TWI738739B - Hard disk data erasing method, server and system - Google Patents

Abstract

The present invention provides a hard disk data erasing method, server and system, wherein the method includes: sending a data write command to a disk cluster device; using the data write command to send a data write command to the disk cluster The mounted multiple hard disks are written with the first type data, thereby overwriting the original data. The invention can erase data from hard disks efficiently and non-destructively.

Description

Hard disk data erasing method, server and system

The invention relates to the field of computer technology, in particular to a hard disk data erasing method, server and system.

Mechanical hard disks (such as hard disk drives, Hard Disk Drives, HDDs) and solid state drives (Solid State Drives, SSDs) are commonly used storage components in data centers, and both have their own advantages. For example, solid-state hard disks have advantages in data reading speed, shock resistance, power consumption, operating sound, and heat generation; mechanical hard disks have the advantages of large capacity and low price.

For various reasons, storage components need to be taken out of the data center. In view of data security and related regulations, the data carried on the storage element must be effectively destroyed before being taken out of the data center to avoid data leakage. In addition, in the case of failure replacement, relocation, etc., the data also needs to be erased.

The current data destruction in some data centers uses permanent damage to the hard disk, such as permanent physical damage to the hard disk. After such physical damage, the existing data on the floppy disk cannot be restored, but at the same time, the life of the hard disk is ended, which directly causes the hard disk to fail to fully utilize its full life, thus increasing the maintenance of the data center cost.

One of the technical problems solved by the present invention is to provide a hard disk data erasing method, server and system.

According to an embodiment of an aspect of the present invention, there is provided a hard disk data erasing method, the method includes: sending a data write command to the disk cluster device; The multiple hard disks mounted in the disk cluster are written with the first type data, thereby overwriting the original data.

Optionally, after the data write operation, the method further includes: sending a verification read command to the disk cluster device to initiate a read verification operation; according to the verification read command, from the disk cluster device Multiple mounted hard disks read data in parallel; determine whether the read data is the repeated data or random data, thereby completing the verification.

Optionally, before initiating the data writing operation, the method further includes: controlling to start multiple hard disks mounted on the disk cluster device, and determining whether there are unrecognized hard disks; for unrecognized hard disks, Issue instructions for hot swap replacement.

Optionally, the method further includes: generating and saving an operation log for each controlled hard disk, and the operation log records the execution of commands and task completion status of the hard disk during the operation.

Optionally, the method further includes: providing an erasing configuration interface to the user; receiving configuration options input by the user on the erasing configuration interface, and performing erasing control according to the information of the configuration options; the configuration options include: Whether to erase the system hard disk, the model of the hard disk to be erased, and/or the erasing method.

Optionally, the method further includes: setting one or more SAS control modules corresponding to the one or more disk cluster devices respectively; in the SAS control module, the SAS control module is realized by a SAS expander. Set the hard disk array layout of multiple hard disks mounted on the corresponding disk cluster device.

Optionally, it further includes: in the SAS control module, the SAS expander is configured in a multi-stage cascading manner; through the multi-stage cascaded multilayer SAS expander, the number of controlled hard disks and the degree of parallelism are expanded.

Optionally, before the data writing operation or after the read verification operation, the method further includes: according to the cascading mode of the multi-stage cascaded multilayer SAS expander, according to the expansion from the highest-level SAS expander to the first-level SAS expander In the order of the controllers, start the hard disks corresponding to the SAS expanders at all levels in turn.

Optionally, it further includes: a hard disk failure identification panel analogous to the layout of the hard disk array; through the hard disk failure identification panel, the status of each hard disk is checked and the hard disk with abnormal status is located.

Optionally, the method controls one or more external disk cluster devices through the SAS protocol, and writes the first type of data to the hard disk mounted on the disk cluster in parallel, so as to write the first type of data to the disk cluster. The data of multiple hard disks mounted on the device are erased in batches.

Optionally, the first type of data is preset data, repeated data, random data, or template data.

According to an embodiment of another aspect of the present invention, there is provided a hard disk data erasing server, the server comprising: a write operation control module for sending data write commands to the disk cluster device; and , By using the data write command to control writing to multiple hard disks mounted on the disk cluster The first type of data, which overwrites the original data.

Optionally, it further includes: a read verification control module, configured to send a verification read command to the disk cluster device to initiate a read verification operation; according to the verification read command, read from the disk Multiple hard disks mounted in the cluster read data in parallel; and determine whether the read data is the repeated data or random data, so as to complete the verification.

Optionally, it further includes: a hard disk startup identification module, which is used to control the startup of multiple hard disks mounted on the disk cluster device and determine whether there are unidentified hard disks; and, for unidentified hard disks Hard disk, issued instructions for hot-swappable replacement.

