HACMP upgrade from 4.5 to 5.1

[ranjit]

I will shortly be required to upgrade a HACMP cluster (4.5) to HACMP 5.1. I understand HACMP 5.1 is a very different product. What is the best approach:

1) To migrate from 4.5 to 5.1 via smitty update_all or,

2) Remove the existing 4.5 install (having taken a cluster snapshot) and then re-install from the 5.1 CD's.

Have there been any major problems encountered in moving from 4.5 to 5.1?

Tank you.

 

[LeDam]

Personally, i would start with the deinstallation of HACMP 4.5.

Pay attention, the new typical configuration in HA 5.1 is now IP takeover via IP-aliasing and not IP takeover via IP-replacement...

 

[ranjit]

What is the difference between ip-aliasing and ip-replacement?

 

[LeDam]

Ip-aliasing : your service IP address is an alias on your interface. You will have 2 IP for the same interface (en0 for example).

Ip-replacement : you switch service IP address with the boot address and in case of failover, with the stand_by addess on the other node.

In HA 5.1, you have also a "persistent IP" using for administration. This IP is associeted to the hostname and is up at boot time (you haven't to start HACMP to get it).

I can send you a schema explain this... it's better... if you want:
d_vancutsemAhotmail.com

 

[made13]

I am also in the middle of setting up a cluster using hacmp 5.1 on aix 5.1. I want to use ip aliasing for my setup. However, it seems that you cannot have a the SERVICE IP on the same subnet as the BOOT IP. I've tried this for both cascading and rotating clusters. How do I get around this problem. Previous versions allowed you to alias the service address to the boot address on the same subnet.

Also, I cannot seem to find where to set the adapter attributes. cllsif at the moment shows all my adapters are type 'boot'. How/where do I specify the adapter type?

Any help will be appreciated....Thanks.