Virtual server - remote C-MOVE DICOM Error

Hi,

I noticed one behaviour that I cannot explain properly. I have a conquest setup as virtual server (in this case acting as virtual server for another conquest instances). I have a lua script in the virtual server that tries to CMOVE DICOM Study to specific defined AET (but still store it locally on the virtual):

local m, s;

if source == '(local)' then
   s = servercommand('get_param:MyACRNema');
else
   s = source;
end

m = newdicomobject();
m.PatientID = patientid;
m.StudyInstanceUID = studyuid;
m.QueryRetrieveLevel = 'STUDY';

dicommove(s, aet, m, 0, 'print(Global.StatusString)');

What often happens is that the CMOVE does not copy all the data (even thou the status string all images transferred). I get this error in the log:

Virtual server - remote C-MOVE DICOM Error code c004 (49156) from OTHERCONQUEST

and then I see the virtual server trying to fetch data from the second defined conquest instance (it will not find them there - there are only on the first one). Then comes the messages:

*** missing file: MAG0.0 ...
*** Could still not find file: ...
...

Then when I try to execute the same move second time, the virtual actually collect the missing data from the other conquest node (where it failed before) and sends complete study to defined AET.

Maybe somebody has easy solution for this. In a worst case I am thinking to change the script to the the first dicommove between data node and virtual server (repetitively until it collects all images) and then second dicommove to specific AET.

best

Tomas

Hi,

thanks for quick response. So I have seen this in two different setups (one research virtual in front of research nodes and one clinical virtual in front of clinical nodes):

* the virtual server is always Debian, 1.4.17d, with postgresql

* the other research node is Debian, 1.4.17d, with postgresql

* the other clinical node is Debian, 1.4.17d, with sqlite

No error shown on the actual data nodes, only warning:

Warning: use of as is compression for outgoing associations not fully implemented

Actual the out of database connections case would explain it (the other errors you describe sound more like the data would never be found, but I can fetch them on second movedicom execution). Do you know it is possible to setup connection pool for postgresql connection on conquest?

No the database is not shared, each node has its own database (actually each node has its own DB server).

I did increase the debug lvl but I really did not catch any error on data node. I will continue troubleshooting this, when I find something I will came back to you.

Could it help to change the behaviour of virtual server to fetch data per series instead of image by image (could lover the amount of queries on DB) or are there any bad consequences with such change.

I will probably also try to watch the number of active DB connections (default max is 100).

Hi Marcel,

it does not seem to be problem with DB connections (pg does not report problem and the number of connections is low). Changing

VirtualServerPerSeries0 = 1

improves the situation but, I can still get c004 error reported by virutal (the data node stays error free) only not so often.

When I adapt lua script to execute dicommove from first from all data nodes to virtual and then from virtual to final destination AET, this seem to work nicely. Do you know... is it possible to get list of configured data nodes on virtual server via lua (so that I don't have to hardcode them)?

Tomas