JP2000222271A - Proxy/cache server - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a proxy/cache server capable of speedily restarting the operation of the server when the operation of the server is stopped. SOLUTION: Concerning a proxy/cache server 1, a hard disk 2 for system and a hard disk 3 for cache data are mutually independently provided, the hard disk 2 for system is made into exchangeable hard disk and equipped with a spare hard disk, the hard disk 3 for cache data is divided into two hard disk partitions 3a and 3b, the hard disk partition 3a is usually used and when the hard disk partition 3a is damaged, it is switched to the hard disk partition 3b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a proxy / cache server, and more particularly to a proxy / cache server that can easily recover from a server operation stop.

[0002]

2. Description of the Related Art The use of networks has become widespread for the purpose of exchanging information. Information exchange used on a network is generally referred to as a mail using a protocol called a simple mail transfer protocol (smtp) or an http protocol using a protocol generally called a TCP / IP as a base. Many means are used as homepages. In addition, a file transfer protocol using a network called a file transfer protocol (ftp) is often used.

[0003] When http is used in these protocols, a server for providing a large amount of information is currently prepared on the Internet, and servers are installed in various places in a network in a company, and new information is constantly provided. It is operated so that it can provide.

[0004] However, there are many servers, and the specific format of the information handled is not only text, such as e-mail, but also various types of image data and audio data, and as a result, the network or the Internet is used. That's a lot of traffic and a big obstacle to providing information. Also, maintaining security becomes difficult.

[0005] One of the means for solving such a situation is to use a proxy server. By making a request to this proxy server from a client (a browser in this case), a plurality of requests can be combined into one. Further, by providing the proxy server with a cache server having a memory management function, the same data request can be reduced, and network traffic can be improved. A server provided with a cache server having a memory management function in the proxy server is called a proxy / cache server.

Further, by connecting the proxy / cache servers hierarchically as shown in FIG. 2, the burden on the network can be further reduced. In FIG. 2, reference numerals 11, 12 and 13 indicate proxy / cache servers, and reference numerals 15, 16 and 17 indicate clients. As a server for such purpose, sq
uid and delegate are used. In fact, proxy /
When a cache server is incorporated in a network and used, if the server stops operating for some reason, the flow of information will be stopped unless the server is restored as soon as possible.

[0007]

For this purpose, the following measures have conventionally been taken. (A) This method is to back up the contents stored in the hard disk of the host computer used for the proxy / cache server to a magnetic tape device or the like. In this method, when the storage contents of the hard disk are lost, it takes time to restore the storage contents for making the server newly function from the magnetic tape device to the hard disk, and it is difficult to recover the server in a short time. In addition, there is a problem that the contents of the magnetic tape and the contents of the disc are inconsistent.

(B) This is a method in which a single substitute host computer is prepared. In such a case, one host computer is always allowed to play, which is uneconomical and the prepared host computer is only hardware, so the hard disk of the operating host computer is used. However, there is a problem that the stored contents stored in the memory are completely invalidated.

(C) In particular, in the case of a proxy / cache server, when a plurality of servers are operated in advance by using an auto proxy technique and one of the servers stops operating, You can switch to using another server automatically.

However, in order to actually recover the server, one of the above methods (a) and (b) is required.
Until the recovery by the method (c), there is a problem that the traffic increases and the load is concentrated on the operating server until the recovery. Of course, there is a problem that this method cannot be realized and cannot be used in a small network.

[0011] It is an object of the present invention to provide a proxy / cache server capable of promptly resuming server operation when the server stops operating.

[0012]

According to the present invention, there is provided a proxy / cache server in which a system hard disk and a cache data hard disk are provided independently of each other, and the system hard disk is replaceable. A hard disk and a spare hard disk. It is characterized by having done.

According to the proxy / cache server of the present invention, since the system hard disk and the cache data hard disk are provided independently of each other in the proxy / cache server, the system hard disk is damaged. Sometimes,
The cache data is stored, and the server operation can be restored by replacing the system hard disk with a spare system hard disk.

Further, according to the proxy / cache server of the present invention, even if the hard disk partition area used in the cache data hard disk is damaged, the system information on the spare system hard disk is stored. To replace the damaged hard disk partition with another undamaged hard disk partition,
Server operation can be restored in a short time.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION
The cache server will be described according to an embodiment.

