CN109445701B - Automatic simplifying configuration synchronization method for double-control disk array - Google Patents
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0602—Interfaces specially adapted for storage systems specifically adapted to achieve a particular effect
- G06F3/0614—Improving the reliability of storage systems
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
- G06F11/16—Error detection or correction of the data by redundancy in hardware
- G06F11/20—Error detection or correction of the data by redundancy in hardware using active fault-masking, e.g. by switching out faulty elements or by switching in spare elements
- G06F11/2053—Error detection or correction of the data by redundancy in hardware using active fault-masking, e.g. by switching out faulty elements or by switching in spare elements where persistent mass storage functionality or persistent mass storage control functionality is redundant
- G06F11/2056—Error detection or correction of the data by redundancy in hardware using active fault-masking, e.g. by switching out faulty elements or by switching in spare elements where persistent mass storage functionality or persistent mass storage control functionality is redundant by mirroring
- G06F11/2071—Error detection or correction of the data by redundancy in hardware using active fault-masking, e.g. by switching out faulty elements or by switching in spare elements where persistent mass storage functionality or persistent mass storage control functionality is redundant by mirroring using a plurality of controllers
- G06F11/2076—Synchronous techniques
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0628—Interfaces specially adapted for storage systems making use of a particular technique
- G06F3/0655—Vertical data movement, i.e. input-output transfer; data movement between one or more hosts and one or more storage devices
- G06F3/0658—Controller construction arrangements
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0668—Interfaces specially adapted for storage systems adopting a particular infrastructure
- G06F3/0671—In-line storage system
- G06F3/0683—Plurality of storage devices
- G06F3/0689—Disk arrays, e.g. RAID, JBOD
Abstract
The invention relates to a method for synchronizing the thin provisioning of a double-control disk array, which comprises the following steps: the pretreatment process comprises the following steps: the kernel loads a target driver of the automatic IO control equipment module; defining a mapping relation between bottom block equipment and automatic IO control equipment in a user mode; the kernel creates a target device according to the transmitted parameters and records the IO control information in the IO control attribute; creating a mapping table; creating dm device, recording the device type in a dm device metadata area, and generating automatic IO control equipment; creating a simplified resource allocation volume on the automatic IO control equipment; and IO processing procedures. The invention discloses an automatic simplified configuration synchronization method of a double-control disk array, which realizes the data synchronization of a simplified resource allocation volume on the double-controller disk array and ensures that the simplified resource allocation volume realizes fault switching.
Description
Technical Field
The invention relates to the technical field of computer information storage, in particular to a method for synchronizing the thin provisioning of a double-control disk array.
Background
With the explosive growth of information and the popularization of information systems, the size and capacity of storage systems have been expanding year by year. To ensure that the storage capacity can meet current and even future business demands, users typically deploy greater physical storage space than actually needed — a "safety perspective". But in the actual use process of users, the deployment capacity of the users is not fully utilized. Industry research organizations have found that in some projects, the actual usage capacity is only 20% -30% of the deployed capacity. Thus, "thin provisioning" technology has emerged in return for achieving higher storage capacity utilization and greater return on investment. Thin provisioning, sometimes referred to as "over-provisioning", is a technique for reducing physical storage deployment by using virtualization, which does not partition too much space to an application once, but allocates a small amount of space to an application program many times according to the capacity actually required by the application, and when the data generated by the application grows and the allocated capacity space is insufficient, the system allocates a part of storage space from the back-end storage pool again.
With thin provisioning, all user capacity is allocated as virtual storage, while actual physical disk space is allocated according to actual usage. All physical disks are regarded as a disk pool for management, and allocation is completed according to the data volume written into the virtual volume. As a result, unused physical disk capacity is significantly reduced, thereby enabling more efficient storage operations.
On the basis of a traditional single-controller storage system, the development of the thin provisioning technology is relatively mature, but with the continuous improvement of the stability of the storage system, the double-controller storage device replaces the single-controller storage device with a single point of failure, the storage function of the double-controller storage device gradually migrates to the double-controller storage device, common storage solutions such as NAS, SAN and the like are successfully applied to the double-controller storage system, and some advanced functions including the thin provisioning are not mature due to the large technical difficulty. The difficulty of thin provisioning of dual-controller storage devices is that the thin provisioning metadata of two controllers are different and the update frequency is very high, so that it is difficult to ensure the thin provisioning data synchronization of two controllers.
