CN114706720A - Method, system, equipment and storage medium for judging slow disk of distributed storage system - Google Patents
Method, system, equipment and storage medium for judging slow disk of distributed storage system Download PDFInfo
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Abstract
The invention discloses a method, a system, equipment and a storage medium for judging a slow disk of a distributed storage system, and belongs to the field of computer information processing. Aiming at the problems of easy false alarm and low speed of slow disc discovery and judgment in the prior art, the invention provides a method, a system, equipment and a storage medium for judging a slow disc of a distributed storage system, which comprises the following steps: acquiring read-write request data; the Storage system initiates a read-write request to a designated position on the hard disk through a Storage layer, and the Storage layer sends IO information of data to a slow disk discovery module; the slow disc discovery module acquires read-write delay data; sending the delay data into different delay data queues for storage according to different IO types; and performing delay judgment after a plurality of times of reading and writing, judging the data of different IO types by adopting different thresholds, and judging whether the hard disk is a slow disk. The method can accurately find the mechanical hard disk, reduce the error rate and has high efficiency.
Description
Technical Field
The present invention relates to the field of computer information processing, and more particularly, to a method, system, device, and storage medium for determining a slow disk in a distributed storage system.
Background
A large-scale storage system often consists of a large number of mechanical hard disks, and the hard disks can cause the Input/Output (IO) response time of the hard disks to be longer due to the degradation of magnetic heads or other mechanical and environmental problems, and become slow disks. And because IO of the storage system is often evenly distributed on a large number of hard disks, the performance of the whole system presents a barrel effect, and the performance of the whole system is obviously reduced as long as one slow disk is present. It is very necessary to monitor and isolate the slow disc. With the advent of the big data age, the scale of the storage system is also remarkably increased, the number of mechanical hard disks involved is more and more, and the discovery and isolation of the slow disk become an indispensable function in a large-scale storage system. In conventional storage systems, monitoring of slow disks is often done by operation and maintenance personnel. And when the performance of the whole system is reduced, the performance of each hard disk is observed and analyzed to speculate the occurrence of the slow disk and isolate the slow disk. This manual method requires a lot of manpower and is not real-time and accurate.
However, since the mechanical hard disk has a significant difference between sequential and random IO performance, it is not easy to determine whether the performance of one disk is normal. Taking a mechanical hard disk with normal performance as an example, the performance of reading the hard disk sequentially by using a data block of 1MB can reach 120MB/s, but if the performance of reading the data block of 4KB randomly is less than 800KB/s, the difference between the front and the back is more than 100 times. This is because for a mechanical disk, since for a normal mechanical hard disk, there is a seek time, i.e. a time for head movement, in addition to the real hard disk read time, so IO for random reading and writing is much more delayed than IO for sequential reading and writing. Therefore, if we use the same method to judge the delay without distinguishing different characteristics of random writing and sequential writing, a slow disc will be misinformed under the condition of random writing or a slow disc cannot be found in time under the condition of sequential writing or reading due to too low threshold.
In the prior art, only a detection mode for finding a slow disc is provided, but the speed of finding the corresponding slow disc is slow, and the efficiency is low; for example, chinese patent application No. 202011278532.3, published 2021, 2 and 26 discloses a slow disc detection method, apparatus, device and storage medium, wherein the method comprises: acquiring read-write time delay of each read-write request on a target hard disk within a preset time period; determining that the target hard disk is a slow disk according to the fact that the read-write time delay of each read-write request on the target hard disk in the preset time period meets a first condition and/or a second condition; the first condition includes: the proportion of the number of the slow requests in the preset time period to the total number of all the read-write requests in the preset time period is more than or equal to a first preset proportion; the second condition includes: and the average service time in the preset time period is greater than or equal to a preset service time threshold. Therefore, the hard disk with poor read-write performance in the storage system can be found in time through the scheme, and the hard disk cluster can be isolated, so that the problem that the performance of the system is reduced due to the existence of the slow disk is solved. However, the scheme is only to simply judge the slow disk from the hard disk reading and writing time, does not consider the speed condition of the hard disk under different reading and writing conditions, is not accurate enough in actual judgment, and does not consider the subsequent intervention problem.
