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reinstall HMC...

Posted on 2014-01-21
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OK, we have a HMC V7R7.3.0 managing two power servers. The question is, If I reinstall HMC (from Recovery DVDs) without backup data before the upgrade, can it manage again the two servers? Or it mandatory to have HMC's backup?
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Question by:sminfo
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by:woolmilkporc
woolmilkporc earned 500 total points
ID: 39796896
Hi,

let's say it's much better having a backup ...

... although the HMC can discover the configuration of the managed systems, because it's stored in the machines' NVRAM.

If your environment isn't set up with the HMC as a DHCP server then you should know the IP addresses of your managed systems or at least their subnet, so you can tell the HMC where to look for machines. The HMC can scan a full network, but this will take days!

And you will definitely loose all your self-configured userids, along with their SSH keys, if any! Without a "Vital Data" backup they cannot be recovered (besides from your memory or - possibly - docs).

By the way - I know where I'm speaking of (bitter experience, first hand).

wmp
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by:sminfo
ID: 39796912
jee... OK, I suppose the vital backup is from:

HMC - management / Back up management console data ---> to a ftp/NFS/USB

So, once I have reinstall HMC I restore it from:

HMC - management / Restore Management Console Data <----  to a ftp/NFS/USB

Is that? If so, l schedule a daily backup to FTP on our NIM.

Also, wmp maybe you can help me, If I want to add a new HMC to the existing, it MUST have the same version? what happend if I connect a second HMC to the free HMC-port on the server with a different version?
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by:sminfo
ID: 39796979
Also... and really sorry if I'm asking again...;)

If I have the daily vital backup of my HMC remotely.. and HMC is gone forever...can it be restored on a different HMC with a lower or higher version?

Thanks..
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by:woolmilkporc
woolmilkporc earned 500 total points
ID: 39796996
Yes, all correct.

I, personally run (now) an FTP job weekly, triggered by the HMC's internal scheduler, to ... our NIM server.

As for the second HMC: The HMC code levels must match!

The installation/configuration should be quite straightforward, as with a single HMC.

Just take care to perform the basic (network) configuration first before attaching the new HMC to the managed servers.

I don't know what will happen if HMC levels differ (I never tried it, as opposed to the reinstallation from scratch without a backup, see above).
All I know is that IBM say that the levels must match.
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woolmilkporc earned 500 total points
ID: 39797011
To the new question:

You cannot restore HMC backups when the backup version and the version running on the target HMC differ. Believe me - it simply doesn't work!

I had to try that, too, because I once performed two upgrades on a single day, with the backup being taken just once before starting.
I noticed too late that the second version was not supported by our hardware. I had to go back - but to yesterday's version, not to the successfully installed first upgrade version because my backup was too old.
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by:sminfo
ID: 39797038
Very interesting...;)

So, if HMC is gone forever and I have a lower HMC version, I connected it, I need to discover again ths IPs from FSP and I'll be able to access LPARs, vios, etc but all other configuration will be lost.. Is that way?

Thanks once more.
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by:woolmilkporc
ID: 39797119
Sounds (nearly) good.

You need to make the HMC discover the configuration of the FSPs by using their hopefully known IP addresses. "Discover the IPs ..." makes no sense, unless you're going to let the HMC scan the whole network.

This way you'll get back the configuration of your managed systems, but everything you did on the HMC (mostly users, keys, cronjobs) will be lost.

Thx for the points once more!

wmp
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