Disclosure of Invention
The invention discloses an automatic simplified configuration synchronization method of a double-control disk array, which realizes the data synchronization of a simplified resource allocation volume on the double-controller disk array and ensures that the simplified resource allocation volume realizes fault switching.
The invention discloses a method for synchronizing the thin provisioning of a double-control disk array, which comprises the following steps: the double-control disk array comprises a main controller, a controller and a shared storage unit; a heartbeat link is arranged between the main controller and the controller, and the main controller and the controller are provided with a shared data link with the shared storage unit; the storage logic architecture comprises: the system comprises bottom layer block equipment, automatic IO control equipment and a simplified resource allocation volume of a shared storage unit; the automatic IO control equipment is bottom layer block equipment mapped based on a device mapper mechanism; the pretreatment process comprises the following steps: the kernel loads a target driver of the automatic IO control equipment module; defining a mapping relation between bottom block equipment and automatic IO control equipment in a user mode; the kernel creates a target device according to the transmitted parameters and records the IO control information in the IO control attribute; creating a mapping table; creating dm device, recording the device type in a dm device metadata area, and generating automatic IO control equipment; creating a simplified resource allocation volume on the automatic IO control equipment; IO processing: when user data arrives, an IO request is sent to the simplified resource allocation volume, and the simplified resource allocation volume forwards the data to the automatic IO control equipment; after receiving the IO request, the automatic IO control equipment is processed by a target driver of the automatic IO control equipment, the IO request is issued to the target device by dm device according to the mapping relation of mapping table, and corresponding IO operation is executed according to the IO control attribute; for the read operation, the target device will continue to execute the IO operation, address on the bottom device of the shared memory unit, and read the data; for write operation, the main controller end continues to execute IO operation, addresses on the bottom layer block device, writes data and returns an operation result, and for the controller end, returns an operation result which is successfully written; and returning the IO operation result layer by layer.
According to an embodiment of the thin provisioning synchronization method for a dual-control disk array of the present invention, the bottom layer block device is a single disk/electronic disk sharing a storage unit, or a RAID virtual block device composed of a plurality of disks/electronic disks, and the bottom layer block device is a storage space provider of user data.
According to an embodiment of the thin provisioning synchronization method for the dual-control disk array, the automatic IO control device is designed with an automatic IO control device target driver in a kernel state based on a device mapper mechanism, and a user state defines specific strategies and control logics of the automatic IO control device.
According to an embodiment of the thin provisioning synchronization method for a dual-control disk array of the present invention, a thin resource deployment volume is a logical storage device provided for upper layer services, and is composed of a thin provisioning metadata area and a plurality of thin provisioning data areas.
According to an embodiment of the thin provisioning synchronization method for the dual-control disk array, an automatic IO control device is registered in a kernel by an automatic IO control device target driver, and the automatic IO control device includes three parts: dm device, mapping table and target device; the dm device is a logical abstraction, and the kernel provides a logical device externally, and is used for creating a thin provisioning resource volume, and establishing mapping through a mapping relationship described by a mapping table and a target device.
According to an embodiment of the thin provisioning synchronization method for the dual-control disk array, the dm device consists of a dm device metadata area and a dm device data area, and the dm device metadata area records map information and target device information so as to assist a system to query information and a state of the device.
According to an embodiment of the thin provisioning synchronization method for the dual-control disk array, a mapping table of the automatic IO control device is a mapping table from dm device to target device, a logical address and a range of the dm device, an address offset of a physical device where the target device is located, a target type and the like are defined, and an un-offset part of the target device address is used for recording attributes of the automatic IO control device.
According to an embodiment of the thin provisioning synchronization method for the dual-control disk array, an address mapping relationship of the mapping table is as follows: the dm device storage address is equal to the size of the dm device metadata area + the target device12 storage address; the target device represents a physical space segment and an IO control attribute mapped by the dm device, and a physical space of the target device physical space bottom block device; the IO control attribute is used for controlling the specific IO operation process and is defined by the role of the controller, the switch is opened at the main controller end, and the switch is closed at the controller end; the dm device data area corresponds to a storage address of the bottom block device through an address mapping mechanism, when the IO control attribute is on, the device layer issues the received write request, and when the IO control attribute is off, the device layer directly discards the write request data and directly returns success.
According to an embodiment of the thin provisioning synchronization method for dual-controlled disk arrays of the present invention, the automatic IO control device defines rules for device creation, deletion, and import in a user mode, and integrates the rules into the dmsetup tool.
