Experimental Physics and Industrial Control System
Hi all,
today we observed a strange problem with a third party EPICS system.
The IOC has booted without errors, you can rlogin to the ioc, you can list
the channels with dbl, but none of the channels is accessible via channel
access. Neither from the boot PC nor from a second PC that works fine in
our setup.
The message from the command caget is the same on both PCs:
link:{Search Pend-IO: } ALIRF-A1:CLEAR
# ALIRF-A1:CLEAR NOT FOUND
The two PCs and the IOC are connected in a stand-allone network. Both PC
are running linux, the boot PC SuSE 6.1 and the other PC Redhat 5.2. The
IOC is a PowerPC mv2306. The company claims that everything worked fine
with another PC running SuSE 6.0 before they shipped everything to the
SLS. They tested it on the last day before shipping and the new PC didn't
worked there from the start while the SuSE 6.0 worked fine. They didn't
had time left to solve it then and have to solve it here now.
We were running the debug programm tcpdump -i eth0 -vv with
the output:
[...] linboot.ioc.1066 > 192.168.255.255.5064: udp 32 (ttl 64, id [...])
for several times after a caget command. "linboot" is the boot
PC and 192.168.10.15 is the IP address of the IOC, 192.168.10.200 the address
of the boot PC (.201 of the second one). The IOC doesn't respond to that,
just sending periodically
[...] iocLin.ioc.1031 > 192.168.10.255.5065: udp 16 (ttl 30, id [...])
Running spy on the IOC says that it is 98% idle. I'm sorry about
the small amount of information I can give. Any guess is welcome, because
we tried for several hours today to find the source of the problem and
have no clue left.
- Andreas
--
Andreas Luedeke, Controls Group, Swiss-Light-Source, PSI
mailto:[email protected], tel:+41-(0)56-310-4002, fax:-3351
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