WO2017190578A1

WO2017190578A1 - Hard disk data wiping method, server and system

Info

Publication number: WO2017190578A1
Application number: PCT/CN2017/079863
Authority: WO
Inventors: 牛功彪; 蔡进; 邹巍; 张文涛; 李舒
Original assignee: 阿里巴巴集团控股有限公司; 牛功彪; 蔡进; 邹巍; 张文涛; 李舒
Priority date: 2016-05-06
Filing date: 2017-04-10
Publication date: 2017-11-09
Also published as: CN107346210A; CN107346210B; TWI738739B; TW201740370A

Abstract

A hard disk data wiping method, a server and a system, the method comprising: transmitting a data write command to a disk cluster device; writing first-type data to the plurality of hard disks mounted on the disk cluster to overwrite original data. The method can be used for wiping data from a hard disk in an efficient and non-destructive way.

Description

Hard disk data erasing method, server and system

Technical field

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

Background technique

Mechanical hard drives (such as hard disk drives, Hard Disk Drives, HDDs) and solid state drives (SSDs) are common storage components used in data centers, and each has its own advantages. For example, SSDs have advantages in data read speed, shock resistance, power consumption, operating sound, and heat generation; while mechanical hard disks have the advantages of large capacity and low price.

Storage components need to come out of the data center for a variety of reasons. In view of data security and related specifications, the data carried on the storage component must be effectively destroyed before taking out the data center to avoid data leakage. In addition, in the case of fault replacement, relocation, etc., it is also necessary to erase the data.

The current data destruction in some data centers uses a permanent method of destroying the hard disk, such as permanent physical damage to the hard disk. After such physical damage, the existing data on the disk cannot be recovered, but at the same time, the end of the service life of the disk directly leads to the failure of the hard disk to fully utilize its entire service life, thus increasing the maintenance cost of the data center.

Summary of the invention

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, a hard disk data erasing method is provided, the method comprising: transmitting a data write command to the disk cluster device; writing by the data The input command writes the first type of data to the plurality of hard disks mounted by the disk cluster, thereby overwriting the original data.

Optionally, after the data write operation, the method further includes: sending a check read command to the disk cluster device, initiating a read verify operation; and mounting from the disk cluster according to the check read command The plurality of hard disks read data in parallel; and judge 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 is an unrecognizable hard disk; and performing hot plugging for the unrecognized hard disk Pull out the replacement instructions.

Optionally, the method further includes: generating and saving an operation log for each controlled hard disk, where the operation log records a command executed by the hard disk during the operation, and a task completion condition.

Optionally, the method further includes: providing an erasure configuration interface to the user; receiving a configuration option input by the user on the erasure configuration interface, and performing erasure control according to the information of the configuration option; the configuration option includes: In addition to the system hard drive, the model of the hard drive to be erased, and/or the erase mode.

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

Optionally, the method further includes: configuring, in the SAS control module, the SAS expander to be a multi-stage cascading mode; and expanding the number of the controlled hard disks and the parallelism by using the multi-level cascading multi-layer SAS expander.

Optionally, before the data write operation or after the read verify operation, the method further includes: according to the cascading manner of the multi-level cascaded multi-layer SAS expander, according to the first-level SAS from the highest-level SAS expander The order of the expanders sequentially activates the hard disks corresponding to the SAS expanders of each level.

Optionally, the method further includes: simulating a hard disk fault identification panel corresponding to the hard disk array layout; and using the hard disk fault identification panel to view the state of each hard disk and locate the hard disk with an abnormal state.

Optionally, the method controls one or more external disk cluster devices by using a SAS protocol, and writes the first type of data to the hard disk mounted by the disk cluster in parallel, thereby mounting the disk cluster device. The data of multiple hard disks is bulk erased.

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

According to an embodiment of another aspect of the present invention, a hard disk data erasing server is provided, the server comprising: a write operation control module, configured to send a data write command to the disk cluster device; The data write command controls to write the first type of data to the plurality of hard disks mounted by the disk cluster, thereby overwriting the original data.