According to an embodiment of the thin provisioning synchronization method for the dual-control disk array, the mapping relationship between the bottom block device and the automatic IO control device is defined in the user mode to include a bottom device path, an address mapping relationship, an automatic IO control device name, an automatic IO control device type, and IO control configuration information, and a command is executed using a dmsetup tool.
The invention discloses an automatic simplified configuration synchronization method of a double-control disk array, which realizes the data synchronization of a simplified resource allocation volume on the double-controller disk array and ensures that the simplified resource allocation volume realizes fault switching.
Drawings
FIG. 1 is a diagram of a hardware architecture of the thin provisioning synchronization method for a dual-control disk array according to the present invention;
FIG. 2 is a diagram of the storage logic architecture of the thin provisioning synchronization method for a dual-control disk array according to the present invention;
FIG. 3 is a schematic diagram of an automatic IO control device of the thin provisioning synchronization method of the dual-control disk array according to the present invention;
wherein, the reference numbers:
1 controller (Main controller) 2 controller (controller)
3-heartbeat link 4 shared data link
5 shared storage unit 6 magnetic/electronic disk device
7 automatic IO control device of bottom layer block device 8
9 thin resource deployment volume 10 thin provisioning metadata region
11 thin provisioning data area 12target device
13IO control Attribute 14dm device
15dm device metadata area 16dm device data area
17mapping table
Detailed Description
In order to make the objects, contents, and advantages of the present invention clearer, the following detailed description of the embodiments of the present invention will be made in conjunction with the accompanying drawings and examples.
Fig. 1 is a schematic diagram of a dual-control disk array, and as shown in fig. 1, a hardware platform required by the present invention is the dual-control disk array, and the dual-control disk array is composed of two controllers and a shared storage unit, and as shown in fig. 1, the dual-control disk array includes a controller (main controller) 1, a controller (sub controller) 2, a heartbeat link 3, a shared data link 4, and a shared storage unit 5. Wherein the shared storage unit comprises a number of disk/electronic disc devices 6. The platform ensures that two controllers of the double-control disk array respectively define a main role and a standby role, the shared storage unit ensures that available storage equipment is provided for thin provisioning, and the system regularly refreshes thin provisioning deployment volumes.
Fig. 2 is a storage logic architecture diagram of the thin provisioning synchronization method for the dual-control disk array of the present invention, and as shown in fig. 2, the storage logic architecture diagram of the thin provisioning synchronization design of the present invention is, from bottom to top: the system comprises three layers of bottom layer block equipment 7, automatic IO control equipment 8 and a simplified resource allocation volume 9, wherein the block equipment can be a single disk/electronic disk of a shared storage unit 5 or virtual block equipment such as RAID (redundant array of independent disks) formed by a plurality of disks/electronic disks, and the block equipment is a final storage space provider of user data. The automatic IO control device 8 is a block device mapped based on a device mapper mechanism, and its core idea is to determine the specific operation of IO by the role of the controller. The thin resource deployment volume 9 is a logical storage device provided for upper layer services, and the device is composed of a thin provisioning metadata area 10 and a plurality of thin provisioning data areas 11, and can play a role of thin resource deployment, improve the utilization rate of a storage system, and save cost. The views of the three-tier device described above on both controllers are identical. In the three-layer storage logic architecture, the automatic IO control device 8 is realized based on a device mapper mechanism, a target driver of the automatic IO control device is designed in a kernel state, and a user state defines a specific strategy and control logic of the automatic IO control device.
Fig. 3 is a schematic diagram of an automatic IO control device of the thin provisioning synchronization method for a dual-controlled disk array according to the present invention, and as shown in fig. 3, an automatic IO control device target driver registers an automatic IO control device 8 in a kernel, which includes three main parts: dm device 14, mapping table 17, target device 12. dm device 14 is a logical abstraction, which is a logical device provided by the kernel externally, and the thin provisioning resource volume is created on the device, and it establishes mapping through the mapping relationship described by mapping table 17 and target device 12. Structurally, the dm device 14 is composed of a dm device metadata area 15 and a dm device metadata area 16, and the dm device metadata area 15 records map information, target device12 information, and the like, so as to assist the system to query the information and state of the device. The mapping table 17 of the automatic IO control device is a mapping table from the dm device 14 to the target device12, and defines a logical address and a range of the dm device 14, an address offset of a physical device where the target device12 is located, a target type, and the like, where a part of the address of the target device12, which is not offset, is used for recording attributes of the automatic IO control device, and the attributes ensure that the mapping relationship is not lost due to shutdown, restart, and the like. The address mapping relationship of the mapping table 17 is that the storage address of the dm device 14 is equal to the size of the dm device metadata area 15 + the storage address of the target device 12. target device12 represents the physical space segment mapped by dm device 14 and IO control attributes 13, and its physical space is the physical space of the underlying block device 8. The IO control attribute 13 is used to control the specific IO operation process, and is defined by a controller role, where the main controller turns on the switch, and the controller turns off the switch. The dm device data area 16 corresponds to the storage address of the bottom layer block device 6 through an address mapping mechanism, when the IO control attribute is on, the device layer issues the received write request, and when the IO control attribute is off, the device layer directly discards the write request data and directly returns a success.
