CN109522291B - Method and device for migrating file system and computer readable storage medium - Google Patents
Method and device for migrating file system and computer readable storage medium Download PDFInfo
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Abstract
The invention discloses a method for migrating a file system, which comprises the following steps: setting synchronous access parameters among cluster nodes, wherein the synchronous access parameters are used for identifying the state of service safety stop; reading the value of the synchronous access parameter when the file system is migrated between the cluster nodes; determining whether a file system structure needs to be checked according to the read value; if the read value is true, skipping checking the file system structure; if the read value is false or null, checking the file system structure. The invention also discloses a device for migrating the file system and a computer readable storage medium. The invention realizes that the migration speed of the file system among the cluster nodes of the storage system is accelerated while the data security is ensured.
Description
Technical Field
The present invention relates to the field of computer network technologies, and in particular, to a method and an apparatus for migrating a file system, and a computer-readable storage medium.
Background
In the fields of servers, storage and the like, in order to ensure continuous operation of services, the clustering technology is widely applied. By forming a cluster by a plurality of nodes, the service is operated on one or more nodes, and the service can still be continuously operated when a certain node cannot work.
A storage system cluster typically maintains a file system resource, i.e., one of the active nodes is responsible for file system structure, file caching, and access to memory. When the active node cannot work, the cluster migrates the file system to other nodes for operation, and the conditions of the failure include shutdown, upgrade, system failure, network failure and the like. Sometimes clusters are automatically migrated according to weight or load.
The resource migration may occur during the service operation, that is, the original node file system still has a moving connection, an unwritten cache, and the like, and at this time, the direct migration may cause data loss, file system damage, and the like, so that when a new node mounts a file system resource, the file system structure needs to be checked first to ensure safety. When the data volume of the file system is large, a lot of time is consumed for checking, the migration cannot be completed in a short time, and the business is represented as long-time suspension in a business layer. This is reasonable if the primary node fails, and unreasonable if it is due to normal migration, and the user experience is very poor.
Disclosure of Invention
In view of this, the present invention provides a method and an apparatus for migrating a file system, and a computer-readable storage medium, which are used to solve the technical problems that it takes a long time to migrate a file system normally, and migration cannot be completed safely and quickly.
In order to achieve the above object, a first aspect of the embodiments of the present invention provides a method for migrating a file system, where the method includes the following steps:
setting synchronous access parameters among cluster nodes, wherein the synchronous access parameters are used for identifying the state of service safety stop, and the cluster nodes comprise one or more nodes;
reading the value of the synchronous access parameter when the file system is migrated between the cluster nodes;
determining whether a file system structure needs to be checked according to the read value;
if the read value is true, skipping checking the file system structure;
if the read value is false or null, checking the file system structure.
Preferably, the method further comprises: setting the synchronous access parameter as true when the original node service is closed safely; when the original node service is not safely closed, setting the synchronous access parameter as false or null;
and the original node is one of the cluster nodes.
Preferably, the method further comprises:
the original node stops the upper layer service, submits the caching and unloading file system after the upper layer service is completely stopped, disconnects the connection with the memory after the file system is safely unloaded, and sets the synchronous access parameter as true;
if the upper layer service is overtime or the file system is not safely uninstalled, the fault is considered to occur, the original node service is not safely closed, and the synchronous access parameter is set to false or null.
Preferably, the method further comprises:
when a new node starts a service, connecting a memory, and reading the synchronous access parameter, wherein the new node is one of the cluster nodes;
if the synchronous access parameter value is true, clearing or setting the synchronous access parameter value as false, mounting the file system, skipping checking the structure of the file system after successful mounting, and normally starting the service by the new node, and if the mounting is unsuccessful, repairing;
if the synchronous access parameter value is not true, mounting the file system and checking the structure of the file system; when the file system is normal, the new node starts the service normally, otherwise, the repair is carried out.
Another aspect of the embodiments of the present invention further provides a device for migrating a file system, where the device includes:
the system comprises a setting module, a sending module and a processing module, wherein the setting module is used for setting synchronous access parameters among cluster nodes, the synchronous access parameters are used for identifying the state of service safety stop, and the cluster nodes comprise one or more nodes;
the reading module is used for reading the value of the synchronous access parameter when the file system is migrated between the cluster nodes;
the checking module is used for determining whether the file system structure needs to be checked according to the read value;
if the read value is true, skipping checking the file system structure;
if the read value is false or null, checking the file system structure.
Preferably, the setting module is further configured to:
setting the synchronous access parameter as true when the original node service is closed safely; setting the synchronous access parameter as false or null value when the original node service is not safely closed;
and the original node is one of the cluster nodes.
Preferably, the setting module is further configured to:
the original node stops the upper layer service, submits the caching and unloading file system after the upper layer service is completely stopped, disconnects the connection with the memory after the file system is safely unloaded, and sets the synchronous access parameter as true;
if the upper layer service is overtime or the file system is not safely uninstalled, the fault is considered to occur, the original node service is not safely closed, and the synchronous access parameter is set to false or null.