Optionally, it also includes: an operation log module for generating and saving an operation log for each controlled hard disk, the operation log records the commands executed during the operation of the hard disk and the completion of tasks .

Optionally, it further includes: an erasing configuration interface module for providing a user with an erasing configuration interface; and, receiving configuration options input by the user on the erasing configuration interface, according to information about the configuration options Perform erasing control; the configuration options include: whether to erase the system hard disk, the model of the hard disk to be erased, and/or the erasing method.

Optionally, it further includes: one or more SAS control modules, respectively corresponding to the one or more disk cluster devices, and used to implement the disk cluster devices corresponding to the SAS control module through the SAS expander The hard disk array layout of the mounted multiple hard disks.

Optionally, the SAS control module is also used to configure the SAS expander in a multi-stage cascading manner, with the multi-stage cascaded multi-layer SAS expander, Expand the number of hard drives controlled and the degree of parallelism.

Optionally, the SAS control module is further configured to start sequentially according to the cascade mode of the multi-level cascaded multilayer SAS expander, and according to the order from the highest-level SAS expander to the first-level SAS expander Hard disks corresponding to all levels of SAS expanders.

Optionally, it further includes: a hard disk failure identification panel module, which is used to compare the hard disk failure identification panel corresponding to the hard disk array layout; and, through the hard disk failure identification panel, check the status of each hard disk and Locate the hard disk with abnormal status.

Optionally, the server controls one or more external disk cluster devices through the SAS protocol, and writes the first type of data to the hard disks mounted in the disk cluster in parallel, so as to write to the disk clusters. The data of multiple hard disks mounted on the cluster device are erased in batches.

Optionally, the first type of data is preset data, repeated data, random data, or template data.

According to an embodiment of still another aspect of the present invention, a hard disk data erasing system is provided. The system includes the server described in any one of the above and a disk cluster device.

It can be seen that the present invention designs and constructs a set of solutions suitable for parallel erasing of original data on hard disks by applying relatively stable SAS interconnection technology. This program can be used for data erasure in data centers. The invention has the advantage of high parallelism. With SAS expansion, nearly a thousand mechanical hard disks and solid state hard disks can be written in parallel, thereby realizing effective and rapid erasing of data. Specifically, the erase server directly issues SAS commands to the hard disk to the disk cluster setting. In addition, the SAS card controls the erasing process, avoiding the I/O communication between the operating system and the hard disk during the erasing process, which greatly saves system resources and is also a manifestation of the high concurrency mentioned above.

The invention only needs an ordinary server as the head to complete the corresponding functions such as data writing, erasure verification, log analysis and bad hard disk recording. The overall investment is controllable, and the non-destructive data destruction of nearly 1,000 large-capacity hard disks can be completed in a short time. The so-called non-destructive refers to the non-destructive of the hard disk, and the data is permanently destroyed without any data fragments remaining. Compared with the existing permanent physical damage to the hard disk, the solution of the present invention can ensure that the original data is effectively covered, so that the erased mechanical hard disk and solid state hard disk can still be used.

Those of ordinary skill in the art will understand that although the following detailed description will be made with reference to the illustrated embodiments and the drawings, the present invention is not limited to these embodiments. Rather, the scope of the present invention is broad, and it is intended that the scope of the present invention is limited only by the appended patent scope.

801‧‧‧Write operation control module

802‧‧‧Reading verification control module

803‧‧‧Hard disk boot identification module

804‧‧‧Operation log module

805‧‧‧Erase configuration interface module

806‧‧‧SAS control module

807‧‧‧Fault Recognition Module

By reading the detailed description of the non-limiting embodiments with reference to the following drawings, the other features, purposes and advantages of the present invention will become more apparent: Figure 1 is a hard disk data erasure according to an embodiment of the present invention A flowchart of the method; FIG. 2 is a schematic diagram of the principle of writing data to a hard disk in a method for erasing hard disk data according to an embodiment of the present invention; FIG. 3 is a schematic diagram of the top-level structure of data erasing in a hard disk data erasing method according to an embodiment of the present invention; FIG. 4 is a schematic diagram of an expansion method of a SAS control module in a hard disk data erasing method according to an embodiment of the present invention; FIG. 5 Fig. 6 is a schematic diagram of the erase process in the hard disk data erasing method according to an embodiment of the present invention; Fig. 7 is a schematic diagram of the closing erase process in the hard disk data erasing method according to an embodiment of the present invention; A schematic diagram of the hard disk failure identification panel in the method for erasing hard disk data; FIG. 8 is a schematic diagram of the structure of a hard disk data erasing server according to an embodiment of the present invention.