The automatic IO control equipment 8 defines rules of equipment creation, deletion and import in a user mode, and integrates the rules into the dmsetup tool, so that the system interface is unified. And the user state defines the actual equipment, the mapping relation, the control attribute and the like of the target device, the parameters are transmitted to the kernel, and the kernel finishes the registration, the logout, the IO operation and the like of the equipment.
The invention realizes the automatic thin configuration synchronization function by a software method, and the software is deployed on the controller 1 and the controller 2. The method includes the following steps that the synchronization process of the read-write operation of the simplified configuration deployment volume is divided into a preprocessing process and an IO processing process:
the pretreatment process comprises the following steps:
the kernel loads an automatic IO control equipment module target driver;
defining the mapping relation between the bottom block device 6 and the automatic IO control device 8 in a user mode, wherein the mapping relation comprises a bottom device path, an address mapping relation, an automatic IO control device name, an automatic IO control device type, IO control configuration information and the like, and executing a command by using a dmsetup tool;
the kernel creates a target device12 according to the transmitted parameters, and records the IO control information in an IO control attribute 13; creating a mapping table 17; creating dm device 14, recording the device type, namely, magic information and the like in a dm device metadata area 15, and generating automatic IO control equipment 8;
a thin resource deployment volume 9 is created on the automated IO control device 8.
IO processing:
when user data arrives, an IO request is sent to the streamlined resource allocation volume 9, and the streamlined resource allocation volume 9 forwards the data to the automatic IO control equipment 8;
after receiving the IO request, the automatic IO control device 8 is processed by the automatic IO control device target driver, issues the IO request to the target device12 from the dm device 14 according to the mapping relation of the mapping table 17, and executes the corresponding IO operation according to the IO control attribute 13;
for a read operation, the target device12 will continue to perform IO operations, address on the underlying device 6, and read data;
for write operation, the main controller 1 will continue to execute IO operation, address on the bottom layer block device 6, write data, and return an operation result. For the controller end 2, specific IO operations are ignored, and a successfully written operation result is directly returned;
and returning the IO operation result layer by layer.
In the thin provisioning synchronization method of the double-control disk array, the automatic IO controls the data IO operation of the equipment, and according to the application requirement of the thin provisioning of the double-control disk array, the read-write rule of the storage space for the thin provisioning is defined as follows: 1. the read operation of the two controllers is shared, the read operation of one controller is shared with the write operation of the other controller, and the simultaneous write operation of the two controllers is mutually exclusive. The important point of meeting the above definition is to make an operation scheme for writing by two controllers simultaneously. When the automatic IO control equipment needs to write, firstly reading the configuration file, determining whether the writing is allowed or not, if so, storing the data into the data area through address mapping, and updating the metadata, namely executing real writing operation, and if not, directly discarding the received IO packet, not performing any IO operation on the equipment, directly returning and successfully writing back, namely the writing operation is a false writing operation. For the upper layer interface, it cannot know whether the bottom layer device really executes data storage, and in any case, it receives write success and cannot detect any exception. This has the advantage that for a dual-control disk array, the thin provisioning volumes will have the same instructions and data from both controllers, and as long as it is ensured that correct IO operations are performed at one end, the results that both controllers expect are obtained, so that correct results are obtained for either the end that actually performs the write operation or the end that performs the dummy write operation.
