SAVE/RESTORE ROUTINES FOR EPICS

Leo R. Dalesio, Los Alamos National Laboratory

EPICS COLLABORATION MEETINGNOVEMBER, 1995

LIMITATIONS

• The routines are loaded and executed in vxWorks

• The maximum save rate is limited by the file I/O to about once every 2 seconds

• The files are loaded into memory - using about 2 times the size of the request file

SAVE• Periodic: create_periodic_set (filename,period)

– save every period• Triggered: create_triggered_set

(filename,trigger_channel)– save when trigger channel is non-zero

• On: create_monitor_set (filename)– save when min_period is expired and one channel

has changed• Manual: create_manual_set (filename,period)

– save when manual_save(filename) is called• The trigger channel and monitor sets use the channel

access monitor• To save channels - the channel access GET is used: no

deadbands applied vs. slower

SAVE• There is only one save set per "filename" even if multiple

methods are enabled.

• The data is currently saved to the save file name:

– default is "filename".sav (filename is truncated to the first '.'

– set_savefile_name(filename,"savefile name");

• There are two global variables limiting the frequency of the save:

– min_period = 4.0; Save no more frequent than once every 4 secs

– min_period = 1.0; Check if save is required every 1

• Save incomplete sets is an option:

– sr_save_incomplete_sets_ok = 1;

• fdblist(); will print all enabled save files

File Formats

• File for the enable routines:

• ArcVoltage• ArcCurrent• ArcPower• ArcVoltage.FRED• RF1:setting

• Savefile:• # save/restore

V1.0 .......• ! 2 channel(s) not

connected - ......• ArcVoltage 2.8• ArcCurrent 123.7• ArcPower on 1• ArcVoltage.FRED

Search Issued• RF1:setting No Value

Restoring Saved Files

• Using Channel Access:– fdbrestore(savefile_name)– Works across the network– Must be called after IOC initialization is complete

• Using Database Access:– reboot_restore(savefile_name)– Works only on the local IOC– Can be called in init_hooks before database

initialization• Produces a backup file if the restore is successful:

– savefile_name.bu• Restore incomplete sets is an option:

– sr_restore_incomplete_sets_ok = 1;