What is fcp in networking?
The time from when the page begins to load to when the content is rendered on the screen is measured by the FCP metric. Content is defined as text, images (including background images), and non-blank andLTcanvas elements.
The first text and image elements are rendered to the screen in the second frame of the above timeline load.
Some of the content has been rendered, but not all of it. First Contentful Paint and Largest Contentful Paint are intended to measure when the main content of the page has finished loading, and this distinction is important.
A First Contentful Paint of 1.8 seconds or less is what sites should strive for. The 75th percentile of page loads is a good threshold to measure to make sure you're hitting this goal for the majority of your users.
In the field or in the lab, FCP can be measured.
You can use the Paint TimingAPI to measure FCP. The following example shows how to create a PerformanceObserver that fetches a paint input with the name first-contentful-paint and logs it to the console.
When the first content item was displayed, the first-contentful-paint registered entry will give you the time. In some cases, this input is not valid for measuring.
There are differences between what the API reports and how the metric is calculated.
The web-vitals Javascript Library can be used to measure the differences, instead of having to memorize them.
The source code of getFCP is a complete example of how to measure FCP. It is not possible to measure LCP in JavaScript in some cases. The web-vitals limitations section has more information.
It has become the standard connection type for storage networks in the enterprise field because it was born to be used in the field of supercomputing. Fiber Channel signaling can work over both copper pairs and fiber optic cables.
The Fiber Channel Protocol is also known as the SCSI interface protocol over Fiber Channel.
The approval of the standard by the American National Standards Institute in 1994 made it possible to simplify the HIPPI system and use it for similar functions. The 50-pair cables and the small number of them made HIPPI limited.
The Fiber Channel was interesting for increasing distances and decreasing connections. It was later extended to allow a larger number of devices.
It provided support for a number of higher-level protocols, including SCSI, ATM, and IP, with the most frequent use being it.
A fiber channel link has two fibers that are in opposite directions.
The transmit port and receive port are attached to each fiber.
The three main fiber channel topologies can be distinguished by the connections between the different elements.
Two devices connect to each other directly in the point-to-point topology.
It is the simplest topology with only two elements.
All devices are in a loop or ring in the FC-AL design.
Activity on the ring is interrupted when an item is added or removed. The ring is interrupted by a device failure.
Fiber Channel hubs can connect multiple devices together. A ring can be made by connecting each port to the next item. The standard does not require that a ring between two devices function as a P2P connection.
All devices and loops are connected to Fiber Channel switches, which is similar to modern Ethernet implementations. The state of the medium is monitored by the switches.
Fiber Channel is a protocol with five layers.
The physical layers of Fiber Channel are known as FC-PH.
Fiber Channel implementations can be found at 1, 2 and 4 Gbit/s. An 8 Gbit/s standard is in the works. The 10 Gbit/s development is only used to connect switches. There are no 10 Gbit/s devices yet. The 10 Gbit/s standard will not be backward compatible with any of the slower implementations.
The following ports are defined in fiber channel.
Two classes of Fiber Channel switches fall into. This classification is not part of the standard.
McData andCisco have both fabric and director switches.
QLogic has fabric switches. If switches from different vendors are used in the same installation, they will work in "Interop mode", disabling some proprietary features.
All major systems, computer architectures, and buses are available with Host Bus Adapter.
Each HBA has a unique identifier (World Wide Name), similar to the MAC address in Ethernet in that it uses a unique identifier distributed by ranges among the manufacturers (distribution made by IEEE), and that serves the switch of the communication channel. fiber to identify the cards (HBA) that are connected to it.
WWNs are longer than 8bytes.
There are two types of WWNs on the same house.
