RE: archiving system

[<james.rowland@diamond.ac.uk>]

Hi

I'm afraid I won't be able to attend the EPICS meeting but see the older
messages on tech-talk from the various RDB archiver authors. Ralph makes
a good point that the only widely deployed archiver is the
non-relational Channel Archiver.

James

> -----Original Message-----
> From: tech-talk-bounces@aps.anl.gov 
> [mailto:tech-talk-bounces@aps.anl.gov] On Behalf Of Ralph Lange
> Sent: 28 September 2010 15:41
> To: Dirk Martin
> Cc: EPICS Tech Talk
> Subject: Re: archiving system
> 
> 
>   Dirk,
> 
> James Rowland from Diamond recently did a poll and has the 
> most current list of archiving solutions that are used with 
> EPICS. I think he will talk about it at the upcoming EPICS 
> Collaboration Meeting in two weeks.
> 
> My first order answer would be:
> 
> There's the Channel Archiver: old, stable, fast, very widely 
> used, but not based on a RDB.
> There are several other archiving solutions, some of which 
> use a RDB for storage, others don't. Different ages, 
> different languages, different file formats or RDB systems 
> for storage. Their common feature: they are all used at one 
> lab only, two labs maximum.
> CSS databrowser support is available for the Channel 
> Archiver, and for the Oracle-based archiver at SNS. (The 
> latter might not be part of the DESY CSS.) There is 
> experimental support for HyperArchiver (Channel Archiver 
> writing into Hypertable).
> 
> While RDB-based archiving solutions have a tendency to be 
> slower (as well in writing an archive as retrieving from it), 
> I don't see an issue here for your system (unless your 10K 
> channels are updating every second or faster).
> 
> Hope this helps,
> Ralph
> 
> 
> On 28.09.2010 10:23, Dirk Martin wrote:
> > Hallo,
> >
> > at the S-DANILAC of the TU Darmstadt we're using EPICS to control 
> > power supplies for example. Since it is necessary to observe ~10000 
> > PVs for a period of nearly four weeks, we decided to introduce an 
> > archiving system based upon a relational database. We're using CSS 
> > (from the DESY) and would like to plot the archived data in 
> the Data Browser.
> >
> > That is why I ask you, whether you could tell me, which archiving 
> > system is wide-spreaded enough and best for this job.
> >
> >
> > Thanks in advance and best regards
> >
> > Dirk Martin
> 

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