Disclosure of Invention
1. Technical problem to be solved
The invention provides a method, a system, equipment and a storage medium for judging a slow disk of a distributed storage system, aiming at the problems of easy false alarm and low speed of slow disk discovery and judgment in the prior art, and the method, the system, the equipment and the storage medium can realize accurate discovery aiming at a mechanical hard disk, reduce the error rate and have high efficiency.
2. Technical scheme
The purpose of the invention is realized by the following technical scheme.
A method for judging slow disk of a distributed storage system comprises the following steps:
acquiring a read-write request;
initiating a read-write request to the hard disk through a Storage layer, positioning a specific position corresponding to the hard disk, and sending IO (input/output) information of data to a slow disk discovery module by the Storage layer;
the slow disk discovery module acquires delay data of different hard disks;
sending the delay data into different delay data queues for storage according to different IO information types;
and performing delay judgment after a plurality of read-write requests, performing delay judgment on data of different IO information types by adopting different thresholds, and judging whether the hard disk is a slow disk.
Furthermore, after the read-write request data is acquired, the content data of the user is organized and encrypted and then submitted to the storage layer.
Further, the IO information received by the slow disk discovery module includes the size of the data and the location information of the disk.
Furthermore, the delayed data acquisition mode is as follows, the Storage layer receives the read-write request of the Storage system to the specified position, inputs the read-write request to the slow disc discovery module, and records the current time as time 1; and submitting the read-write request to the hard disk by the Storage layer, processing the content data by the hard disk and returning, recording the time point as time2, and recording the delay time 2-time 1 of the read-write.
Furthermore, according to the IO type, three data request types, namely random read-write, sequential write and sequential read, are distinguished, and three delay data queues are correspondingly set.
Further, a slow disk flag is added once if the number of median bits of one type exceeds a threshold value.
Furthermore, after the hard disk passes through the slow disk marking for a plurality of times continuously, the corresponding hard disk is marked as a slow disk. And judging for a plurality of times continuously to prevent errors and ensure that the hard disk is a slow disk.
A slow disc judging system of a distributed storage system,
the storage system is used for acquiring read-write request data; initiating a read-write request to a designated position on the hard disk through a Storage layer, and sending IO information of data to a slow disk discovery module by the Storage layer;
the slow disc finding module is used for obtaining read-write delay data; sending the delay data into different delay data queues for storage according to different IO types; and performing delay judgment after a plurality of times of reading and writing, judging the data of different IO types by adopting different thresholds, and judging whether the hard disk is a slow disk.
An electronic device comprising a processor, an input device, an output device and a memory, the processor, the input device, the output device and the memory being connected in series, the memory being configured to store a computer program comprising program instructions, the processor being configured to invoke the program instructions to perform a method or a system as described above.
A readable storage medium, storing a computer program comprising program instructions, which when executed by a processor, cause the processor to perform a method or system as described above.
3. Advantageous effects
Compared with the prior art, the invention has the advantages that:
the scheme is used for counting IO delay according to different types, different thresholds are adopted for different types of IO, information of the slow disk can be accurately obtained, the method is suitable for all mechanical hard disks, the system can be not coupled with other modules of the system, the normal disk cannot be mistakenly judged as the slow disk, and the real slow disk cannot be missed.
Drawings
FIG. 1 is a schematic flow chart of the method of the present invention.
Detailed Description
The invention is described in detail below with reference to the drawings and specific examples.
Examples
The invention provides an algorithm for monitoring and alarming a mechanical hard disk (hereinafter referred to as a slow disk) with obviously attenuated performance in the field of computer information processing.
According to the scheme, the magnetic track position of the last reading and writing of the mechanical hard disk is recorded, the next hard disk delay is intelligently predicted, so that which type the IO information belongs to is judged, whether the IO information belongs to random reading and writing or sequential reading and writing, then the delays corresponding to different IO information are counted according to different types, different threshold values are adopted for different types of IO information, and if one type of reading and writing delay is abnormal, the IO information can be judged to be abnormal.
