CN109491611B - Metadata dropping method, device and equipment - Google Patents
Metadata dropping method, device and equipment Download PDFInfo
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- CN109491611B CN109491611B CN201811319311.9A CN201811319311A CN109491611B CN 109491611 B CN109491611 B CN 109491611B CN 201811319311 A CN201811319311 A CN 201811319311A CN 109491611 B CN109491611 B CN 109491611B
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- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000004590 computer program Methods 0.000 claims description 10
- 239000000725 suspension Substances 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 4
- 230000001680 brushing effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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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
- G06F3/061—Improving I/O performance
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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
- G06F3/0638—Organizing or formatting or addressing of data
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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
- G06F3/0673—Single storage device
- G06F3/0674—Disk device
- G06F3/0676—Magnetic disk device
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Abstract
The invention discloses a metadata disk-dropping method, which comprises the steps of reading the used memory value of a main memory pool; judging whether the main memory pool has insufficient memory according to the used memory value; if the main memory pool is insufficient, starting a standby memory pool to perform metadata destaging by using the main memory pool and the standby memory pool; and starting a timer, and when the timing duration of the timer reaches a timing threshold, sending an IO request reply to the host. The metadata disk-dropping method can effectively reduce the situations that the metadata disk-dropping speed is slow and the IO request of the host cannot be replied in time due to the lack of the memory of the storage system; IO suspension is avoided, and reliability of metadata disk dropping is improved. The invention also discloses a metadata tray dropping device, equipment and a computer readable storage medium, which have the beneficial effects.
Description
Technical Field
The invention relates to the technical field of data storage, in particular to a metadata disk-dropping method; and also relates to a metadata landing device, equipment and a computer readable storage medium.
Background
When the host issues an IO request, the storage system stores the metadata into the memory in a data structure of the B + tree. When the data amount in the memory reaches the lower brushing threshold value, the metadata in the memory can be brushed down onto the disk, namely the metadata is landed. If the metadata exists on the disk, the metadata in the memory is merged with the metadata on the disk, and then data is flushed down. Under normal conditions, the metadata falling can merge the memory tree and the disk tree, and under the conditions that the disk tree is particularly large or a storage system generates a large amount of metadata rapidly, an IO request of a host cannot be replied in time due to the fact that the speed of the metadata falling is low, the host stops issuing IO, and therefore IO cutoff is caused, and even the storage system crashes overtime.
Therefore, how to provide a metadata disk-dropping scheme to avoid IO suspension and improve the reliability of metadata disk-dropping is a technical problem to be urgently solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide a metadata disk-dropping method, which can avoid IO suspension and improve the reliability of metadata disk-dropping; another object of the present invention is to provide a metadata landing device, an apparatus and a computer readable storage medium, all of which have the above advantages.
In order to solve the technical problem, the invention provides a metadata disk-dropping method, which comprises the following steps:
reading a used memory value of the main memory pool;
judging whether the main memory pool has insufficient memory according to the used memory value;
if the main memory pool is insufficient, starting a standby memory pool to perform metadata destaging by using the main memory pool and the standby memory pool; and starting a timer, and when the timing duration of the timer reaches a timing threshold, sending an IO request reply to the host.
Optionally, the determining whether the main memory pool has insufficient memory according to the used memory value includes:
comparing the used memory value with a preset threshold value, and judging whether the used memory value reaches the preset threshold value; wherein the preset threshold is smaller than the memory capacity of the main memory pool;
if so, the main memory pool is insufficient in memory;
and if not, the main memory pool is full.
Optionally, the method further includes:
modifying the size of the timing threshold according to configuration input.
In order to solve the above technical problem, the present invention further provides a metadata tray dropping apparatus, including:
the reading module is used for reading the used memory value of the main memory pool;
the judging module is used for judging whether the main memory pool has insufficient memory according to the used memory value;
the starting module is used for starting a standby memory pool if the main memory pool is insufficient to perform metadata disk dropping by using the main memory pool and the standby memory pool; and starting a timer, and when the timing duration of the timer reaches a timing threshold, sending an IO request reply to the host.