Those of ordinary skill in the art will understand that although the following detailed description will be made with reference to the illustrated embodiments and the drawings, the present invention is not limited to these embodiments. Rather, the scope of the present invention is broad, and it is intended that the scope of the present invention is limited only by the appended patent scope.

Before discussing the exemplary embodiments in more detail, it should be mentioned that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although the flowchart describes the operations as sequential processing, many of the operations can be implemented in parallel, concurrently, or simultaneously. In addition, the order of operations can be rearranged. The processing can be terminated when its operation is completed, but it can also have additional steps not included in the drawings. Sudden. The processing can correspond to methods, functions, procedures, subroutines, subroutines, and so on.

The computer equipment includes user equipment and network equipment. Wherein, the user equipment includes but is not limited to computers, smart phones, PDAs, etc.; the network equipment includes, but is not limited to, a single network server, a server group composed of multiple network servers, or cloud-based computing ( Cloud Computing is a cloud composed of a large number of computers or network servers. Among them, cloud computing is a kind of distributed computing, a super virtual computer composed of a group of loosely coupled computer sets. Wherein, the computer device can run alone to implement the present invention, or it can be connected to a network and implemented through interactive operations with other computer devices in the network. Wherein, the network where the computer equipment is located includes but is not limited to the Internet, wide area network, metropolitan area network, local area network, VPN network, etc.

It should be noted that the user equipment, network equipment, network, etc. are only examples, and other existing or future computer equipment or networks that can be applied to the present invention should also be included in the protection scope of the present invention. Within and included here by reference.

The methods discussed later (some of which are shown by flowcharts) can be implemented by hardware, software, firmware, intermediary software, microcode, hardware description language, or any combination thereof. When implemented with software, firmware, intermediary software, or microcode, the code or code fragments used to perform the necessary tasks can be stored in a machine or computer-readable medium (such as a storage medium). The processor(s) can perform the necessary tasks.

The specific structure and function details disclosed here are only representative. And it is used for the purpose of describing exemplary embodiments of the present invention. However, the present invention can be embodied in many alternative forms, and should not be construed as being limited only to the embodiments set forth herein.

It should be understood that, although the terms "first", "second", etc. may be used herein to describe various units, these units should not be limited by these terms. These terms are used only to distinguish one unit from another. For example, without departing from the scope of the exemplary embodiment, the first unit may be referred to as the second unit, and similarly the second unit may be referred to as the first unit. The term "and/or" as used herein includes any and all combinations of one or more of the associated items listed.

It should be understood that when a unit is referred to as being "connected" or "coupled" to another unit, it can be directly connected or coupled to the other unit, or intervening units may be present. In contrast, when a unit is said to be "directly connected" or "directly coupled" to another unit, there is no intermediate unit. Other words used to describe the relationship between units should be interpreted in a similar way (for example, "between" as opposed to "directly between" and "adjacent to" Compared to "directly adjacent to" etc.).

The terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments. Unless the context clearly dictates otherwise, the singular forms "a" and "one" used herein are also intended to include the plural. It should also be understood that the terms "including" and/or "including" used herein specify the stated features, integers, steps, operations, units, and The presence of/or elements does not exclude the presence or addition of one or more other features, integers, steps, operations, units, elements, and/or combinations thereof.

It should also be mentioned that in some alternative implementations, the mentioned functions/acts may occur in a different order than indicated in the drawings. For example, depending on the functions/actions involved, the two figures shown one after the other may actually be executed substantially simultaneously or sometimes in the reverse order.

First, the technical terms appearing in the embodiments of the present invention are explained: SAS (Serial Attached SCSI) is a disk connection technology, which combines the advantages of parallel SCSI and serial connection technology, and uses SCSI-3 to expand. The instruction set is compatible with SATA devices and is a multi-level storage device connection protocol stack.

The SAS Expander (SAS Expander) is a functional module in the SAS protocol, which is used to connect multiple SAS devices, including SAS array cards, SAS hard disks, etc., to form a SAS domain.

The smallest unit of disk file storage management is called "cluster". Disk cluster device (JBOD device) is a storage device with multiple disk drives installed on a base plate.

The first type of data is used to overwrite the original data to achieve data erasure, including but not limited to preset data, repeated data, random data, or template data. For example, repeated data can be data with all zeros, random data is data automatically and randomly generated by a machine, default data is preset data, and template data is data generated based on a preset template. The first type of data is generally meaningless data, as long as the original data is overwritten to achieve data erasure. There is no restriction on the specific form of the information.

The technical scheme of the present invention will be described in further detail below in conjunction with the accompanying drawings.

