Re: Another PowerHA Question

[Jim Oberholtzer <midrangel@xxxxxxxxxxxxxxxxx>]

The tracking data is really only a list of 4K page addresses that have 
to be sent to the target.  It is a finite amount of space that has 
sufficient room to hold all the addresses.  So when you create the 
tracking space you do it once, and it's there.  It won't grow unless you 
add storage to the system.  Then it will grow enough to hold those 
addresses as well.

Since the system will only send the most recent memory pages, it does 
not need to keep the sequential  data the way an application replication 
product does.

Jim Oberholtzer
Chief Technical Architect
Agile Technology Architects


On 5/22/2013 11:20 AM, Kirk Goins wrote:
> With logical replication, when the link or target is down, you can watch
> your disk space shrink and see the journals pile up.If need be you can save
> and then delete journal receivers to prevent running out of disk until you
> can get the link backup.
>
> Now With PowerHA if replication is suspended with tracking, Can I manage
> this tracking data in a similar way? What is really being tracked? I assume
> it is more than just list of changed disk blocks.
>
> Thanks
>
> -- Kirk
> --