Optionally, the determining module is specifically configured to:
comparing the used memory value with a preset threshold value, and judging whether the used memory value reaches the preset threshold value; wherein the preset threshold is smaller than the memory capacity of the main memory pool;
if so, the main memory pool is insufficient in memory;
and if not, the main memory pool is full.
Optionally, the method further includes:
and the modifying module is used for modifying the size of the timing threshold according to configuration input.
In order to solve the above technical problem, the present invention further provides a metadata destaging device, including:
a memory for storing a computer program;
a processor for implementing the steps of the metadata landing method as claimed in any one of the above when executing the computer program.
In order to solve the above technical problem, the present invention further provides a computer-readable storage medium, which stores a computer program, and the computer program, when executed by a processor, implements the steps of the metadata landing method according to any one of the above.
The metadata disk-dropping method provided by the invention comprises the steps of reading the used memory value of a main memory pool; judging whether the main memory pool has insufficient memory according to the used memory value; if the main memory pool is insufficient, starting a standby memory pool to perform metadata destaging by using the main memory pool and the standby memory pool; and starting a timer, and when the timing duration of the timer reaches a timing threshold, sending an IO request reply to the host.
Therefore, the metadata disk-dropping method provided by the invention is characterized in that the spare memory pool is additionally arranged on the basis of the main memory pool, and the storage system judges whether the main memory pool has insufficient memory by reading the used memory value of the main memory pool. When the main memory pool has insufficient memory, the standby memory pool is started, and then the main memory pool and the standby memory pool are utilized to perform metadata dropping, so that the situations that the metadata dropping speed is low and the IO request of the host cannot be replied in time due to the insufficient memory of the main memory pool at the current moment can be effectively reduced; in addition, when the memory of the main memory pool is insufficient, the timer is started, and when the timing duration of the timer reaches a timing threshold, an IO request reply is sent to the host, so that negative feedback is realized, the speed of issuing the IO request by the host is reduced, the IO request is prevented from being hung, and the reliability of metadata disk dropping is improved.
The metadata dropping device, the equipment and the computer readable storage medium provided by the invention have the beneficial effects.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed in the prior art and the embodiments 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 to obtain other drawings without creative efforts.
Fig. 1 is a schematic flowchart of a metadata destaging method according to an embodiment of the present invention;
FIG. 2 is a diagram illustrating a metadata dropping apparatus according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a metadata landing device according to an embodiment of the present invention.
Detailed Description
The core of the invention is to provide a metadata disk-dropping method, which can avoid IO suspension and improve the reliability of metadata disk-dropping; another core of the present invention is to provide a metadata landing device, an apparatus and a computer readable storage medium, all having the above beneficial effects.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic flowchart illustrating a metadata destaging method according to an embodiment of the present invention; referring to fig. 1, the metadata landing method includes:
s100: reading a used memory value of the main memory pool;
s200: judging whether the main memory pool has insufficient memory according to the used memory value;
specifically, a standby memory pool is added on the basis of a main memory pool of the storage system. The storage system can read the used memory value of the main memory pool from the relevant interface of the main memory pool in real time, and further judge whether the main memory pool has insufficient memory according to the read used memory value of the main memory pool.
Optionally, the determining whether the main memory pool has insufficient memory according to the used memory value may include: comparing the used memory value with a preset threshold value, and judging whether the used memory value reaches the preset threshold value; wherein the preset threshold is smaller than the memory capacity of the main memory pool; if so, the main memory pool is insufficient in memory; if not, the main memory pool is full.
Specifically, a suitable memory reference value, that is, the preset threshold value, may be preset. The storage system further compares the used memory value with a preset threshold value on the basis of reading the used memory value of the main memory pool, judges whether the used memory value reaches the preset threshold value, and if so, the main memory pool is insufficient in memory. On the contrary, if the current value is not reached, the main memory pool is full. In this embodiment, the preset threshold is smaller than the storage capacity of the main memory pool. Therefore, before the memory of the main memory pool is completely occupied, the standby memory pool can be started, and the reliability of metadata disk dropping is further improved. For example, the memory capacity of the main memory pool is 400M, the preset threshold is 350, and when the used memory value of the main memory pool reaches 350M and does not reach 400M, the spare memory pool is activated. Of course, the specific value of the preset threshold is not specifically limited in the present invention, and may be set differently according to actual needs.
