Maximum Transmission Unit (MTU) of the WAN interface of the SonicWall. Network issues can be mixed with a range of different ones, but more importantly, network can be a very complex system, so it helps a lot when network people know what exactly to look for. Enabling this option would fragment packets even though the Don't Fragment bit is set. The tools can also combine NetFlow, J-Flow, sFlow, NetStream, and IPFIX data built into most routers to … julian.hanzlik. originating from some slowness on the primary database itself, like slow local redo I/O): you just look at what LGWR was doing during that time using either AWR, ASH or trace files. When synchronous DataGuard is added to the setup, redo processing becomes much more complex, and dependent on more processes, more branches of internal database (or DataGuard) code and more elements of infrastructure. Increases in throughput when removing the SonicWall from the physical network are expected but it is important to have information on speeds with and without the SonicWall in place for further troubleshooting. For example, maximum throughput using 100-PRB carrier will require a more powerful CPU than maximum throughput using a 25-PRB carrier. • Protocol related issues. Change ), You are commenting using your Twitter account. In some cases it is also possible for packets to arrive to the destination out of order (when network paths are parallelized). It is equally important for DBAs and SAs to understand the network specialists, because in all but most trivial cases, fixing network issues is an iterative process which requires constant feedback every step of the way. Troubleshooting Steps Test the user claims by checking the speed/throughput using some tool like Iperf, setting up FTP server on the LAN etc or any other tool. A couple of caveats at this point: as far as the database side of things is concerned, I only worked with DataGuard on 11g, so that’s what I’m basing my observations on. Devices such as routers, switches, and firewalls have been designed to handle certain network throughput. In the case of the network with video jitter issue, I filtered on port 1935 and the relevant IP, which gave us this result n the IO graph: This is not very good performance wise. I imagine that they could also manifest themselves via other redo-related waits, such as «log buffer space», but in practice, if the primary database commits frequently enough, it’s going to be primarily «log file sync» waits, since commit introduces a mandatory sychronization point for redo processing. Previous Post Troubleshooting network throughput issues in Oracle Data Guard. By default all Interfaces on the SonicWall are set to automatically detect link speed. If the firewall is not under any stress whatsoever while transferring data, the problem likely lies elsewhere. If your machine is not powerful enough to support srsENB with a given network configuration, you will see Late and/or … Adobe Experience League. 1.2.1. It is best to rule out all other network devices as a possible bottleneck by using two computers with iPerf3 installed and connected directly to the LAN interface of each radio. Troubleshooting network communication issues in Datadog APM; Debug application issues with NPM . TIP: Disable Bandwidth Management if not required via Firewall Settings | Bandwidth Management on the SonicWall GUI. TCP flows slow down when there is packet loss or packet delay on the network. Let me summarize the main points: Fill in your details below or click an icon to log in: You are commenting using your WordPress.com account. Despite very powerful instrumentation provided by Oracle, it is not an easy task. The reason is, obviously, same as above — standby is a read only database, and cannot have any «actual» data of its own. There are many factors that impact throughput before packets egress the SonicWall and make the return trip to the host that's performing the speed test. Enter your email address to follow this blog and receive notifications of new posts by email. X$ tables and V$/GV$ views based on them are, however, different, so they (and first of all, V$ASH/GV$ASH) become the main source of diagnostic information on the database side. I have issues with limiting DL throughput. Troubleshoot a device. Bandwidth management will cause throughput degradation if incorrectly configured. Latency is the delay introduced by the network. So there’s many more places where things can go wrong — or if we specifically focus on performance, where things can go slow. TIP:Isolate the affected host and remove it from the network. Ed Sperling None. It has been shown by Mathis that regardless to those details, the upper limit for TCP throughput in presence of packet loss is given by the following formula: where RTT is the round trip time and p is the packet loss. TIP: Perform a Path Ping to the network or IP Address that you're testing to. Network Performance & Throughput Issues Hi We are using ISR 4300 Series routers and we are having bandwidth issues with Speeds on the WAN side when connected to the router, i am not sure if the issue is with my Firewall or my router confg. For example, if the average size of the congestion window is 10 MSS-sized (1500 bytes, or 1460 without the header info) packets, and the round trip time is 5 ms, then the transmission will be limited to 14,600 bytes per 5 ms, or 2,920,000 bytes per second. 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