Optionally, the method further includes: a read verification control module, configured to send a check read command to the disk cluster device, initiate a read verify operation; and hang from the disk cluster according to the check read command The plurality of hard disks are loaded in parallel to read data; and, whether the read data is the duplicate data or the random data, thereby completing the verification.

Optionally, the method further includes: a hard disk boot recognition module, configured to control a plurality of hard disks mounted on the disk cluster device, and determine whether there is an unrecognizable hard disk; and, for an unrecognized hard disk, issue heat Insert and remove instructions.

Optionally, the method further includes: an operation log module, configured to generate and save an operation log for each controlled hard disk, where the operation log records a command executed by the hard disk during the operation, and a task completion condition.

Optionally, the method further includes: an erasing configuration interface module, configured to provide an erasing configuration interface to the user; and receiving a configuration option input by the user on the erasing configuration interface, and erasing according to the information of the configuration option 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 mode.

Optionally, the method further includes: one or more SAS control modules respectively corresponding to the one or more disk cluster devices, configured to implement a magnetic field corresponding to the SAS control module by using a SAS expander The layout of the hard disk array of multiple hard disks mounted by the cluster device.

Optionally, the SAS control module is further configured to configure the SAS expander to be a multi-stage cascading mode, and expand the number of controlled hard disks and the parallelism by using a multi-level cascaded multi-layer SAS expander.

Optionally, the SAS control module is further configured to start according to the cascading manner of the multi-level cascaded multi-layer SAS expander according to the sequence from the highest-level SAS expander to the first-level SAS expander. The hard disk corresponding to each level of SAS expander.

Optionally, the method further includes: a hard disk fault identification panel module, configured to simulate a hard disk fault identification panel corresponding to the hard disk array layout; and, through the hard disk fault identification panel, view the state of each hard disk and locate the hard disk with an abnormal state.

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 by the disk clusters in parallel, thereby mounting the disk cluster devices. The data of multiple hard disks is bulk erased.

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

It can be seen that the present invention designs and constructs a set of parallel erasure suitable for the original data of the hard disk by applying the relatively stable SAS interconnection technology. This solution can be used for data erasing in data centers. The invention has the advantage of high parallelism. Through the SAS extension, nearly one thousand mechanical hard disks and solid state hard disks can be written in parallel, thereby realizing effective and fast erasing of data. Specifically, the SAS command is directly sent to the disk cluster device by the erasing server, and the erasing process is controlled by the SAS card, thereby avoiding I/O communication through the operating system and the disk during the erasing process, which greatly saves the economy. The system resources are also the embodiment of the high concurrency mentioned above.

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

Those skilled in the art will appreciate that although the following detailed description is made with reference to the illustrated embodiments and drawings, the invention is not limited to these embodiments. Rather, the scope of the invention is intended to be limited the scope of the invention

DRAWINGS

Other features, objects, and advantages of the present invention will become more apparent from the Detailed Description of Description

1 is a flow chart of a hard disk data erasing method according to an embodiment of the present invention;

2 is a schematic diagram showing the principle of writing data of a hard disk in a hard disk data erasing method according to an embodiment of the present invention;

3 is a schematic diagram of a top-level architecture of data erasing in a hard disk data erasing method according to an embodiment of the present invention;

4 is a schematic diagram of an extended manner of a SAS control module in a hard disk data erasing method according to an embodiment of the present invention;

5 is a schematic diagram of a process of starting an erase in a hard disk data erasing method according to an embodiment of the present invention;

6 is a schematic diagram of a shutdown erase process in a hard disk data erasing method according to an embodiment of the present invention;

7 is a schematic diagram of a hard disk fault identification panel in a hard disk data erasing method according to an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of a hard disk data erasing server according to an embodiment of the present invention.

