Re: [Cs-studio-users] Multiple ArchiveEngines

[Kasemir, K. <kas...@or...>]

Hi:

We run about 40 archive engines. One for channels related to vacuum, one for water, one for low-level RF, …
All write to the same RDB, so that's not a problem.

There is no short-term/middle-term/long-term, though. All go to the same RDB tables.

In principle, the channel configuration contains a "retention" parameter.
You could configure that to for example set the retention of some channels to "1 year", and then you can write a tool that deletes data for those channels that's older than one year.
For now, nobody has written such a tool.

The SLAC Archive appliance has the idea of short-term/middle-term/long-term, you'll have to look for info on that, it's a different system.
As an end user, you can view data from that with the same CSS data browser, but the archive config/engine/storage/maintenance is different.

-Kay


On Sep 16, 2014, at 6:08 AM, zunbeltz <zun...@es...>
 wrote:

> Dear all,
> 
> As I understand from the CSS documentation; it is possible to have 
> multiple ArchiveEngine programs running (even in the same computer) 
> different archive prupouses (like short-term, middle-term and long-term 
> archiving).  Am I right?
> 
> My question is: Is it possible to write to the same DB from different 
> ArchiveEngine? Is it dangerous or not a good idea?
> My intention is the following. I want to setup a DB for long term 
> archiving for the machine physics group. The idea is to store parameters 
> with a low frequency, but I also need some how to store more parameter 
> when we are running, say a Wire Scanner experiment. For this I was 
> thinking to just run another ArchiveEngine that writes to the long term 
> DB. Sounds it right?
> 
> Thanks in advance,
> 
> Zunbeltz
> 
> -- 
> Dr. Zunbeltz Izaola
> Accelerator Physics Group
> ESS-Bilbao
> 
> 
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