Preferably, the checking module is further configured to:
when a new node starts a service, connecting a memory, and reading the synchronous access parameter, wherein the new node is one of the cluster nodes;
if the synchronous access parameter value is true, clearing or setting the synchronous access parameter value to false, mounting the file system, skipping checking the structure of the file system after successful mounting, and normally starting the service by the new node, and if the mounting is unsuccessful, repairing;
if the synchronous access parameter value is not true, mounting the file system and checking the structure of the file system; when the file system is normal, the new node starts the service normally, otherwise, the repair is carried out.
The third aspect of the embodiments of the present invention further provides a computer-readable storage medium, which stores computer program instructions, where the instructions are executed by a processor to implement any one of the above methods for migrating a file system.
The method, the device and the computer readable storage medium for migrating the file system provided by the invention are used for setting synchronous access parameters among cluster nodes, wherein the synchronous access parameters are used for marking the state of service safety stop; reading the value of the synchronous access parameter when the file system is migrated between the cluster nodes; and determining whether the file system structure needs to be checked according to the reading result. Therefore, the invention provides a method for safely and quickly migrating a file system, which sets synchronous access parameters among cluster nodes, and determines whether the structure of the file system needs to be checked by reading the values of the parameters, thereby realizing the purpose of accelerating the migration speed of the file system among the cluster nodes of a storage system while ensuring the data security.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the embodiments or technical solutions of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a flowchart illustrating a method for migrating a file system according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a cluster node service shutdown process according to the present invention;
FIG. 3 is a schematic flow chart of a cluster node service startup process according to the present invention;
FIG. 4 is a block diagram of an embodiment of an apparatus for migrating a file system according to the present invention;
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The steps illustrated in the flow charts of the figures may be performed in a computer system such as a set of computer-executable instructions. Also, while a logical order is shown in the flow diagrams, in some cases, the steps shown or described may be performed in an order different than here.
As shown in fig. 1, fig. 1 is a schematic flowchart of an embodiment of a method for migrating a file system according to the present invention, where the method includes the following steps:
step S101, setting synchronous access parameters among cluster nodes, wherein the synchronous access parameters are used for marking the state of service safety stop;
the cluster nodes include one or more nodes, and a synchronous access parameter A is defined in the cluster file system resource, and the parameter A can be accessed differently among the nodes of the cluster. The parameter a is defined as true when only the service is safely stopped at one node and not started at other nodes, otherwise false or no parameter exists.
Step S102, when the file system is migrated between the cluster nodes, reading the value of the synchronous access parameter;
step S103, determining whether the file system structure needs to be checked according to the read value.
If the read value is true, skipping checking the file system structure;
if the read value is false or null, checking the file system structure.
When the original node service is normally closed (including shutdown, upgrade, cluster negotiation, manual migration, etc.), the closing process is controllable. In addition to file system resources, the nodes of a general storage system also include resources such as upper-layer shared resources, specific services, and the like, and lower-layer memories, and the like.
Firstly, the closing process is ensured to be closed step by step from top to bottom. The method comprises the steps of stopping upper layer business at first, submitting caching and unloading a file system after the upper layer business is completely stopped, and disconnecting the file system from a memory after the file system is safely unloaded. Therefore, the service data is safely stored, and the original node sets the synchronous access parameter A between the cluster nodes to true.
And if the upper-layer service cannot be safely stopped after waiting overtime, the fault is considered to occur, and the parameter A is not set to true. Fig. 2 shows a flow of normal shutdown of the original node service.
As shown in fig. 2, fig. 2 is a schematic flow chart of a cluster node service shutdown process in the present invention, which includes:
s201: the node stops the upper layer service;
s202: closing the upper layer service;
s203: judging whether the upper layer service is closed, if so, executing S204, otherwise, returning to S203 until overtime, and turning to the step S208;
s204: unloading the file system;
s205: judging whether the file system is closed, if so, executing S206, otherwise, returning to S205 until overtime, and turning to the step S208;
s206: disconnecting the memory;
s207: setting the parameter A to true;
s208: and (5) stopping abnormally, and setting the parameter A to false or null value.
The node-initiated file system service comprises an initial initiation service and a migration service from other nodes.
If the other nodes are safely migrated, the state of the parameter A of synchronous access can be read as true at the time of starting. The state of parameter a is first cleared or set to false and then an attempt is made to connect to memory and mount the file system. If the file system is successfully closed at the original node, the file system is not required to be checked and can be directly used, otherwise, the file system is checked.
If the node is started for the first time or migrated due to other node exception, the synchronous access parameter A will not be read as true. At this point, not only is an attempt made to connect to memory, mount the file system, but also the file system structure needs to be checked. Fig. 3 shows a flow of the new node handling service initiation.