Those of ordinary skill in the art will appreciate that although the following detailed description will be implemented with reference to the drawings The examples and the drawings are carried out, but the present invention is not limited to these embodiments. Rather, the scope of the invention is intended to be limited the scope of the invention

detailed description

Before discussing the exemplary embodiments in more detail, it should be noted that some exemplary embodiments are described as a process or method depicted as a flowchart. Although the flowcharts describe various operations as a sequential process, many of the operations can be implemented in parallel, concurrently or concurrently. In addition, the order of operations can be rearranged. The process may be terminated when its operation is completed, but may also have additional steps not included in the figures. The processing may correspond to methods, functions, procedures, subroutines, subroutines, and the like.

The computer device includes a user device and a network device. The user equipment includes, but is not limited to, a computer, a smart phone, a PDA, etc.; the network device includes but is not limited to a single network server, a server group composed of multiple network servers, or a cloud computing based computer Or a cloud composed of a network server, wherein cloud computing is a type of distributed computing, a super virtual computer composed of a group of loosely coupled computers. Wherein, the computer device can be operated separately to implement the present invention, and can also access the network and implement the present invention by interacting with other computer devices in the network. The network in which the computer device is located includes, but is not limited to, the Internet, a wide area network, a metropolitan area network, a local area network, a VPN network, and the like.

It should be noted that the user equipment, the network equipment, the network, and the like are merely examples, and other existing or future possible computer equipment or networks, such as those applicable to the present invention, are also included in the scope of the present invention. It is included here by reference.

The methods discussed below, some of which are illustrated by flowcharts, can be implemented in hardware, software, firmware, middleware, microcode, hardware description languages, or any combination thereof. When implemented in software, firmware, middleware or microcode, the program code or code segments to carry out 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 structural and functional details disclosed are merely representative and are for the purpose of describing exemplary embodiments of the invention. The present invention may, however, 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 the various elements, these elements should not be limited by these terms. These terms are used only to distinguish one unit from another. For example, a first unit could be termed a second unit, and similarly a second unit could be termed a first unit, without departing from the scope of the exemplary embodiments. The term "and/or" used herein includes any and all combinations of one or more of the associated listed items.

It will be understood that when a unit is referred to as "connected" or "coupled" to another unit, it can be directly connected or coupled to the other unit, or an intermediate unit can be present. In contrast, when a unit is referred to as being "directly connected" or "directly coupled" to another unit, there is no intermediate unit. Other words used to describe the relationship between the units should be interpreted in a similar manner (eg "between" and "directly between" and "adjacent to" Than "directly adjacent to", etc.).

The terminology used herein is for the purpose of describing the particular embodiments, The singular forms "a", "an", It is also to be understood that the terms "comprising" and """ Other features, integers, steps, operations, units, components, and/or combinations thereof.

It should also be noted that, in some alternative implementations, the functions/acts noted may occur in a different order than that illustrated in the drawings. For example, depending on the function/action involved, the two figures shown in succession may in fact be executed substantially simultaneously or sometimes Execute in 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 that combines the advantages of parallel SCSI and serial connection technologies. It uses a SCSI-3 extended instruction set and is compatible with SATA devices. It is a multi-level storage device. Connect to the protocol stack.

SAS Expander (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.

The smallest unit of disk file storage management is called "cluster", and a disk cluster device (JBOD device) is a storage device with multiple disk drives installed on one backplane.

The first type of data is used to cover the original data to implement data erasure, including but not limited to preset data, duplicate data, random data or template type data. For example, the repeated data may be all zero data, the random data is data automatically generated by the machine, the preset data is preset data, and the template data is data generated according to the preset template. The first type of data is generally meaningless data, as long as the original data is overwritten to achieve data erasure, and the specific form of the data is not limited.

The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings.

1 is a flow chart of a method for erasing hard disk data according to an embodiment of the present invention, which is used for bulk erasing data of a plurality of solid state hard disks or mechanical hard disks, wherein the erasing server passes SAS (Serial Attached SCSI, string) The Line Attached SCSI protocol controls one or more Just a Bunch Of Disks (JBOD) devices to bulk erase data from multiple hard disks mounted on a disk cluster device.

