CN102521063A - Shared storage method suitable for migration and fault tolerance of virtual machine - Google Patents
Shared storage method suitable for migration and fault tolerance of virtual machine Download PDFInfo
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Abstract
The invention relates to the field of cloud calculation, in particular to a shared storage method suitable for migration and fault tolerance of a virtual machine. According to the invention, a data storage server and a metadata server are respectively loaded with a network driving module; the metadata server actively searches each data storage server on the network through a fixed multicast group method; and each data storage server actively adds into a network storage cluster after identifying the metadata server through key words information. By adopting the method, the failure and transmission problems of an integrated storage system can be effectively solved; and the method can be widely used for storage of migration and fault tolerance of the virtual machine.
Description
Technical field
The present invention relates to the cloud computing field, especially a kind of virtual machine (vm) migration and fault-tolerant shared storage means of being applicable to.
Background technology
Cloud computing (Cloud Computing) is the new term that is born in 2007, does not still have the definition of generally acknowledging at present.Cloud computing is a kind of commercial computation model, and it on the resource pool that great amount of calculation mechanism becomes, makes the user can obtain computing power, storage space and information service as required calculation task branch.And cloud computing operating system is the holistic management operation system on cloud computing backstage, and it is meant that framework is in the underlying hardware of basic software management magnanimity such as underlying hardware resource such as server, storage, network and single-set operation system, middleware, database, the cloud platform total management system on the soft resources.
Distributed file system (Distributed File System) is meant that the physical store resource of file system management not necessarily directly is connected on the local node, but links to each other with node through computer network.The design of distributed file system is based on Client.A typical network possibly comprise the server of a plurality of confession multi-user accesses.In addition, reciprocity characteristic allows some systems to play the part of the dual role of client-server.For example, the user can " deliver " catalogue that allows other client access, in case visited, this catalogue concerning client computer as using local drive.
Cloud computing platform is when carrying out system migration and System Fault Tolerance, and there is Single Point of Faliure in the traditional centralized storage system, and the not high phenomenon of transmission performance.
Summary of the invention
The technical matters that the present invention solves is to provide a kind of virtual machine (vm) migration and fault-tolerant shared storage means of being applicable to, effectively solves the centralised storage system and has fault, transmission property problem.
The technical scheme that the present invention solves the problems of the technologies described above is:
Data storage server and meta data server be the load networks driver module respectively; By meta data server with each data storage server on the fixing multi-broadcast group mode active searching network; Each data storage server passes through keyword message; Behind the identification meta data server, initiatively add network storage cluster.
Data can be specified a plurality of backups according to configuration file on data storage server; Simultaneously can specify a plurality of meta data servers; The meta data server machine of delaying because of offered load is too high is provided, or fault-tolerant when situation such as reading and writing data mistake takes place on the data storage server.
Specifically comprise the steps:
In the 1st step, physical server is shared storage directory as host's carry of virtual machine, is used to deposit the image file of virtual machine;
The 2nd step, on physical server, to create virtual machine, and be kept at the image file of virtual machine under the shared storage directory of carry, the virtual machine image file form of support comprises Raw and VHD etc.;
The 3rd step; Share the client elder generation accesses meta-data server of storage on the physical server; Meta data server is according to the distributed store record on each data storage server of HASH algorithm statistics; Follow the principle of balanced load rate simultaneously and give virtual machine image file memory allocated space, in addition, virtual machine image file can be created the loss of data of a plurality of backups to prevent that Single Point of Faliure from causing according to configuration;
In the 4th step, physical server carries out IO with data server and communicates by letter according to the space path that distributes, and is kept at virtual machine image file under the specified path under the data server;
The 5th the step, virtual machine (vm) migration and fault-tolerant in, the original physical machine discharges the shared resource of virtual machine earlier;
In the 6th step, the machine-readable listed files of getting under the share directory of target physical finds virtual machine image file;
In the 7th step, the target physical machine is applied for the resource of virtual machine again and is taken over the image file of virtual machine.
Adopt method of the present invention, can improve virtual machine (vm) migration and fault-tolerant speed effectively, not traffic affecting operation, the availability of raising virtual machine image.
Description of drawings
Below in conjunction with accompanying drawing the present invention is further specified:
Fig. 1 is the inventive method synoptic diagram;
Fig. 2 is a customer instance synoptic diagram of the present invention.
Embodiment
As shown in Figure 1, data storage server of the present invention abbreviates DS as, and meta data server abbreviates MS as; DS, MS load this network-driven module respectively, and with each DS on the fixing multi-broadcast group mode active searching network, each DS passes through keyword message by MS; After the identification of MS, initiatively add network storage cluster.
The present invention for sharing the storage system deployment platform, through self-defining operation system kernel characteristic, and the applying virtual patch, makes the network-in-dialing of system's virtual support machine, I/O storage, distributed storage etc. with the Iinux2.6.38.2 kernel.
The present invention adopts linux network distribution type transmission algorithm; Based on the linux operating system characteristic of increasing income; Through the communication module between each node of the form encapsulation network storage that drives, to adapt to the driving of distributed storage, called after gcloud-dnet.ko; Replace original system drive Inet, with the virtual support application.