Fig. 1 is a flowchart of a method for erasing data from a hard disk according to an embodiment of the present invention. The method is used for batch erasing data from multiple solid-state hard disks or mechanical hard disks. The erasing server uses SAS ( The Serial Attached SCSI protocol controls one or more external Just a Bunch Of Disks (JBOD) devices, thereby wiping the data of multiple hard disks mounted on the disk cluster devices in batches remove.

The method of this embodiment mainly includes the following steps: S100, the wipe server controls and activates the multiple hard disks mounted on the disk cluster device, and determines whether there are unrecognized hard disks; for the unrecognized hard disks, issue Instructions for hot swap replacement; S101. The erase server sends a data write command to the disk cluster device, and writes the first type in parallel to the multiple hard disks mounted in the disk cluster through the data write command Data, so as to overwrite the original data; S102, the erase server sends a verification read command to the disk cluster device to initiate a read verification operation; according to the verification read command, from multiple hard drives mounted in the disk cluster The disc reads data in parallel; it is judged whether the read data is the first type of data, so as to complete the verification.

In the embodiment of the present invention, the hard disk includes, but is not limited to, high-density storage devices such as a mechanical hard disk (such as a hard disk drive, Hard Disk Drive, HDD) and a solid state drive (SSD).

In this embodiment, the wipe server uses the SAS protocol and mounts the hard disk The floppy disk clusters communicate with each other, and the data can be erased on the hard disks mounted on the floppy disk clusters. SAS is a disk connection technology that combines the advantages of parallel SCSI and serial connection technology. It adopts SCSI-3 extended instruction set and is compatible with SATA devices. It is a multi-level storage device connection protocol stack. JBOD equipment is an important storage device in the storage field. JBOD equipment is a storage device with multiple disk drives installed on a base plate. Often referred to as Span. Unlike RAID arrays, JBOD does not have front-end logic to manage the data distribution on the disks. Instead, each disk is individually addressed as a separate storage resource, or is based on a part of the host software, or an adapter card in the RAID group.

Specifically, the erasing server is responsible for identifying the faulty hard disk (S100) and initiating data writing to realize data erasing (S101), read verification (S102), and so on.

Step S100 is a preparatory step for erasing data, mainly to check whether all hard disks are booted, and to determine whether any hard disks are unrecognizable due to problems such as failures, and to inform engineers to perform hot swap replacement for unrecognized hard disks. It can be understood that S100 is an optional preparation step and is not necessary, that is, this step can be omitted.

Step S101 is a step of completing data erasure. The erasing server sends a data write command to the disk cluster device to initiate a data write operation; according to the data write command, the first type of data is written to multiple hard disks mounted in the disk cluster in parallel, thereby overwriting the original There is information. The first type of data here, for example, can be all 0 data, or random data, as long as the original data is overwritten to achieve data erasure, and the specific form of the first type of data is not done. limit.

In order to realize the writing control of the first type of data to the hard disk, it can be realized by setting the SAS control module in the erasing server. Specifically, one or more SAS control modules corresponding to the number of disk cluster devices are set in the erasing server (that is, each SAS control module controls one disk cluster device); in the SAS control module, borrow The SAS Expander (SAS Expander) realizes the hard disk array layout of multiple hard disks mounted on the corresponding disk cluster device. Among them, SAS Expander is a functional module in the SAS protocol, which is used to connect multiple SAS devices together, including SAS array cards, SAS hard disks, etc., to form a SAS domain. SAS Expander can connect multiple SASs to a limited number of host ports. In the SAS domain, SAS Expander can play a central switching role and can directly connect to terminal devices.

In order to achieve the expansion of the number of controlled hard disks and the degree of parallelism, a multi-level cascading method of multi-layer SAS expanders can be adopted. For example, in the SAS control module, a multi-stage cascading mode of four-layer SAS expanders is configured; through the multi-stage cascaded four-layer SAS expander, the number of controlled hard drives and the degree of parallelism are expanded. In the multi-level cascade mode of multi-level SAS expander, before the data write operation or after the read verification operation, the order of starting the SAS expander and the corresponding hard disk at each level is: according to the multi-level cascade multi-level SAS expansion The cascading method of the SAS expander is based on the order from the highest-level SAS expander to the first-level SAS expander, and the hard disks corresponding to each level of the SAS expander are activated in turn. For example, assuming that four-layer SAS expanders are used: level1, level2, level3, and level4, where level4 is the highest level, then the startup sequence is, The order of level4, level3, level2 to level1.

Step S102 is mainly to verify whether the written data is a predefined first type data after the data erasure is completed. It can be seen that this step is mainly to determine the correctness of the data erasure, and is an optional step, not a necessary step.