S300: if the main memory pool is insufficient, starting a standby memory pool to perform metadata disk dropping by using the main memory pool and the standby memory pool; and starting a timer, and sending an IO request reply to the host when the timing duration of the timer reaches a timing threshold.
Specifically, if the main memory pool is insufficient, the standby memory pool is started, so that the metadata is landed through the main memory pool and the standby memory pool together. The metadata can be written into the main memory pool and the standby memory pool, and when the amount of the metadata in the main memory pool and the standby memory pool reaches the lower brushing threshold value, the metadata in the main memory pool and the standby memory pool are brushed down to the disk. In addition, when the memory shortage of the main memory pool is judged, the storage system starts a timer, and when the timing duration of the timer reaches a timing threshold, for example, reaches 30s, an IO request reply is sent to the host. And when the timing duration of the timer does not reach the timing threshold, no IO request reply is sent to the host.
On the contrary, if the main memory pool has sufficient memory, the processing speed of the things can be not limited at all, and the IO request of the receiving host can be processed normally.
Further, when the main memory pool and the standby memory pool complete metadata disk dropping, and after the memory is released, the main memory pool has sufficient memory space again, at this time, the storage system can close the standby memory pool and the timer, and the subsequent IO request is normally processed by the main memory pool until the main memory pool has insufficient memory again.
The invention also does not only limit the specific number of the spare memory pools additionally arranged in the storage system, and can set a proper number of spare memory pools in combination with the actual application requirements.
In summary, the metadata destaging method provided by the present invention adds the spare memory pool on the basis of the main memory pool, and the storage system determines whether the main memory pool has insufficient memory by reading the used memory value of the main memory pool. When the main memory pool has insufficient memory, the standby memory pool is started, and then the main memory pool and the standby memory pool are utilized to perform metadata disk dropping, so that the situations that the metadata disk dropping speed is low and the IO request of the host cannot be timely replied due to the lack of the memory of the storage system can be effectively reduced; in addition, when the main memory pool has insufficient memory, a timer is started, and when the timing duration of the timer reaches a timing threshold, an IO request reply is sent to the host, so that negative feedback is realized, the speed of issuing the IO request by the host is reduced, the IO request is prevented from being hung, and the reliability of metadata disk dropping is improved.
On the basis of the above-described embodiment: optionally, the metadata disk-dropping method may further include: the timing threshold is modified in size based on configuration input.
Specifically, in order to provide more flexible use experience for the user, when the user needs to change the speed of the host sending the IO request in combination with the actual application requirements, the related configuration information may be input, so that the storage system automatically modifies the size of the timing threshold according to the configuration input, thereby satisfying the actual requirements.
The invention also provides a metadata tray dropping device, which can be correspondingly referred to with the metadata tray dropping method described above. Referring to fig. 2, fig. 2 is a schematic diagram of a metadata dropping device according to an embodiment of the present invention; as can be seen from fig. 2, the metadata dropping device may include:
a reading module 10, configured to read a used memory value of the main memory pool;
a judging module 20, configured to judge whether the main memory pool has insufficient memory according to the used memory value;
the starting module 30 is configured to start the standby memory pool if the main memory pool is insufficient, so as to perform metadata dropping by using the main memory pool and the standby memory pool; and starting a timer, and sending an IO request reply to the host when the timing duration of the timer reaches a timing threshold.
On the basis of the foregoing embodiment, optionally, the determining module 20 is specifically configured to:
comparing the used memory value with a preset threshold value, and judging whether the used memory value reaches the preset threshold value; wherein the preset threshold is smaller than the memory capacity of the main memory pool; if so, the main memory pool is insufficient in memory; if not, the main memory pool is full.
On the basis of the above embodiment, optionally, the method further includes:
and the modifying module is used for modifying the size of the timing threshold according to the configuration input.
