Mirror image has two meanings. One is that two or more servers whose contents are exactly the same and updated synchronously on the Internet, except the main server, are all called mirror servers, in order not to interrupt the service when the main server fails to serve; Another meaning refers to the packaging file of a disk made by software such as GHOST or HD COPY, which can restore the contents of this disk in the future and easily copy the same contents to other disks.

2. What is an image file?

The image file is actually an independent file. Different from other files, it is made of multiple files by burning software or mirror file making tools.

Image files are widely used, and the most common application is data backup (such as floppy disk and CD-ROM). With the popularization of broadband network, some download websites also download files in ISO format, which facilitates the production and delivery of software CDs. Common image file formats are ISO, BIN, TAO, DAO, CIF and so on.

3. What is a mirror volume?

Using mirrored volumes, that is, RAID- 1 volumes, users' same data can be copied to two physical disks at the same time. If the physical disk fails, although the data on this disk will be unusable, the system can continue to use another disk that is still running normally to read and write data. Its main purpose is to protect the data on the disk from media failure by keeping a completely redundant copy on another disk.

It can be seen that the disk space utilization rate of the mirror volume is only 50% (each group of data has two members), so the cost of the mirror volume is relatively high.

To create a mirrored volume, you must use free space on another disk. Any existing volume in a dynamic disk (even the system volume and the boot volume) can be mirrored to the same or larger volume on other disks using the same or different controllers.

It is recommended to use the same disk size, model and manufacturer as the mirror volume to avoid possible compatibility errors.

The mirror volume enhances the reading performance, and the fault-tolerant driver can read data from two members at the same time, so the speed of reading data will increase. Of course, because the fault-tolerant driver must write data to two members at the same time, the writing performance will be slightly reduced.

A mirrored volume can contain any partition (including boot partition or system partition), but both hard disks in the mirrored volume must be Windows 2000 dynamic disks.

4. What is port mirroring?

Switches divide network traffic through switch ports, thus improving network performance and reliability. It is a challenge for network analysis tools to separate error data from captured traffic.

In order to solve the problem of analyzing switching networks, switch manufacturers provide a function called "port mirroring". The switch port mirroring function copies the port traffic from the designated switch port to the mirror port for traffic and protocol analysis.

5. What is a mirror website?

The so-called mirror station is to put your existing website on a server in another place. Of course, this server can be purchased and hosted by you, or it can be a virtual server. If you put your webpage on servers in more than two different countries or regions, it means that you have set up multiple mirror stations for your website, which can speed up your website's access.

A mirror website is to put an identical site on several servers, and each server has its own URL. These servers are mirror websites. It is not much different from the main station, and can also be regarded as a backup measure of the main station. The advantage of having a mirror website is that if you can't access the main station normally (for example, a server dies or an accident happens), you can still browse other servers normally. Relatively speaking, the master station is slightly better than the mirror station in speed and so on.

6. What is a mirrored BIOS?

Mirror BIOS can protect and back up the BIOS system and prevent the motherboard from starting up due to BIOS errors.

Mirror BIOS always copies the BIOS image to the backup BIOS. When the main BIOS cannot be started, it can be started from the backup BIOS by changing the switch.

7. What is an optical disk mirror server?

CD-ROM mirror server is a NAS CD-ROM network * * * sharing device which combines CD-ROM technology, hard disk technology and general server technology and is designed for CD-ROM network * * *. The CD-ROM mirror server itself does not have the complicated operating system and hardware connection of the general server, but only completes the data transmission between the hard disk data of the CD-ROM mirror server and the client, so that the client can enjoy the information resources on the CD at the access speed of the hard disk, eliminating the bottleneck problem of the CD-ROM drive and greatly improving the performance of the CD-ROM network.

A CD-ROM mirror server looks like a CD-ROM tower, but it generally has only one CD-ROM drive. The network administrator can mirror the CD to the hard disk of the server through the CD-ROM drive on the CD-ROM mirror server, or remotely mirror the CD to the hard disk of the CD-ROM mirror server by using the CD-ROM drive on the network server or client.