Optionally, a hard drive failure identification panel (such as a software control interface) corresponding to the layout of the hard drive array can be analogized; through the hard drive failure identification panel, the status of each hard drive can be checked and the hard drive with abnormal status can be located .

Optionally, an operation log can be generated and saved for each hard disk under control, and the operation log records the commands executed during the operation of the hard disk and the completion of tasks.

Optionally, it can also support user-defined erasing modes, and users can choose a suitable erasing mode according to their own business scenarios. Specifically, the user is provided with an erasing configuration interface; the configuration options input by the user on the erasing configuration interface are received, and the configuration options include: whether to erase the system hard disk, the model of the hard disk to be erased, and/or , Wipe method.

The hard disk in the present invention includes, but is not limited to, high-density storage devices such as mechanical hard disks and solid-state hard disks. For the sake of intuition, the following uses a mechanical hard disk as an example to introduce the method embodiment of the present invention in detail.

In the present invention, multiple hard disks are written in parallel to cover the existing content on the hard disk surface. Therefore, the selected fixed data mode, such as the all-zero mode or the random number mode, changes the content recorded on the disk into meaningless data. This action includes erasing all sectors of the hard disk to avoid information leakage caused by any content remaining.

Refer to FIG. 2, which is a schematic diagram of the principle of writing data to a hard disk in a method for erasing hard disk data according to an embodiment of the present invention. As shown in Figure 2, the surface of the hard disk is covered with a soft magnetic material, which can magnetize the storage medium particles into N->S or S->N two different magnetic field directions, and respectively represent the recorded bit is 0 or 1. The magnetization process realizes the magnetic field in different directions by changing the current direction of the energized coil wound on the magnetic head in the figure. Therefore, the mechanical hard disk writing data directly maintains or reverses the reasonable magnetization direction of the medium and directly covers the original data with new data, and the entire process does not need to be erased. Therefore, hard disk erasure is to rewrite existing data into non-realistic data, such as all-zero data or random data, which means that the original information cannot be restored. When all sectors of the entire hard disk are rewritten, the hard disk can successfully declare that it has met the data security requirements, and there is no possibility of data leakage. The mechanical hard disk processed in this way is equivalent to overwriting the entire hard disk once, and there is no harmful damage to the hard disk itself, so that its usability can be maintained.

Referring to FIG. 3, it is a schematic diagram of the top-level structure of data erasing in a hard disk data erasing method according to an embodiment of the present invention.

The data erasure top-level structure provided by the present invention mainly consists of two parts:

(1) Wiping server (head): The erasing server (head) serves as the initiator of data writing, the control terminal of the erasing operation, the verification management terminal, and the fault recording terminal. The invention can use only one physical server to realize simultaneous erasing of nearly a thousand mechanical hard disks and related work, and has high resource utilization efficiency.

(2) External JBOD device: Wipe the server through the SAS cable connection Connect to external JBOD devices, and each JBOD device is equipped with multiple mechanical hard disks. All hard disks are presented on the server head in the form of "block" devices. The server head directly controls each hard disk and performs corresponding operations.

In this example, a dual-channel structure is adopted, and two SAS cards (SAS control modules) are installed inside the erasing server to expand to each level of hard disks in their respective external JBOD devices in parallel. The SAS card is connected to the server CPU and memory system through the PCIe bus. The bandwidth of a single channel is the PCIe bus bandwidth. For example, PCIe 3.0 x 8 can achieve a maximum bandwidth of 8GB/sec. For mechanical hard drives, this Similar to devices with lower throughput performance, it can effectively increase concurrency to write to a large number of hard disk devices at the same time.

Let's take one SAS expansion for introduction.

Refer to FIG. 4, which is a schematic diagram of the expansion method of the SAS control module in the hard disk data erasing method according to the embodiment of the present invention. Figure 4 shows the expansion architecture of the present invention. In the figure, for simplification, A represents the SAS expander A, and B represents the SAS expander B. The SAS expander B is connected to multiple hard disks. With the SAS expander, the interconnection of the present invention continues to extend downward. A single SAS control module drives two paths in parallel, and each path is expanded in four levels. SAS expander A has N SAS 3.0 channels, and SAS expander B has M SAS 3.0 channels, where N>M. With the four-layer SAS expander cascade as shown in Figure 4, the purpose is to increase the number of connectable hard disks, thereby increasing the degree of parallelism.

