 5.2 wont support,
HACMP 4.3.1, we need to upgrade HACMP too.

I am facing difficult task here to plan and execute this.

Can someone let me know

- to what HACMP verion we can upgrade (4.5 or 5.1)?
- What are the upgrade steps involved
- Any precautionary measures
- What are the best options available to do this upgrade?

Finally, how can I know whether I am having HACMP or HACMP/ES?

If you can suggest good documentation on this, it will be great.

Thanks

 

[RMGBELGIUM]

Hi sivatek,

I reccommend checking out the redbooks from IBM, we also migrated from AIX4.3.3 to AIX 5.2, and we had to install HACMP 5.1.
First of all : good planning is required.You will notice that HACMP 5.1 is quite different from version 4.3.Especiallly the prerequisits for some setups have changed a lot ( with cascading resource groups, all adapters must be on a different subnet and so )
The books I can advise are :

Planning and Installation guide
Administration and Troubleshooting guide

These are all downloadable at

http://www.redbooks.ibm.com/

greetz,

R.

 

[fjw999]

I am about to carry out the same migration.

sivatek: is there any gotchas to watch out for?

 

[DSMARWAY]

hi ,

NOTE:- when upgrading AIX 4.3 to 5.2 make sure all your firmware is up to date ( i.e. system firmware, disks , etc.. , you have maintenance level greater than 10 installed , and you've installed the xlc.rte ( • Install APAR IY17981 to upgrade xlC.rte from 5.0.0.0 to the required 5.0.2.x. The server will not boot properly without this upgrade to the C compiler.
make sure all software is committed.

ALSO NOTE when re-applying your cluster snaphot , it may fail so make sure you a have list of your topology , ip addresses , dummy MAC address etcc. just in case you have to configure your cluster manually.


1. Take a mksysb of all nodes.
2. Stop hacmp on all nodes.
3. Take a cluster snapshot
this will be created in /usr/sbin/cluster/snapshots
4. Copy the created .info and .odm files to a somewhere safe e.g. /tmp or on another machine
5. de-install HACMP 4.3.1
6. Update AIX on both nodes to AIX 5.2 (migration install)
7. Install HACMP 5.1. + latest fixes & reboot
8. On one node copy the snapshot files back to
/usr/es/sbin/cluster/snapshots
9. convert the 4.3.1 snapshot to 510:
Usage: /usr/es/sbin/cluster/conversion/clconvert_snapshot
[-C|-N|-E] -v [release] [-s [snapshot_file]]

-v version of snapshot
-s source snapshot (must be in the snapshots directory) without the
.odm -C flag means converts to ES

e.g 4.3.1 for /usr/es/sbin/cluster/conversion/clconvert_snapshot -v 4.3.1 -s 431snapshot


for 431 Classic: same as above but add the -C flag to convert to ES

10. Apply the converted snapshot on one node.
11. sync topology and resources.
12. start HACMP on the nodes.

good luck

HTH