The invention relates to the field of software defined storage, in particular to monitoring and alarming based on disk performance in the field of computers.
The system is composed of an upper storage system and a slow disc discovery module. Firstly, a read-write request of a user is obtained, and the read-write request is submitted to a storage system by the user under a general condition. If the data is input from an external input device or an internal input device, receiving a read-write request of a user from a controller CPU, and sending the read-write request to a storage system; the data is divided into read-write request data serving as a command and content data needing to be read and written specifically;
the Storage system organizes and encrypts user content data and submits the user content data to a Storage layer (namely a Storage layer), and as the data of the Storage system enters the Storage layer, the Storage system initiates a read-write request to a specified position on a hard disk through the Storage layer; to a specific location on some mechanical hard disk.
And the corresponding Storage layer submits the IO information to a slow disc discovery module for real-time analysis, wherein the IO information is the size of data and the position information of a disc. The slow disc discovery module is arranged in the software system and used for acquiring and identifying the slow disc.
Referring to fig. 1, the Storage layer receives a read-write request of the Storage system to an assigned position, inputs IO information into the slow disc discovery module, and records the current time as time 1; submitting the read-write request to a hard disk, processing corresponding content data to be stored, returning the hard disk to a storage layer after the hard disk is processed, recording the time point as time2, and submitting the read-write delay (namely time 2-time 1) to a slow disk discovery module for analysis.
After receiving the size of the data of the IO instruction and the position of the disk each time, the slow disk discovery module can obtain the position of the magnetic head of the hard disk after the IO information is completed. From the final position, the head position of the hard disk should in fact be a three-dimensional model, but we can fully see it as a one-dimensional coordinate, i.e. the logical offset on the disk.
Because the instruction corresponding to each IO information can modify the position of the magnetic head of the current disk, when each IO information comes, the position of the magnetic head after the previous IO information is completed can be obtained. It can then be derived: whether the magnetic head needs to be moved greatly in order to complete the current IO information is determined by the magnetic disk.
If the head does not need to move greatly, the write is marked as random read-write, and if the head does not need to move greatly, the write is marked as sequential read-write according to the purpose of the IO information.
Briefly, the slow disk discovery module can determine what type of command we are based on the IO information, whether the command operation is random read/write, sequential write or sequential read,
in practical application, we find that there is a great difference in delay time between random read and write, sequential write and sequential read. Therefore, we preset three delay data queues, which are defined as random _ queue, read _ queue, and write _ queue, respectively, in this embodiment, and may also be defined as other queue names, put the delay time of each random read and write into random _ queue, put the delay time of each sequential write into write _ queue, and put the delay time of each sequential read into read _ queue. The slow disc discovery module periodically detects the three queues and adopts three different thresholds to ensure the correctness of the slow disc discovery.
The method includes the steps that a plurality of times are set for statistics, threshold judgment is conducted, statistics can be conducted once for every 10000 IO instructions in the embodiment, other quantities can be set according to requirements, and if overtime is detected as long as one type of median of the three types of IO delayed data exceeds the threshold, a slow disk mark is added. Here we choose the median determination, which can be done in other ways depending on the situation, such as a mean or a median plus variance determination. Different statistical methods are more reasonable.
Preferably, the slow disk of a certain hard disk is continuously marked for a plurality of times, that is, after a plurality of times of continuous overtime, the slow disk is marked, the storage system is informed in a reverse direction, and the corresponding hard disk is judged to be the slow disk. For example, 3 times in this example, if the timeout occurs for the first time, a slow disc timeout is recorded, a slow disc flag is added once, only the record is not reported, if the timeout is also detected in the next detection period (next 10000 IOs), a record is added in the same way, and if the timeout is not detected, the record is cleared. When the timeout is detected for 3 consecutive times, the callback is called, and the storage system is informed in reverse. The specific times can be selected according to requirements, such as a mode of finding for 2 times or 4 times continuously, the mode can prevent misinformation, prevent that the hard disk is directly misjudged due to accidental factors, and guarantee the service life of the whole system.