Referring to FIG. 5, it is a schematic diagram of the process of starting the erasing in the hard disk data erasing method according to an embodiment of the present invention. It includes the following steps: S501: Start the hard disk with the highest level, that is, level 4 (level 4); S502: Start the hard disk with the second highest level, namely the third level (level3); S503: Start the hard disk with the next lower level, the second level (level2); S504: Start the hard disk with the lowest level, the first level (level1); S505 : Start the erasing server; S506: Write the first type of data to all visible hard disks in parallel.

Referring to FIG. 6, it is a schematic diagram of a closing erasing process in a hard disk data erasing method according to an embodiment of the present invention.

S601: All hard disks are erased and the read verification is completed; S602: the hard disk with the highest booting level is the fourth (level4); S603: the hard disk with the second highest booting is the third level (level3); S604: the hard disk is booted again The lower level is the second (level2) hard disk; S605: the lowest level is the first level (level1) hard disk; S606: the wipe server is started.

During the implementation of the method, the following aspects need to be considered. After opening the external JBOD device step by step and starting the wipe server, the first round will detect the unrecognized hard disk in the server. If any hard disk is inoperable, hot-swappable and replace it so that data can be written to overwrite the original information. The hot-swappable and replaceable hard drive will also be tested for offline hard drive testing, and it will be marked as a bad hard drive that is not working properly. Since the written data is all 0 data and the written data is fixed, the user data transmission volume from the server is very low, and the main transmission information is control information such as metadata. The written data can be directly cached in the internal cache module of the hard disk.

In order to ensure that the all-zero field is successfully written to all sectors of the hard disk to cover the existing content, the read verification operation can be performed after the data is written. Specifically, write information After entering, the server starts the data read operation and directly checks whether the data written in the sector is all zeros. Read verification and write coverage are performed simultaneously, and the two are deliberately staggered in a certain physical interval. Therefore, after the full hard disk is filled, the read verification will be completed in a short time. Both write overwrite and read verification adopt sequential write and sequential read methods to maximize the throughput of the operated hard disk, thereby shortening the time for data erasure.

In data erasing, corresponding to each erased hard disk, an operation log can be generated on the erasing server. The operation log can record in detail the commands executed by nearly a thousand hard disks in their respective erasing and the completion of tasks, ensuring that records are kept for each operation. The operation log record will be used in many subsequent links. For example, when the storage hard disk is taken out of the data center, combined with the serial number of each hard disk, the related operation log will be scanned to confirm the hard disk. The disc has been erased correctly and effectively.

In order to effectively monitor the erasing process, especially to identify the hard disk that has failed during the erasing process, a hard disk failure identification panel implemented by software can be used to observe. Refer to FIG. 7, which is a schematic diagram of a hard disk failure identification panel in a hard disk data erasing method according to an embodiment of the present invention. The number of rows Nch represents the number of channels, and the number of columns Ndr represents the number of erased hard disks in each channel. Hard disks are indicated by small dots. During the entire data erasing process, any abnormal situation that occurs on any hard disk at any time for any reason will be reflected on this panel. Based on clear instructions, on-site engineers can quickly locate the problematic hard drive and replace it accordingly. The fault identification panel receives the control signals transmitted by the SAS card and its SAS expanders at all levels, and generates a corresponding dynamically updated user interface.

It can be seen that the present invention designs and constructs a set of solutions suitable for parallel erasing of original data on hard disks by applying relatively stable SAS interconnection technology. This program can be used for data erasure in data centers. The invention has the advantage of high parallelism. With SAS expansion, nearly a thousand mechanical hard disks and solid state hard disks can be written in parallel, thereby realizing effective and rapid erasing of data. Specifically, the erasing server directly issues SAS commands to the hard disk to the disk cluster device, and controls the erasing process by the SAS card, which avoids always using the operating system and the hard disk to perform I/O during the erasing process. O communication greatly saves system resources and is also a manifestation of the aforementioned high concurrency.

The invention has the characteristics of high concurrency and high efficiency, and can write nearly a thousand hard disks in parallel. At the same time, only an ordinary server is needed as the head to complete the corresponding functions such as data writing, erasure verification, log analysis and bad hard disk recording. The overall investment is controllable, and the non-destructive data destruction of nearly 1,000 large-capacity hard disks can be completed in a short time. The so-called non-destructive refers to the non-destructive of the hard disk, and the data is permanently destroyed without any data fragments remaining. Compared with the existing permanent physical damage to the hard disk, the solution of the present invention can ensure that the original data is effectively covered, so that the erased mechanical hard disk and solid state hard disk can still be used.

The invention supports users to customize the erasing mode, and the user can choose the erasing mode suitable for them according to their own business scenarios, such as whether to erase the SDA system disk, the model of the hard disk that needs to be erased, and the erasing method.