The present invention further provides a metadata tray dropping apparatus, please refer to fig. 3, where fig. 3 is a schematic diagram of a metadata tray dropping apparatus according to an embodiment of the present invention; as can be seen from fig. 3, the metadata landing device may include a memory 1 and a processor 2. Wherein, the memory 1 is used for storing computer programs; a processor 2, configured to implement the following steps when executing the computer program:
reading a used memory value of the main memory pool; judging whether the main memory pool has insufficient memory according to the used memory value; if the main memory pool is insufficient, starting a standby memory pool to perform metadata disk dropping by using the main memory pool and the standby memory pool; and starting a timer, and sending an IO request reply to the host when the timing duration of the timer reaches a timing threshold.
For the introduction of the metadata drop device provided by the present invention, please refer to the above embodiment of the metadata drop method, which is not described herein again.
The present invention also provides a computer readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of:
reading a used memory value of the main memory pool; judging whether the main memory pool has insufficient memory according to the used memory value; if the main memory pool is insufficient, starting a standby memory pool to perform metadata disk dropping by using the main memory pool and the standby memory pool; and starting a timer, and sending an IO request reply to the host when the timing duration of the timer reaches a timing threshold.
The computer-readable storage medium may include: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
For the introduction of the computer-readable storage medium provided by the present invention, please refer to the above method embodiments, which are not described herein again.
The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device, the apparatus and the computer-readable storage medium disclosed by the embodiments correspond to the method disclosed by the embodiments, so that the description is simple, and the relevant points can be referred to the description of the method.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The metadata landing method, device, equipment and computer readable storage medium provided by the invention are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (8)
1. A metadata destaging method, comprising:
reading a used memory value of the main memory pool;
judging whether the main memory pool has insufficient memory according to the used memory value;
if the main memory pool is insufficient, starting a standby memory pool to perform metadata destaging by using the main memory pool and the standby memory pool; and starting a timer, and when the timing duration of the timer reaches a timing threshold, sending an IO request reply to the host.
2. The metadata destaging method according to claim 1, wherein the determining whether the main memory pool has insufficient memory according to the used memory value comprises:
comparing the used memory value with a preset threshold value, and judging whether the used memory value reaches the preset threshold value; wherein the preset threshold is smaller than the memory capacity of the main memory pool;
if so, the main memory pool is insufficient in memory;
and if not, the main memory pool is full.
3. The metadata destaging method according to claim 2, further comprising:
modifying the size of the timing threshold according to configuration input.
4. A metadata dropoff device, comprising:
the reading module is used for reading the used memory value of the main memory pool;
the judging module is used for judging whether the main memory pool has insufficient memory according to the used memory value;
the starting module is used for starting a standby memory pool if the main memory pool is insufficient to perform metadata disk dropping by using the main memory pool and the standby memory pool; and starting a timer, and when the timing duration of the timer reaches a timing threshold, sending an IO request reply to the host.
5. The metadata tray dropping device according to claim 4, wherein the determining module is specifically configured to:
comparing the used memory value with a preset threshold value, and judging whether the used memory value reaches the preset threshold value; wherein the preset threshold is smaller than the memory capacity of the main memory pool;
if so, the main memory pool is insufficient in memory;
and if not, the main memory pool is full.
6. The metadata landing device of claim 5, further comprising:
and the modifying module is used for modifying the size of the timing threshold according to configuration input.
7. A metadata dropoff device, comprising:
a memory for storing a computer program;
a processor for implementing the steps of the metadata landing method as claimed in any one of claims 1 to 3 when executing the computer program.
8. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program which, when executed by a processor, implements the steps of the metadata landing method according to any one of claims 1 to 3.
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| CN109976953A (en) * | 2019-04-10 | 2019-07-05 | 苏州浪潮智能科技有限公司 | A kind of data back up method |
| CN110673791B (en) * | 2019-09-06 | 2022-07-22 | 苏州浪潮智能科技有限公司 | Metadata refreshing method, device and equipment and readable storage medium |
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