Re: HMC as a Power lpar?

- Larry "DrFranken" Bolhuis

www.Frankeni.com
www.iDevCloud.com - Personal Development IBM i timeshare service.
www.iInTheCloud.com - Commercial IBM i Cloud Hosting.

On 8/9/2017 1:37 PM, Rob Berendt wrote:

I see your DR situation is mainly hypothetical. Although I suspect you
have had a hand in a few real ones.

Yes and problem is 'what was the disaster'. Was it fire/flood/etc that damaged or destroyed everything or just an even that rendered the DC unavailable for a time. One is a lengthy rebuild while the other is just getting everything running and communicating again. Could still be 'lengthy' but not relative to the first.

In this theoretical DR situation one thing to consider is this:
- Time to get a new physical HMC and spin it up. That finding and
shipping time may be significant.
- Time to recover the virtual one.

Getting a replacement HMC is no faster or slower than getting a replacement Power System so no problem there really if you have to rebuilt the entire DC anyway.

The Virtual one is just a row of bits so you can put it on your virtulization platform once that's running.

I've never done a bare metal restore of HMC. I suspect everyone rather
starts over in such a situation. With a virtual one a bare metal restore
would be possible.

Load new, add configs is 99% of what I've seen and done. With a vHMC you could certainly restore an image if you have one and that's faster than a pHMC reload for sure.

Probably a lot more economical to have redundant virtual HMC's, from
different virtual servers.

Agreed, and we do that a lot.

- L

Rob Berendt