The present invention on the basis of revising Iinux2.6.38.2 kernel source code, make distributed memory system support beyond the traditional document system format (ext2, ext3, ext4, ntfs fat), also supports the VHD virtual disk form that Microsoft releases.
On the basis of revising Iinux2.6.38.2 kernel source code; Drive through revising original distributed storage I/O; Come the distributed store record of statistics on each DS,, improve client reading of data efficient through fast distributed HASH algorithm; Balancing network I/O load factor improves the overall performance of storage.
The data storage multiple spot ensures that data can be specified a plurality of backups according to configuration file on DS, can specify a plurality of MS simultaneously, and MS is provided the machine of delaying because of offered load is too high, or the fault-tolerant networks of DS when going up situation such as reading and writing data mistake and taking place.
The present invention includes following implementation step:
In the 1st step, physical server is shared storage directory as host's carry of virtual machine, is used to deposit the image file of virtual machine;
The 2nd step, on physical server, to create virtual machine, and be kept at the image file of virtual machine under the shared storage directory of carry, the virtual machine image file form of support comprises Raw and VHD etc.;
The 3rd step; Share the client elder generation accesses meta-data server of storage on the physical server; Meta data server is according to the distributed store record on each DS of HASH algorithm statistics; Follow the principle of balanced load rate simultaneously and give virtual machine image file memory allocated space, in addition, virtual machine image file can be created the loss of data of a plurality of backups to prevent that Single Point of Faliure from causing according to configuration;
In the 4th step, physical server carries out IO with data server and communicates by letter according to the space path that distributes, and is kept at virtual machine image file under the specified path under the database server;
The 5th the step, virtual machine (vm) migration and fault-tolerant in, the original physical machine discharges the shared resource of virtual machine earlier;
In the 6th step, the machine-readable listed files of getting under the share directory of target physical finds virtual machine image file;
In the 7th step, the target physical machine is applied for the resource of virtual machine again and is taken over the image file of virtual machine.
Particularly, the inventive method can have multiple realization, and a kind of implementation will be introduced in this part.Referring to Fig. 2, the present invention is applicable to that the concrete applying step of virtual machine (vm) migration and fault-tolerant shared storage means is following:
In the 1st step, we use the operating system of CentOS x86_64 as host, and the IP of two hosts is 192.168.1.6 and 192.168.1.7; The virtual kernel of operation Xen 4.0 on it; 192.168.1.6 the fully virtualized virtual machine name of last operation is called vm, id is 1, and virtual machine image file leave in/this share directory of vm under; Shared-file system is built with ceph, disposes as follows:
The 2nd step, suppose to have two DS, virtual machine image file has two copies, leaves in so respectively among the DS, and name is called vm.img Part1 and vm.img Part2.
The 3rd step, call the migration order of Libvirt and carry out virtual machine (vm) migration,
# is id that 1 virtual machine (vm) migration is on the host of 192.168.1.7 to the IP address
xm?migrate1?192.168.1.7
In the 4th step, virtual machine vm has operated on this physical machine of 192.168.1.7, and about 2 seconds of time spent, the pilot process network is less than 500 milliseconds trip time, can ignore to the influence of business, proves that the method is applicable to virtual machine (vm) migration and fault-tolerant.
Claims (3)
1. one kind is applicable to virtual machine (vm) migration and fault-tolerant shared storage means; It is characterized in that: data storage server and meta data server be the load networks driver module respectively; By meta data server with each data storage server on the fixing multi-broadcast group mode active searching network; Each data storage server behind the identification meta data server, initiatively adds network storage cluster through keyword message.
2. according to the shared storage means shown in the claim 1; It is characterized in that: data can be specified a plurality of backups according to configuration file on data storage server; Simultaneously can specify a plurality of meta data servers; The meta data server machine of delaying because of offered load is too high is provided, or fault-tolerant when situation such as reading and writing data mistake takes place on the data storage server.
3. shared storage means according to claim 1 and 2 is characterized in that: specifically comprise the steps:
In the 1st step, physical server is shared storage directory as host's carry of virtual machine, is used to deposit the image file of virtual machine;
The 2nd step, on physical server, to create virtual machine, and be kept at the image file of virtual machine under the shared storage directory of carry, the virtual machine image file form of support comprises Raw and VHD etc.;
The 3rd step; Share the client elder generation accesses meta-data server of storage on the physical server; Meta data server is according to the distributed store record on each data storage server of HASH algorithm statistics; Follow the principle of balanced load rate simultaneously and give virtual machine image file memory allocated space, in addition, virtual machine image file can be created the loss of data of a plurality of backups to prevent that Single Point of Faliure from causing according to configuration;
In the 4th step, physical server carries out IO with data server and communicates by letter according to the space path that distributes, and is kept at virtual machine image file under the specified path under the data server;
The 5th the step, virtual machine (vm) migration and fault-tolerant in, the original physical machine discharges the shared resource of virtual machine earlier;
In the 6th step, the machine-readable listed files of getting under the share directory of target physical finds virtual machine image file;
In the 7th step, the target physical machine is applied for the resource of virtual machine again and is taken over the image file of virtual machine.
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