Strange errors? The syserr log is your friend.
I recently diagnosed an apparent compiler problem for an OpenVOS customer. He has two modules running OpenVOS Release 17.1. He was able to succesfully compile a program on one of them, but the gcc...
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Ports of CMake, libxml2, libxslt, Python, Rsync, et al are available
I have recently ported several new or updated open-source packages to OpenVOS Release 17.1. They are now available on the VOS anonymous ftp site, at the following URL:...
View ArticleSharing the Load – Multiple Processes Listening on the Same Port Number
Under STCP when you have multiple processes listening on the same port number only the first process that bound to the port number is notified when a connection is requested. One common way to slip...
View ArticleMessage Queue Anomalies
The CAC is frequently asked to look into problems with VOS message queues. Here are a couple of interesting ones, along with some solutions and recommendations that I’d like to share with you. Problem...
View ArticleIssues with newly registered users and SSH
Recently there have been reports of problems getting newly registered users logged in when using SSH. The SysAdmin registers Alice and then has Alice try to login via SSH. Alice reports an...
View ArticlePorting Open Source Software to OpenVOS Technical Webinar
Details: Paul Green will give an overview of the steps that you can follow to port open-source code to the Stratus OpenVOS operating system. He will review the OpenVOS POSIX environment, explain how to...
View ArticleTechnical Webinar on Porting Open-Source code to OpenVOS
Did you miss the webinar? Well, we have the video right here for you! Watch an overview of the steps that you can follow to port open-source code to the Stratus OpenVOS operating system. I review the...
View ArticleYou don’t exist go away
I’ve been ignored by post office clerks, bank tellers, and shoe salesmen, but never a computer – until now. (master_disk)>system>openssl>bin>ssh nd@127.0.0.1 You don't exist, go away! ready...
View ArticleImplementing PCI Standards on VOS (LTS/OnGuard) Technical Webinar
Industry regulations have changed dramatically in the last 20 years. Sarbanes-Oxley, PCI, and HIPAA have put in place requirements for much tighter security and control of computer environments than...
View ArticleA (very) simple log server for VOS
The OpenVOS architecture makes use of several independent systems; the NIO for X25 communication, the fiber channel disk array controllers, UPS for power, the RSN Internet Console Server for RSN over...
View ArticleMaximum Transmission Unit (MTU) versus Maximum Segment Size (MSS)
I have noticed some confusion between the Ethernet Maximum Transmission Unit (MTU) and the TCP Maximum Segment Size (MSS), hopefully the following will explain it. If you are still (or are now)...
View ArticleSSH keys: DSA versus RSA
On occasion, when explaining how to set up SSH’s public key authentication system, I am asked which is better, RSA or DSA keys. In the next few paragraphs I’ll attempt to answer that question. I’ll...
View ArticleDo you support left-handed widgets? Searching for solutions to technical...
I build products for a living. Often when I visit a Stratus customer, I’m asked a question of the form “Do you support left-handed widgets?” When I was a young, inexperienced engineer, I’d think for a...
View ArticleOpenVOS Network Application Performance Technical Webinar
Noah Davids, Support Engineer at Stratus discusses how application performance is affected by the network, the TCP stack and the application’s design. Covering common issues, how to test for them...
View ArticleHow active is that connection in the window?
The “netstat –interval X” command in releases prior to 17.0 will display a list of network connections every X seconds but you have no idea which if any of those connections are active or how active....
View ArticleVideo: Vos OSL Server Processes, How many do I really need?
The performance of applications that use cross module or cross system communication is dependent on having the correct number of OSL server processes running. Too few processes can dramatically slow...
View ArticleTaking the Scenic Route
Recently I dealt with a site that appeared to be having an issue with the link between their module and one of their Ethernet switches. As a test the system administrator, call him Fred, pinged the...
View ArticleTCP Backlog Capture
TCP Backlog capture is an effect that prevents a server application on the Stratus module listening on port X from successfully creating a connection with any client trying to connect to port X....
View ArticleSecuring the VOS Telnet Daemon
This talk will explain under what conditions it is safe to stop running the telnetd server and describe several approaches to prevent unwanted access to the module, via telnet, when it is not safe to...
View Articlepacket_monitor and the TCP options supported in OpenVOS 17.1
Starting with OpenVOS 17.1, STCP supports the time stamp, selective acknowledgment, and window scaling TCP options. This will allow for a more efficient data flow when TCP segments are dropped or when...
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