Re: [Cs-studio-users] Multiple ArchiveEngines

[zunbeltz <zun...@es...>]

Dear Kay (I answer inline):

ar., 2014.eko iraren 16a 20:07(e)an, Kasemir, Kay igorleak idatzi zuen:
> 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.

Do you take some care on not trying to write at the same time with 
different engines? Or some ohter measure?

> 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.

In our installation we have just 290 PVs (4 of them are 2500 arrays). 
Most of the PV are sotred on change (this means that ACCT noise data is 
stored at the moment). This amounts to ~7 GB of data per day. I can 
image that at SNS you have a much bigger data. What do you cope with that?

> 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.

Thanks for the information.

Best regards,

Zunbeltz

> -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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-- 
Dr. Zunbeltz Izaola
Accelerator Physics Group
ESS-Bilbao