I don't know about the 8 file limitation. Tim Mooney may know about that.
pass0 is like setting VAL in the db file. pass1 is not like a caput, it does
not cause the record to process, because it is all still done before iocInit.
It has to do with the timing relative to when links have been established I
think.
vxWorks typically has no local disk, and NFS is the preferred file system.
For computer-based IOC you don't need to worry about, you can just save to a
local disk.
Mark
________________________________
From: Emmanuel Mayssat [mailto:[email protected]] Sent: Wed
4/16/2008 7:11 PM To: Mark Rivers Cc: epics Subject: RE: autosave issues
Mark,
I implemented autosave relatively easily thanks to the documentation. For the
set_passX_restoreFile functions, it says that only 8 files can be restored at
each pass.
This is rather an important limitation if I have a restore file per device
(and not 1 per ioc). Is this limitation still applicable?
Is doing a restore at pass0 equivalent to setting the VAL fields in the db
file? For pass1, is it equivalent to having several caputs on a running ioc?
Why do they recommend saving vxWorks station over NFS? I assume it is only
because of a storage space limitation. If that is the case, then it is not
applicable for computer-based IOC. Isn't it?
Regards,
-- E
On Tue, 2008-04-15 at 21:22 -0500, Mark Rivers wrote:
The problems are probably less frequent than that. And a beamline might be
4 IOCs.
The issues tend to arise during power or network failures when the vxWorks
VME IOC is in the middle of saving the file via NFS.
There are safeguards now in place that make this much less likely. And
there are backup files created by the autosave system that can be recovered
from.
Mark
________________________________
From: [email protected] on behalf of Emmanuel Mayssat Sent: Tue
4/15/2008 8:35 PM To: epics Subject: autosave issues
Hello again,
I was looking at autosave record/functions. I read that APS is experiencing
at least 1 autosave issue per beamline, per year. Can anyone expend on
that?
I assume that files are being corrupted or such... How could that happen?
-- Emmanuel