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Software for Symbol MC9090

Posted on 2010-09-02
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Last Modified: 2013-12-21
Currently, I have 250 Symbol MC9090 scan guns. Our new ERP system needs these guns to connect to a Terminal server, which hits the ERP app and connects to the Database server. The issue I have is the RDP session is just too heavy, I need another program that can make remote connections to the terminal server. I have experience with VNC , but I cannot find a VNC product that can make terminal sessions.
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Question by:MISOperations
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by:bclongacre
ID: 33589768
Can you set up a second terminal server so you can split the load, and configure x % of your guns to initiate a session for each server?

May I ask what ERP Software you are using?  I have a similar environment, however, not as many users, and we can pull the weight on a single box.  But we are utilizing Terminal Services through the MC9090 to access the ADC portion of our ERP solution.

Would adding additional processor(s) and RAM be an option, or are you already close to your limit for upgrading the box?
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by:MISOperations
ID: 33589835
Were splitting load between 6 Terminal servers. Were using a product called Simparel. I dont think the server hardware is the issue, just using a single gun, connected to a quad core and 32 gig of ram were getting bad wait times
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by:bclongacre
ID: 33589902
I would tend to agree, that it seems like it is not a hardware constraint based on your testing w/ one gun and one server.

Do you experience similar lag when you connect a laptop to your wireless network and use Terminal Services?  Do you have enough bandwidth available for all of your MC9090s, any chance you have a single pinch point in your network that is adding latency/delays?  Software/hardware firewall inspecting all of the packets?  At peak how many devices are connecting to each of your APs?  Do you have a AP controller managing all of the traffic between APs and devices, are you at or near capacity?

You may also want to run some packet captures on traffic to and from one of your MC9090's to help determine if there is possibly something in/on your network things down for you.

I am not familiar with that specific ERP application, we utilize Microsoft Dynamics NAV, which operates in a similar manner.  
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by:MISOperations
ID: 33590107
Hard to answer currently we're running 30-40 MC9090s but there all running the old system which is telnet to an AS400, so its incredibly fast.  Im worried that when 30 MC9090s running RDP connect through the same link the bandwidth required will be too much. Were currently connected to to the site using a 1.5 MB MPLS connection, Im certain that a 4-5 mb connection will be required to maintain the same speed we currently have.
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bclongacre earned 500 total points
ID: 33590866
If I remember correctly RDP needs roughly 32-64 kps per connection... typically you need to ensure you have a very low latency as well, the number we were told we "needed" was less than 50ms between the server and the mc9090, we were supposed to target <30ms, which may be part of your problem.  So your servers are not on the site w/ the MC9090's correct?
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by:MISOperations
ID: 33597136
no, we put a terminal server at the location and had it communicate back to the DB, but the guns were slower. Currently all TRM servers are at the main location with the DB and the remote site guns are connecting back to the TRM at the main site.
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by:bclongacre
ID: 33597308
When you were using the AS400, you were doing direct telnet to the system, however, now you are using terminal services, to access a terminal server, which then connects to another server off site, correct.  So you have an additional system in the midst now, if I understand your situation correctly.  Also something we ran into when switching ERP systems is our new system sends and receives vastly more SQL queries/traffic than our previous one.  We encountered more significant slowdown for our remote site users with our new system than the old one.  Also our newer ERP system, we have found, is unbearable if running on a terminal server that is not at the same site as our db server, otherwise its a matter of click, or type and wait 3-15 seconds for the displayed information to refresh, because its all populated by SQL queries at its core, as opposed to the old system where all transactions were strictly resident on the server w/ value entries displayed on the client and value entry fields sending the values to the server for processing.

I know that may sound like a long anecdotal story, however, I could not think of a way to efficiently explain it without giving an example of something we have experienced.

It may be worth checking with your vendor/developer to see if you can find out if you are possibly looking at the delay being caused by the volume of data that is needing to be transmitted and at what point in the path the data is processed.  If the processing is happening on your actual terminal servers, which are sending requests and then processing those requests across your MPLS connection to your remote location that houses your DB server, you may be vastly overwhelming your bandwidth.

Do you have other options?  We have been fortunate to find a local provider that is part of a co-op, the co-op is tied directly into a Tier 1 provider, will be getting fiber to our server room 10meg/10meg w/ a block of statics for 150/month... with the option to bump up to 10gig/10gig if/as needed.  If you can find a local/smaller provider who is trying to expand, you may have a good shot at getting a decent bandwidth deal, if you have to work w/ the big guys, well... your cost goes through the roof.
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