Re: Power HA and Journaling.

[DrFranken <midrange@xxxxxxxxxxxx>]

Just for clarity, if you think you can use Mimix without Journaling you 
would be in error. :-)

Seriously though that is HOW Mimix replicates, by sending the journal 
entries.

Now you may THINK that journaling will use a lot of disk space, and it 
CAN (WHICH I am OK with because I sell disk space!) but with proper 
management it doesn't consume much at all.  Low single digit percentage 
of disk space is normal.

Also for PowerHA you may want to set the attribute to rebuild access 
paths at IPL time.  We have found that while this increases IPL times a 
little (5 minutes maybe on a 2TB system) it REALLY helps reduce the 
instance of damaged objects. Oh and be sure you are journaling your 
access paths as well!

        - Larry "DrFranken" Bolhuis

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

On 1/29/2015 9:53 AM, Rick Mason wrote:

> Hi Midrange Group,
> This comes down again to not being able to find PowerHA for the system I
> classes to get the full grasp of the profuct.
> I found out yesterday that another jurisdiction that has almost the same
> configuration we have, had to switch to their back up Iseries only to find
> when they switched back to the source system they had a large number of
> damaged objects due to the objects not being journaled.   From what I am
> hearing, they assumed like us that in a cluster env. using geo mirroring
> that the need for journals on most objects in the data library were not
> needed like they would be in a environment such as Mimix that replicates on
> the object level.
> So, can someone help me understand this a bit better because now I am being
> told we are going to have to start journaling most objects in our data
> library and this will cause me to lose a lot more disk space.
> Not sure if what I am saying is clear or not....please let me know if you
> need more information to properly address the question.
> Thanks all...................