FIG. 1 is a schematic block diagram showing the configuration of a cache server according to one embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes a proxy / cache server. The host computer of the proxy / cache server 1 uses a hard disk as a memory. However, a hard disk storing an OS and an execution program of the proxy / cache server 1 and the like (a hard disk storing an OS and an execution program of the proxy / cache server 1 and the like is also referred to as a system hard disk) 2 and a cached hard disk A hard disk for cache data in which only cached data is stored (a hard disk for cache data in which only cached data is stored is also referred to as a hard disk for cache data) 3.

Further, a replaceable hard disk for the system is used, and a spare hard disk in which an execution program and the like are stored in advance is prepared.

Hard disk 3 for cache data
Are divided into at least two or more. In the embodiment of the present invention, a case where the hard disk is divided into two is illustrated, and the hard disk partitions are indicated by hard disk partitions 3a and 3b, respectively. The hard disk 3 for cache data is configured so that, for example, if one of the hard disk partitions 3a becomes defective, the other hard disk partition 3b can be used. In this case, the hard disk 3 for cache data may or may not be exchangeable.

In the proxy / cache server 1 configured as described above, if the system hard disk 2 containing the system or various daemons fails, the system hard disk 2 can be replaced. It can be dealt with simply by replacing it with a prepared spare system hard disk. In this case, since the cache data hard disk 3 is independent of the system hard disk 2, there is no effect on the cache data, and the replaced spare system hard disk stores an execution program or the like in advance. Therefore, the server can be operated only by replacement.

Furthermore, in the proxy / cache server 1, since the system hard disk 2 is configured as described above, it is possible to easily repair the system hard disk when it crashes. Hard disk 3 for cache data in which cache data is stored
Is independent of the system hard disk 2, the cache efficiency to the cache data hard disk 3 is improved.

As described above, the proxy / cache server 1
Thus, even if the system hard disk 2 crashes, the cache data can be effectively used as it is. Furthermore, hard disk partition 3
Since the hard disk partition 3a is constantly used, the probability of damage to the area of the hard disk partition 3a increases. However, if the hard disk partition 3b is damaged, it can be dealt with by switching to the area of the hard disk partition 3b. The server operation of the server 1 can be restored.

Next, the recovery of the cache data hard disk 3 will be described. One hard disk 3 for cache data is physically composed of two file systems, and usually uses a hard disk partition 3a. If the area of the hard disk partition 3a becomes defective, the mounting destination on the system hard disk is changed. Specifically, it can be performed only by modifying / etc / fstab in the system hard disk 2 or changing the mount status by a command.
When using a command, unmount is executed once, and then a file system of another hard disk partition 3b is mounted at the same position. Therefore, the cache area can be changed without rebooting the system.

If the cache data hard disk 3 is not partitioned into the hard disk partitions 3a and 3b, it takes time to replace the cache data hard disk and it takes time to restore the proxy / cache server 1. become.

Further, since the hard disk 2 for the system and the hard disk 3 for the cache data are provided independently, even if the area of the hard disk partition 3a becomes defective, the entire proxy / cache server 1 is stopped and the cache data It is not necessary to replace the hard disk, and it is sufficient to switch to the area of the other hard disk partition 3b, so that the proxy / cache server 1 can be restored in a short time.

[0026]

As described above, according to the proxy / cache server of the present invention, since the system hard disk and the cache data hard disk are provided independently, access to the cache data hard disk is frequent. However, the effect that the cache speed is improved can be obtained. Further, even when the system hard disk fails, the cache data can be saved.

Further, according to the proxy / cache server of the present invention, the hard disk for cache data is divided into a plurality of partitions (file systems) and uses one of the partitions, and the area is unusable. When it becomes possible, the remaining partitions are used for storing cache data, so that the effect of reducing the suspension period of the server operation can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic block diagram illustrating a configuration of a proxy / cache server according to an embodiment of the present invention.

FIG. 2 is a schematic block diagram illustrating a configuration of a hierarchical proxy / cache server.

[Explanation of symbols]

 1 Proxy / cache server 2 Hard disk for system 3 Hard disk for cache data 3a and 3b Hard disk partition

Claims (1)

[Claims] In a proxy / cache server, a system hard disk and a cache data hard disk are provided independently of each other, the system hard disk is a replaceable hard disk, and a spare hard disk is provided. A proxy / cache server wherein a hard disk is divided into a plurality of hard disk partitions, and when a hard disk partition being used is damaged, the hard disk partition is switched to another hard disk partition which is not damaged.