After the storage system obtains the corresponding signal, obtaining the position of the corresponding slow disk, and isolating the corresponding slow disk; this may include, but is not limited to, disconnecting, excluding the way it is outside of the overall operating system, etc.
The scheme is suitable for all mechanical hard disks. And may be uncoupled from other modules of the system. The method of the scheme is used for judging, so that the normal slow disk cannot be judged as the slow disk by mistake, and the real slow disk cannot be missed. And the judgment speed is higher, and the efficiency is higher.
The distributed storage system online real-time slow disk discovery method can be embedded into three large distributed storage systems, such as a block storage system, an object storage system and a file storage system, and gives an alarm when a slow disk is discovered by taking all offsets and delays of read-write operations on a hard disk in the system as input. The alarm is captured by the upper-layer system, the slow disk is isolated on the premise of not influencing the availability and reliability of the system, and the self-healing can be realized without manual intervention.
Exemplary computer program product and computer-readable storage Medium
In addition to the above-described methods and apparatus, embodiments of the present application may also be a computer program product comprising computer program instructions that, when executed by a processor, cause the processor to perform the steps in a decision-making behavior decision-making method according to various embodiments of the present application described in the "exemplary methods" section of this specification above.
The computer program product may be written with program code for performing the operations of embodiments of the present application in any combination of one or more programming languages, including an object oriented programming language such as Java, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computing device, partly on the user's device, as a stand-alone software package, partly on the user's computing device and partly on a remote computing device, or entirely on the remote computing device or server.
Furthermore, embodiments of the present application may also be a computer-readable storage medium having stored thereon computer program instructions that, when executed by a processor, cause the processor to perform steps in a decision-making behavior decision method according to various embodiments of the present application, described in the "exemplary methods" section above of this specification.
The computer-readable storage medium may take any combination of one or more readable media. The readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may include, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples (a non-exhaustive list) of the readable storage medium include: an electrical connection having one or more wires, a portable disk, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
The foregoing describes the general principles of the present application in conjunction with specific embodiments, however, it is noted that the advantages, effects, etc. mentioned in the present application are merely examples and are not limiting, and they should not be considered essential to the various embodiments of the present application. Furthermore, the foregoing disclosure of specific details is for the purpose of illustration and description and is not intended to be limiting, since the foregoing disclosure is not intended to be exhaustive or to limit the disclosure to the precise details disclosed.
The block diagrams of devices, apparatuses, systems referred to in this application are only given as illustrative examples and are not intended to require or imply that the connections, arrangements, configurations, etc. must be made in the manner shown in the block diagrams. These devices, apparatuses, devices, systems may be connected, arranged, configured in any manner, as will be appreciated by those skilled in the art. Words such as "including," "comprising," "having," and the like are open-ended words that mean "including, but not limited to," and are used interchangeably therewith. The words "or" and "as used herein mean, and are used interchangeably with, the word" and/or, "unless the context clearly dictates otherwise. The word "such as" is used herein to mean, and is used interchangeably with, the phrase "such as but not limited to".
It should also be noted that in the devices, apparatuses, and methods of the present application, the components or steps may be decomposed and/or recombined. These decompositions and/or recombinations are to be considered as equivalents of the present application.
The previous description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects without departing from the scope of the application. Thus, the present application is not intended to be limited to the aspects shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The foregoing description has been presented for purposes of illustration and description. Furthermore, the description is not intended to limit embodiments of the application to the form disclosed herein. While a number of example aspects and embodiments have been discussed above, those of skill in the art will recognize certain variations, modifications, alterations, additions and sub-combinations thereof.
The invention and its embodiments have been described above schematically, without limitation, and the invention can be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The representation in the drawings is only one of the embodiments of the invention, the actual construction is not limited thereto, and any reference signs in the claims shall not limit the claims concerned. Therefore, without departing from the spirit of the present invention, a person of ordinary skill in the art should also understand that the present invention shall not be limited to the embodiments and the similar structural modes of the present invention. Furthermore, the word "comprising" does not exclude other elements or steps, and the word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. Several of the elements recited in the product claims may also be implemented by one element in software or hardware. The terms first, second, etc. are used to denote names, but not any particular order.
