Re: PowerHA for i questions

[DrFranken <midrange@xxxxxxxxxxxx>]

If you are going to replicate entire guest partitions which live in an 
iASP of the Host that's clearly doable but DO realize:
1) The target system will be totally shut down during replication.
2) If you 'crash' the source system (i.e. power outage, flood, etc.) the 
target system will experience a very Abnormal IPL. Journaling is 
MANDATORY in that environment.
3) If you want to use the backup system for backups for example you'll 
need to understand that environment and use the quiesce functions etc 
correctly or the backup will trip over damaged objects.
4) You will use more bandwidth than just replicating the iASP with data 
and programs because now EVERYTHING that guest does, including printing 
and any swapping etc all gets replicated.

        - Larry "DrFranken" Bolhuis

www.frankeni.com
www.iDevCloud.com
www.iInTheCloud.com

On 5/7/2015 3:47 PM, Evan Harris wrote:

> Hi
>
> Thanks for the replies so far
>
> Patrick:
> To use the same IP address I guess they would need to be in the same
> network - correct ?
> Also, I have not seen any details on how to tag the IP other than
> references to AIX. Do you have a reference ?
>
> Jim:
> By create target iASP do you mean populate it with data as opposed to
> creating the disk pool
> I think STRASPSSN is the start replication command - is that the command
> you are referring to ?
> When you say not enough CPU allocated to PowerHA - do you mean the source
> or tarket LPAR, or both
> How much CPU (in your estimation) does PowerHA typicall add (I realize this
> is probably an "it depends" type question)
>
> The scenario we are looking at is replicating a couple of guest LPARs from
> one site to another, in different networks. No VIOS, just i on i hosting.
>
> That is good feedback about the network saturation. We are wanting to run a
> test first to gain some understanding of the numbers involved and get a
> feel for how it works.
>
> Thanks again, this is most helpful.
>
> > --
>
> Regards
> Evan Harris