Based on the calculations I’ve already presented you can also gauge percent utilization etc. The frequency of spikes dictates the utilization of bandwidth. Use of histograms and pivot tables make this task easier. With 2 Gig, you can get downloads of up to 2 gigabits per second and uploads of up to 1 gigabit per second using a wired connection as long as your cables, ports, and device are capable of the. Collect the data for a day, week, or even a month and then import it into Excel and chart the frequency of bandwidth utilization. In order to really figure out whether you have a real bottleneck within your FC network setup a tool which polls FC port throughput details with a high frequency. And this isn’t even approaching application layer inefficiencies. You can see how the specific environment components can make a huge difference when looking at the “maximum through put” of an FC link. 1 Megabit per Second: 1 Megabit per second is equal to 1,000,000 bits per second. If each host thinks it has a 4Gb/s FC link then you can quickly see where a potential bottleneck lies. If each of the 6 ports pushes as much I/O as possible at the same time each port will max out at a theoretical 2Gb/s. An example would be if a group of say 6 ports share 12Gb/s of bandwidth. Depending on the switch vendor and the size of your fabric different over subscription ratios may exist. It’s also important to keep in mind the port constraints of the fabric. PCI-Express slot which would give you a limit of 133MB/s vs. Get the fastest internet plans, including speeds up to 2 GIG & 5 GIG, with no annual contract and no data caps. In some cases the physical server hardware is a constraint. AT&T Fiber is rated 1 in perceived value. In most high volume FC networks I’ve worked in the actual fabric isn’t the bottleneck. To be quite honest I’m not sure whether there is a similar overhead ratio with Fibre Channel(FC) networks. HBA throughput speed is directly impacted by the bus speed of each HBA as well as whether the switch ports utilized by either the storage array FA’s or the HBA itself are dedicated bandwidth or over subscribed ports.Įxcellent question. Now that we have determined the maximum throughput of each HBA we need to rule out any bottlenecks found in the server itself or in the SAN fabric. Bellow I’ve outlined speeds for 4Gb and 8Gb FC. Since FC speeds have tripled since I wrote this post an update is in order. Bellow I’ve broken down the values for each common throughput value. Convert 29085 Gigabytes/Second to Megabits/Second (29085 GBps to Mbps) with our Data Transfer Rate converter. Bellow I will outline the required calculations for determining the maximum throughput speed of 2 Gigabit Fibre Channel.Ĭalculating Maximum Throughput for 2 Gigabit Fibre Channel in MegaBytesĠ.25 GigaBytes x 2 (2 HBAs) = 0.5 GigaBytesĠ.5 x 1024 = 512 MegaBytes/sec throughput or 256 MB/sec per HBA.ĭepending on the monitoring software used performance numbers may not be in MB format. Knowing the maximum throughput speed of your network is key to remove it as a possible bottlekneck. With storage area networks (SAN) performance issues sometimes arrise.
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