The CD-ROM mirror server generally adopts BNC and RJ-45 standard network interfaces, so it can directly access the Internet without any network file server and does not need to install any software on the network server and client. Users only need to connect the network cable to the network hub, plug in the power supply and start using it. The setup, upgrade and management of the CD-ROM mirror server can be done remotely through a web browser or online neighbors, without the need for network administrators to run around. When the CD mirror server fails, it will only affect the access of its own files, and will not affect the normal operation of the whole network.

At present, a common problem encountered by all network systems is the large traffic, which affects the data access time. In order to solve this problem, the general server is usually connected to the high-speed section of the network or the backbone network, but this will cause great pressure on the backbone network. The CD-ROM mirror server can be directly connected to any place in the network, or placed on the local network segment with the highest access frequency, thus shortening the access time of users and improving the network throughput.

The CD-ROM mirror server itself is a WWW server, and the client can directly and remotely access and retrieve the CD-ROM server through the WWW browser. CD-ROM mirror server generally supports Windows NT, UNIX, NetWare and other network operating systems, and has strong accessibility. The CD-ROM mirror server also has strong scalability. Users can add hard disks to the CD mirror server according to the actual situation to expand the server capacity. China Tsinghua Tongfang Optical Disc Co., Ltd. adopts the all-Chinese universal server operating system. Users can name each CD in Chinese when mirroring it, which brings great convenience to domestic users.

The CD mirror server separates the information storage and reading functions of the CD, and enjoys the CD information resources by virtue of the high-speed access ability of the hard disk, so the access speed of the CD mirror server is several times faster than that of the CD library or the CD tower. The performance indexes such as capacity and speed of CD mirror server are better than those of CD library and CD tower, but its unit cost (equipment cost allocated to each CD) is much lower than that of CD library and CD tower. CD-ROM mirror server provides a cost-effective solution for users such as schools, libraries, archives, design institutes, hospitals, companies and government agencies. At present, the optical disk mirror server has gradually replaced the optical disk library and the optical disk tower and become the mainstream product of the optical disk network.

At present, the devices for storing optical discs are mainly divided into the following categories:

1.SCSI jukebox)-"CD SERV"

The first-generation optical disk library, referred to as "optical disk tower" for short, has been eliminated because of its small capacity (7 or 14 optical drives), slow speed and easy damage, and does not support simultaneous access by multiple users.

2.IDE CD server-"FISCC CD"

The second-generation optical disk library, referred to as "optical disk server" for short, adopts brand-new "thin server" slimming server technology, high-speed central processing unit, large-capacity memory, and universal IDE interface, which makes user operation and maintenance simpler and supports concurrent multi-user simultaneous access. This kind of products are now among the obsolete products because they can't connect to the hard disk, and their speed and storage capacity are limited by the optical drive.

3. Network Ready CD Mirror Server-"FISC CDM"

The third generation product, referred to as "mirror CD server", has excellent cost performance and can mount 8 IDE high-capacity and high-speed hard disks at the same time. This product makes full use of the high speed and large capacity of hard disk, and it is the fastest optical disk server in the same product series in the world at present.

4. Multifunctional network storage server (network-ready CD image &; File server)-"fiscal CDH"

The fourth generation product, a new generation of network storage equipment, integrates "optical disk mirror storage" and "NAS function".

8. What is a CD image file?

The so-called CD-ROM image file is also called CD-ROM image file or ISO file, and its storage format is the same as that of the CD-ROM file system, which can truly reflect the contents of the burned CD.

Standard CD image files have the extension (. iso)。 You can make an entire CD or hard disk file into a CD image file. The production software includes: WinISO, UltraISO, ActiveISO, CDIMAGE, etc. The content to be burned can be made into a mirror image of the CD and then burned, which can greatly reduce the probability of lettering damage.

CD-ROM image files, also known as CD-ROM image files, have many formats and types. There are two main categories: binary format and music. The universal music CD image file is a wave file with the extension:. Whoa, whoa. Because. Wav file is too large, and compression formats such as APE and MP3 are also used. In addition, the image file of music CD captured by CloneCD is in binary file format.