Claims (10)
1. A method for judging slow disk of a distributed storage system comprises the following steps:
acquiring a read-write request;
initiating a read-write request to the hard disk through a Storage layer, positioning a specific position corresponding to the hard disk, and sending IO (input/output) information of data to a slow disk discovery module by the Storage layer;
the slow disk discovery module acquires delay data of different hard disks;
sending the delay data into different delay data queues for storage according to different IO information types;
and performing delay judgment after a plurality of read-write requests, performing delay judgment on data of different IO information types by adopting different thresholds, and judging whether the hard disk is a slow disk.
2. The method for determining the slow disc of the distributed storage system according to claim 1, wherein after the read-write request data is obtained, the content data of the user is organized and encrypted and then submitted to the storage layer.
3. The slow disc judging method of the distributed storage system according to claim 1, wherein the IO information received by the slow disc discovery module includes data size and location information of a magnetic disc.
4. The slow disc judgment method of the distributed Storage system according to claim 3, wherein the delayed data acquisition mode is as follows, the Storage layer receives a read-write request of the Storage system to an assigned position, inputs the read-write request to the slow disc discovery module, and records the current time as time 1; and submitting the read-write request to the hard disk by the Storage layer, processing the content data by the hard disk and returning, recording the time point as time2, and recording the delay time 2-time 1 of the read-write.
5. The method for judging the slow disk of the distributed storage system according to claim 1, 3 or 4, characterized in that three data request types, namely random read-write, sequential write and sequential read, are distinguished according to the IO type, and three delayed data queues are correspondingly set.
6. The slow disc determination method of claim 1, wherein the slow disc flag is incremented for each of a plurality of different types of delayed data queues as long as the median of one type exceeds a threshold.
7. The slow disk judging method of the distributed storage system according to claim 6, wherein when a hard disk is marked with a slow disk for several consecutive times, the corresponding hard disk is marked with a slow disk.
8. A slow disk judging system of a distributed storage system is characterized by comprising,
the storage system is used for acquiring read-write request data; initiating a read-write request to a designated position on the hard disk through a Storage layer, and sending IO information of data to a slow disk discovery module by the Storage layer;
the slow disc discovery module acquires read-write delay data; sending the delay data into different delay data queues for storage according to different IO information types; and performing delay judgment after a plurality of times of reading and writing, judging the data of different IO information types by adopting different thresholds, and judging whether the hard disk is a slow disk.
9. An electronic device comprising a processor, an input device, an output device, and a memory, the processor, the input device, the output device, and the memory being connected in series, the memory being configured to store a computer program comprising program instructions, the processor being configured to invoke the program instructions to perform the method of any one of claims 1 to 7 or the system of claim 8.
10. A readable storage medium, characterized in that the storage medium stores a computer program comprising program instructions which, when executed by a processor, cause the processor to perform the method of any one of claims 1-7 or the system of claim 8.
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| US20180157438A1 (en) * | 2015-07-31 | 2018-06-07 | Huawei Technologies Co., Ltd. | Slow-disk detection method and apparatus |
| CN109684140A (en) * | 2018-12-11 | 2019-04-26 | 广东浪潮大数据研究有限公司 | A kind of slow disk detection method, device, equipment and computer readable storage medium |
| US20200327020A1 (en) * | 2019-04-10 | 2020-10-15 | EMC IP Holding Company LLC | Predicting and handling of slow disk |
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| CN103488544A (en) * | 2013-09-26 | 2014-01-01 | 华为技术有限公司 | Processing method and device for detecting slow disk |
| US20180157438A1 (en) * | 2015-07-31 | 2018-06-07 | Huawei Technologies Co., Ltd. | Slow-disk detection method and apparatus |
| CN109684140A (en) * | 2018-12-11 | 2019-04-26 | 广东浪潮大数据研究有限公司 | A kind of slow disk detection method, device, equipment and computer readable storage medium |
| US20200327020A1 (en) * | 2019-04-10 | 2020-10-15 | EMC IP Holding Company LLC | Predicting and handling of slow disk |
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