The embodiment of the present invention provides a server for erasing hard disk data corresponding to the above method. One or more external disk cluster devices are controlled by SAS protocol, so as to control the data mounted on the disk cluster device. Multiple hard drives The data is erased in batches.

Referring to FIG. 8, the server includes: a write operation control module 801, which is used to send a data write command to the disk cluster device to initiate a data write operation; and, by the data write command, control the data to The multiple hard disks mounted in the disk cluster write the first type data in parallel, thereby overwriting the original data.

Optionally, the server further includes: a read verification control module 802, configured to send a verification read command to the disk cluster device to initiate a read verification operation; according to the verification read command, from The multiple hard disks mounted on the disk cluster read data in parallel; and determine whether the read data is the first type data, so as to complete the verification.

Optionally, the server further includes: a hard disk startup identification module 803, which is used to control the startup of multiple hard disks mounted on the disk cluster device and determine whether there are unrecognized hard disks; and, For unrecognized hard disks, instructions for hot-swappable replacement are issued.

Optionally, the server further includes: an operation log module 804 for generating and saving an operation log for each hard disk controlled, the operation log records the commands executed during the operation of the hard disk , Task completion status.

Optionally, the server further includes: an erasing configuration interface module 805 for providing an erasing configuration interface to the user; and receiving the configuration entered by the user on the erasing configuration interface The configuration options are used for erasing control according to the information of the configuration options; the configuration options include: whether to erase the system hard disk, the model of the hard disk to be erased, and/or the erasing method.

Optionally, the server further includes: one or more SAS control modules 806, respectively corresponding to the one or more disk cluster devices, and used to implement the SAS control module corresponding to the SAS expander The hard disk array layout of multiple hard disks mounted by the disk cluster device.

Optionally, the SAS control module 806 is also used to configure the SAS expander in a multi-stage cascading manner, through the multi-stage cascaded multilayer SAS expander, the number of controlled hard disks and the parallelism are expanded.

Optionally, the SAS control module 806 is further configured to follow the cascading mode of the multi-level cascaded multilayer SAS expander, and according to the order from the highest-level SAS expander to the first-level SAS expander. Start the hard disk corresponding to the SAS expander at all levels.

Optionally, the server further includes: a fault identification module 807 for analogy with a hard disk failure identification panel corresponding to the hard disk array layout; and, through the hard disk failure identification panel, view the status of each hard disk And locate the hard disk in abnormal state.

In addition, the present invention also provides a hard disk data wiping system, which includes the server and disk cluster device as described in FIG. 8, wherein the server controls one or more external disks through the SAS protocol. A cluster device is used to erase data of multiple hard disks mounted on the disk cluster device in batches.

It should be noted that the present invention can be implemented in software and/or a combination of software and hardware. For example, it can be implemented using a dedicated integrated circuit (ASIC), a general purpose computer or any other similar hardware device. In one embodiment, the software program of the present invention can be executed by a processor to realize the above-mentioned steps or functions. Similarly, the software programs (including related data structures) of the present invention can be stored in computer-readable recording media, such as RAM memory, magnetic or optical drives or floppy disks and similar devices. In addition, some steps or functions of the present invention may be implemented by hardware, for example, as a circuit that cooperates with a processor to perform various steps or functions.

In addition, a part of the present invention can be applied as a computer program product, such as a computer program instruction. When it is executed by a computer, the method and/or technical solution according to the present invention can be invoked or provided by the operation of the computer. The program instructions for invoking the method of the present invention may be stored in a fixed or removable recording medium, and/or be transmitted by data flow in broadcast or other signal-bearing media, and/or be stored in accordance with the The program instructions run in the working memory of the computer equipment. Here, an embodiment according to the present invention includes a device including a memory for storing computer program instructions and a processor for executing program instructions, wherein when the computer program instructions are executed by the processor, Triggering the operation of the device is based on the aforementioned methods and/or technical solutions according to multiple embodiments of the present invention.

For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. therefore, Regardless of the point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the scope of the attached patent application rather than the above description, so it is intended to fall within the scope of the patent application. All changes within the meaning and scope of the equivalent elements of are included in the present invention. Any reference signs in the scope of the patent application should not be regarded as limiting the scope of the patent application involved. In addition, it is obvious that the word "including" does not exclude other units or steps, and the singular does not exclude the plural. Multiple units or devices stated in the scope of the system patent application can also be implemented by one unit or device by software or hardware. Words such as first and second are used to denote names, but do not denote any specific order.