As shown in fig. 3, fig. 3 is a schematic flow chart of a cluster node service startup process of the present invention, which includes:
s301: the node starts the business;
s302: reading a synchronous access parameter A;
s303: judging whether the value of the parameter A is true, if so, executing S304, otherwise, executing S310;
s304: clearing the state of the parameter A or setting the parameter A to false;
s305: connecting a memory;
s306: mounting a file system;
s307: judging whether the mounting is successful, if so, executing S308, otherwise, executing S309;
s308: starting normally;
s309: repairing;
s310: connecting a memory;
s311: mounting a file system;
s312: checking a file system;
s313: judging whether the check is normal or not, if so, executing S308, otherwise, executing S309;
the present invention further provides a device for migrating a file system, as shown in fig. 4, fig. 4 is a block diagram of a structure of an embodiment of the device for migrating a file system according to the present invention, including:
a setting module 401, configured to set a synchronous access parameter between cluster nodes, where the synchronous access parameter is used to identify a state where a service is safely stopped;
a reading module 402, configured to read a value of the synchronous access parameter when a file system is migrated between cluster nodes;
a checking module 403, determining whether the file system structure needs to be checked according to the reading result;
if the read value is true, skipping to check the file system structure;
if the read value is false or null, checking the file system structure.
For details of the device embodiment, reference may be made to specific steps of the method embodiment, which are not described herein again.
Embodiments of the present invention further provide a computer-readable storage medium, which stores computer program instructions, where the instructions are executed by a processor to implement any one of the above methods for migrating a file system.
In summary, embodiments of the present invention provide a method for safely and quickly migrating a file system, in which a synchronous access parameter between cluster nodes is set, and a value of the parameter is read to determine whether a file system structure needs to be checked, so that data security is ensured, and migration speed of the file system between cluster nodes of a storage system is increased.
In the description of the present specification, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, and the program may be stored in a computer readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a separate product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (7)
1. A method for migrating a file system among cluster nodes, the method comprising:
setting synchronous access parameters among cluster nodes, wherein the synchronous access parameters are used for identifying the state of service safety stop, and the cluster nodes comprise one or more nodes;
reading the value of the synchronous access parameter when the file system is migrated between the cluster nodes;
determining whether a file system structure needs to be checked according to the read value;
if the read value is true, skipping checking the file system structure;
if the read value is false or null, checking the file system structure;
setting the synchronous access parameter as true when the original node service is closed safely; setting the synchronous access parameter as false or null value when the original node service is not safely closed;
and the original node is one of the cluster nodes.
2. The method of claim 1, further comprising:
the original node stops the upper layer service, submits the caching and unloading file system after the upper layer service is completely stopped, disconnects the connection with the memory after the file system is safely unloaded, and sets the synchronous access parameter as true;
if the upper layer service is overtime or the file system is not safely uninstalled, the fault is considered to occur, the original node service is not safely closed, and the synchronous access parameter is set to false or a null value.
3. The method according to claim 1 or 2, characterized in that the method further comprises:
when a new node starts a service, connecting a memory, and reading the synchronous access parameter, wherein the new node is one of the cluster nodes;
if the synchronous access parameter value is true, clearing or setting the synchronous access parameter value to false, mounting the file system, skipping checking the structure of the file system after successful mounting, and normally starting the service by the new node, and if the mounting is unsuccessful, repairing;
if the synchronous access parameter value is not true, mounting a file system and checking a file system structure; when the file system is normal, the new node starts the service normally, otherwise, the repair is carried out.
4. An apparatus for migrating a file system among cluster nodes, the apparatus comprising:
the system comprises a setting module, a sending module and a processing module, wherein the setting module is used for setting synchronous access parameters among cluster nodes, the synchronous access parameters are used for identifying the state of service safety stop, and the cluster nodes comprise one or more nodes;
the reading module is used for reading the value of the synchronous access parameter when the file system is migrated among the cluster nodes;
the checking module is used for determining whether the file system structure needs to be checked according to the read value;
if the read value is true, skipping to check the file system structure;
if the read value is false or null, checking the file system structure;
the setup module is further to:
setting the synchronous access parameter as true when the original node service is closed safely; setting the synchronous access parameter as false or null value when the original node service is not safely closed;
and the original node is one of the cluster nodes.
5. The apparatus of claim 4, wherein the setup module is further configured to:
the original node stops the upper layer service, submits the caching and unloading file system after the upper layer service is completely stopped, disconnects the connection with the memory after the file system is safely unloaded, and sets the synchronous access parameter as true;
and if the upper-layer service is overtime or the file system is not safely unloaded, the fault is considered to occur, the original node service is not safely closed, and the synchronous access parameter is set to false or a null value.
6. The apparatus of claim 4 or 5, wherein the inspection module is further configured to:
when a new node starts a service, connecting a memory, and reading the synchronous access parameter, wherein the new node is one of the cluster nodes;
if the synchronous access parameter value is true, clearing or setting the synchronous access parameter value to false, mounting the file system, skipping checking the structure of the file system after successful mounting, and normally starting the service by the new node, and if the mounting is unsuccessful, repairing;
if the synchronous access parameter value is not true, mounting a file system and checking a file system structure; when the file system is normal, the new node starts the service normally, otherwise, the repair is carried out.
7. A computer-readable storage medium storing computer program instructions for execution by a processor to implement the method of any one of claims 1-3.
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