Order of updating DB2, CMOD and Linux

[rmazurki]

Hi,

Currently we have:
Linux Redhat v6.10, CMOD v9.5, DB2 v10.5

We want tu upgrade CMOD to v10 and DB2 to v11.

After looking in CMOD requirements I can see that CMOD v10 requires Linux v7.
So, we have to upgrade Linux first and then upgrade CMOD, right?

With DB2 it seems that there is no dependency from Linux ver or CMOD ver.
So, we can upgrade it whenever we want, right?

Regards
Rafal

[Justin Derrick]

For IBM CMOD Upgrades, if you're going to take an outage, you do everything that needs to be done at once.  If you have different teams, you have the OS upgraded first, then the DBAs and CMOD Admins can work in parallel after the system comes back up.

-JD.

[jsquizz]

For IBM CMOD Upgrades, if you're going to take an outage, you do everything that needs to be done at once.  If you have different teams, you have the OS upgraded first, then the DBAs and CMOD Admins can work in parallel after the system comes back up.

-JD.

I've done this two different ways.

Process One

1) We did AIX/DB2/CMOD on different weekends, this took a while because we had numerous tiers, but it was a very large system, for from what i understand was one of the "top 20" largest customers of CMOD.

One weekend- AIX

Test for a month, verify stability

One weekend - DB2

Test for a month, verify stability

One weekend - CMOD (Backup site)

Test for a month, point all users to this backup site

One weekend - CMOD (Primary site) ONCE EVERYTHING WAS VERIFIED

Process Two

Over a Weekend.

1) SA's did AIX upgrade / patches , quick verification. DBA's hopped in, upgraded/patched DB2, quick verification, Then they gave us CMOD...then we did some loads/testing. And that was really it. It was a very very small system.. < 1TB of cache. From my knowledge, system is still stable.

[rmazurki]

I have received an information from our Unix guys that there is no option to upgrade Linux from RHEL6 to RHEL 7.
It must be a reinstallation.

So, in this situation probably we will order new servers and we have to move all software and data to new servers.
So, now i need information how to do this safe, fast and efficient

I searched our forum and find this:
http://www.odusergroup.org/forums/index.php?topic=609.0

Are on our forum other topics which I should read?

Regarding our setup - for storing we use Cache and TSM.
Document is loaded to cache and TSM at the same time, in Cache it stays for 30 days.
So, It means that we can do migration without migration of cache, because everything we have in TSM.