Claims (21)

A method for erasing hard disk data, comprising: sending a data write command to a disk cluster device; providing a user with an erasing configuration interface; receiving configuration options entered by the user on the erasing configuration interface, Perform erasure control according to the information of the configuration options; the configuration options include: whether to erase the system hard disk, the model of the hard disk to be erased, and/or the erasing method; and by the data writing command , To write the first type of data to the hard disk mounted on the disk cluster, thereby overwriting the original data. The method according to claim 1, wherein, after the data writing operation, the method further comprises: sending a verification read command to the disk cluster device; according to the verification read command, from the disk cluster Multiple mounted hard disks read data in parallel; determine whether the read data is the repeated data or random data, thereby completing the verification. The method according to claim 1, wherein, before initiating the data writing operation, the method further includes: controlling to start a plurality of hard disks mounted on the disk cluster device, and determining whether there are unrecognized hard disks; For unrecognized hard disks, instructions for hot-swappable replacement are issued. The method according to claim 1, wherein Including: For each controlled hard disk, an operation log is generated and saved, and the operation log records the execution of the command and task completion status of the hard disk during the operation. The method according to any one of claim items 1-4, further comprising: setting one or more SAS control modules corresponding to the one or more disk cluster devices; In the module, the SAS expander is used to implement the hard disk array layout of the multiple hard disks mounted on the disk cluster device corresponding to the SAS control module. The method according to claim 5, which further includes: configuring the SAS expander in the SAS control module in a multi-stage cascading manner; and expanding the controlled The number of hard drives and the degree of parallelism. The method according to claim 6, wherein, before the data write operation or after the read verification operation, the method further includes: according to the cascade mode of the multi-level cascaded multilayer SAS expander, according to the highest level SAS expansion In the sequence of the first-level SAS expander, start the hard disks corresponding to each level of SAS expander in turn. The method according to claim 5, which further includes: Analogous to the hard disk failure identification panel corresponding to the hard disk array layout; through the hard disk failure identification panel, the status of each hard disk is checked and the hard disk with abnormal status is located. The method according to claim 1, wherein one or more external disk cluster devices are controlled by the SAS protocol to write the first type of data to the hard disks mounted in the disk cluster in parallel, so that all The data of multiple hard disks mounted on the disk cluster device are erased in batches. The method according to claim 1, wherein the first type of data is preset data, repeated data, random data, or template data. A hard disk data erasing server, characterized in that, the server includes: a write operation control module for sending a data write command to a disk cluster device; and, according to the data write command, control to The multiple hard disks mounted in the disk cluster are written with the first type data so as to overwrite the original data; the erasing configuration interface module is used to provide the user with the erasing configuration interface; and, receiving the user's The configuration options entered on the erase configuration interface are erased according to the information of the configuration options; the configuration options include: whether to erase the system hard disk, the model of the hard disk to be erased, and/or erase In addition to the way. The server according to claim 11, further comprising: a read verification control module for sending a verification read command to the disk cluster device; according to the verification read command, from the Disk cluster mounted Multiple hard disks read data in parallel; and determine whether the read data is the repeated data or random data, so as to complete the verification. The server according to claim 11, which further includes: a hard disk startup identification module, which is used to control the startup of multiple hard disks mounted on the disk cluster device and determine whether there are unidentified hard disks. And, for unrecognized hard disks, issue instructions for hot-swappable replacement. The server according to claim 11, which further includes: an operation log module for generating and saving an operation log for each controlled hard disk, and the operation log records the operation of the hard disk The execution of the command and the completion of the task. The server according to any one of claim 11-14, further comprising: one or more SAS control modules, respectively corresponding to the one or more disk cluster devices, for The SAS expander implements the hard disk array layout of multiple hard disks mounted on the disk cluster device corresponding to the SAS control module. The server according to claim 15, wherein the SAS control module is also used to configure the SAS expander in a multi-level cascade mode, and the multi-level cascade multi-layer SAS expander expands the controlled hardware The number of dishes and the degree of parallelism. The server according to claim 16, wherein the SAS control module is further configured to be cascaded according to the multiple The cascading mode of the SAS expander at each level is based on the order from the highest-level SAS expander to the first-level SAS expander, and the hard disks corresponding to the SAS expanders at each level are sequentially activated. The server according to claim 15, which further includes: a fault identification module for analogy with a hard disk fault identification panel corresponding to the layout of the hard disk array; and, through the hard disk fault identification panel, view each The status of the hard disk and locate the abnormal hard disk. The server according to claim 11, wherein the server controls one or more external disk cluster devices through the SAS protocol to write the first type in parallel to the hard disks mounted on the disk cluster Data, so that the data of multiple hard disks mounted on the disk cluster device are erased in batches. The server according to claim 11, wherein the first type of data is preset data, repeated data, random data, or template data. A hard disk data erasing system, which is characterized by comprising a disk cluster device and the server according to any one of claims 11-20.

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