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<== Date ==> <== Thread ==>
Subject: Re: PV save and restore tool sought
From: Thomas Birke <[email protected]>
To: [email protected]
Date: Fri, 29 Jun 2007 16:55:27 +0200
Judith E. Rock wrote: 
Dear EPICS folk,
The LCLS project at SLAC is seeking a good save and restore tool (something along the lines of BURT or SCORE) to manage saving and restoring specified PVs on demand.
Does anyone have any recommendations or experiences to share with us?  We appreciate your input.
At BESSY, we use two of the already mentioned ways to save and restore specific PVs on demand.

The warm-reboot save-and-restore is realized with the IOC-based version of autosave as it comes with the synApps package.

Everything else is done with a powerful Tcl/Tk-frontend to "burt" and some sdds-tools (the latest version doesn't even use "burt" anymore).
It is an often-used program to save and restore specific settings of parts of or the whole machine (called snapshots) together with some meta-information

   * time and date of the snapshot
   * a comment provided by the user
   * the list of areas saved in this snapshot
   * some additional tags (Multi- or Single-Bunch, Energy...)

The program is based on a script we got from JLab (when it still was CEBAF) written by Bruce Dunham back in '95, but it was basically rewritten at least once over the last 10 years
It also provides additional features like

   * comparing stored snapshots in different ways
         o compare the contents of two snapshots
         o compare settings and readbacks within one snapshot
         o compare a snapshot with the current values read from the machine
   * filter list of stored snapshots by comment/tags/date
   * view the contents of a snapshot
         o if requested, filter signals by pattern
   * restore parts of or a whole snapshot
         o if necessary perform special operations before or after
           restoring
               + e.g. disable/enable some processing or request
               + request explicit confirmation before overwriting
                 certain values

The only thing, that's left from the CEBAF version is the fact, that it is still Tcl/Tk.

I also like the idea of having an archiver save a set of values on trigger (it's not even that new - wasn't there something called save-set-archiver several years ago?).
But I never had the time to work on this, and people here at BESSY actually got used to our SaveRestore.tcl.

Thomas Birke

BESSY GmbH
Albert-Einstein-Str. 15, D-12489 BERLIN
BESSY GmbH - Mitglied der Leibniz Gemeinschaft
Vorsitzender des Aufsichtsrates: Prof. Dr. Dr. h.c. mult Joachim Treusch
Geschäftsführer: Prof. Dr. Dr. h.c. Wolfgang Eberhardt, Prof. Dr.
Eberhard Jaeschke Sitz Berlin, AG Charlottenburg, HRB 14635

Replies:
Re: PV save and restore tool sought Emmanuel Mayssat
References:
PV save and restore tool sought Rock, Judith E.
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