The method for automatically simplifying configuration synchronization of the double-control disk array realizes data synchronization of the simplified resource allocation volume on the double-controller disk array, and ensures that the simplified resource allocation volume realizes fault switching.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A method for synchronizing thin provisioning of a dual-control disk array is characterized by comprising the following steps:
the double-control disk array comprises a main controller, a controller and a shared storage unit; a heartbeat link is arranged between the main controller and the controller, and the main controller and the controller are provided with a shared data link with the shared storage unit; the storage logic architecture comprises: the system comprises bottom layer block equipment, automatic IO control equipment and a simplified resource allocation volume of a shared storage unit; the automatic IO control equipment is bottom layer block equipment mapped based on a device mapper mechanism;
the pretreatment process comprises the following steps:
the kernel loads a target driver of the automatic IO control equipment module;
defining a mapping relation between bottom block equipment and automatic IO control equipment in a user mode;
the kernel creates a target device according to the transmitted parameters and records the IO control information in the IO control attribute; creating a mapping table; creating dm device, recording the device type in a dm device metadata area, and generating automatic IO control equipment;
creating a simplified resource allocation volume on the automatic IO control equipment;
IO processing:
when user data arrives, an IO request is sent to the simplified resource allocation volume, and the simplified resource allocation volume forwards the data to the automatic IO control equipment;
after receiving the IO request, the automatic IO control equipment is processed by a target driver of the automatic IO control equipment, the IO request is issued to the target device by dm device according to the mapping relation of mapping table, and corresponding IO operation is executed according to the IO control attribute;
for the read operation, the target device will continue to execute the IO operation, address on the bottom device of the shared memory unit, and read the data;
for write operation, the main controller end continues to execute IO operation, addresses on the bottom layer block device, writes data and returns an operation result, and for the controller end, returns an operation result which is successfully written;
and returning the IO operation result layer by layer.
2. The thin provisioning synchronization method of a dual-controlled disk array as claimed in claim 1, wherein the bottom layer block device is a single disk/electronic disk sharing a storage unit, or a RAID virtual block device consisting of a plurality of disks/electronic disks, and the bottom layer block device is a storage space provider of user data.
3. The thin provisioning synchronization method for dual-controlled disk arrays according to claim 1, wherein the automatic IO control device is designed with a target driver in a kernel mode based on a device mapper mechanism, and a user mode defines specific policies and control logics of the automatic IO control device.
4. The method of claim 1, wherein the thin resource provisioning volume is a logical storage device provided to upper services and is comprised of a thin provisioning metadata area and a plurality of thin provisioning data areas.
5. The thin provisioning synchronization method for dual-controlled disk arrays according to claim 1, wherein the target driver of the automatic IO control device registers an automatic IO control device in the kernel, and the automatic IO control device comprises three parts: dm device, mapping table and target device; the dm device is a logical abstraction, and the kernel provides a logical device externally, and is used for creating a thin provisioning resource volume, and establishing mapping through a mapping relationship described by a mapping table and a target device.
6. The method for thin provisioning synchronization of a dual-managed disk array as claimed in claim 5, wherein the dm device is composed of a dm device metadata area and a dm device data area, and the dm device metadata area records map information and target device information to assist the system to query the information and status of the device.
7. The thin provisioning synchronization method for dual-controlled disk arrays according to claim 5, wherein the mapping table of the automatic IO control device is a mapping table from dm device to target device, and the mapping table defines a logical address and a range of the dm device, an address offset of a physical device where the target device is located, a target type, and the like, and an un-offset part of the target device address is used for recording attributes of the automatic IO control device.
8. The thin provisioning synchronization method for dual-controlled disk arrays according to claim 5, wherein the mapping table has an address mapping relationship of: the dm device storage address is equal to the size of the dm device metadata area + the target device12 storage address; the target device represents a physical space segment and an IO control attribute mapped by the dm device, and a physical space of the target device physical space bottom block device; the IO control attribute is used for controlling the specific IO operation process and is defined by the role of the controller, the switch is opened at the main controller end, and the switch is closed at the controller end; the dm device data area corresponds to a storage address of the bottom block device through an address mapping mechanism, when the IO control attribute is on, the device layer issues the received write request, and when the IO control attribute is off, the device layer directly discards the write request data and directly returns success.
9. The method for thin provisioning synchronization of dual-managed disk arrays according to claim 1, wherein the automatic IO control device defines rules for device creation, deletion, and import in user mode and integrates the rules into the dmsetup tool.
10. The method of claim 1, wherein the mapping relationships between the underlying block devices and the automatic IO control devices are defined in a user mode to include underlying device paths, address mapping relationships, automatic IO control device names, automatic IO control device types, and IO control configuration information, and commands are executed using a dmsetup tool.
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