The method of this embodiment mainly includes the following steps:

S100. The erasing server controls a plurality of hard disks mounted on the disk cluster device, and determines whether there is an unrecognizable hard disk; and performs hot plugging for the unrecognized hard disk. Instructions for change;

S101. The erasing server sends a data write command to the disk cluster device, and writes the first type data to the plurality of hard disks mounted by the disk cluster in parallel through the data write command, thereby overwriting the original data;

S102. The erasing server sends a check read command to the disk cluster device to initiate a read verify operation. according to the check read command, data is read out from the plurality of hard disks mounted by the disk cluster in parallel; and the read data is determined. Whether it is the first type of data, thus completing the verification.

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

In this embodiment, the erasing server communicates with the disk cluster of the mounted hard disk through the SAS protocol, and performs data erasing operation on the hard disk mounted by the disk cluster. SAS is a disk connection technology that combines the advantages of parallel SCSI and serial connectivity technologies. It uses a SCSI-3 extended instruction set and is compatible with SATA devices. It is a multi-layer storage device connection protocol stack. Disk cluster (JBOD) devices are an important class of storage devices in the storage space. A JBOD device is a storage device with multiple disk drives mounted on a backplane. Also commonly known as Span. Unlike RAID arrays, JBOD has no front-end logic to manage the distribution of data on the disk. Instead, each disk is individually addressed as a separate storage resource, either as part of the host software or as an adapter card for the RAID group.

Specifically, the erasing server is responsible for the faulty hard disk identification (S100), initiating data writing to implement data erasure (S101), read verification (S102), and the like.

Step S100 is a preparation step of erasing data, mainly for checking whether all hard disks are started, determining whether there is a problem such as a fault of the hard disk, and being unrecognizable, and informing the engineer to perform hot swap replacement processing for the unrecognized hard disk. It can be understood that S100 is an optional preparation step, which is not necessary, that is, this step can be omitted.

Step S101 is a step of completing data erasing. 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 in parallel to the plurality of hard disks mounted by the disk cluster, thereby overwriting the original data. The first type of data here, for example, may 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 limited.

In order to implement write control of the first type of data to the hard disk, it can be implemented by setting a 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 erasure server (ie, each SAS control module controls one disk cluster device); in the SAS control module, through the SAS expander (SAS Expander) The hard disk array layout of multiple hard disks mounted by the corresponding disk cluster device is implemented. 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 SAS to a limited number of host ports. In the SAS domain, SAS Expander can serve as a central exchange and can directly connect to end devices.

In order to achieve the expansion of the number and parallelism of the controlled hard disks, a multi-level cascading manner of a multi-layer SAS expander can be adopted. For example, in the SAS control module, a multi-level cascading mode of a four-layer SAS expander is configured; and a multi-level cascading four-layer SAS expander is used to expand the number and parallelism of the controlled hard disks. In the multi-stage cascading mode in which the multi-layer SAS expander is adopted, before the data write operation or after the read verify operation, the order of starting the SAS expanders and the corresponding hard disks at each level is: multi-layer SAS according to multi-pole cascading The expansion mode of the expander sequentially starts the hard disks corresponding to the SAS expanders of all levels according to the order from the highest-level SAS expander to the first-stage SAS expander. For example, suppose a four-layer SAS expander is used: level1, level2, level3, level4, where level4 is the highest level, then the order of starting is the order of level4, level3, level2 to level1.

Step S102 is mainly to verify whether the written data is after the data erasing is completed. The first type of data is predefined. It can be seen that this step is mainly for determining the correctness of data erasure, and is an optional step, not an essential step.

Optionally, a hard disk fault identification panel (such as a software control interface) corresponding to the hard disk array layout may be simulated; the hard disk fault identification panel is used to view the status of each hard disk and locate the hard disk with abnormal status.

Optionally, an operation log may also be generated and saved for each controlled hard disk, and the operation log records commands executed by the hard disk during the operation, task completion, and the like.

Optionally, the user-defined erasure mode can also be supported, and the user can select an appropriate erasure mode according to his business scenario. Specifically, the user is provided with an erase configuration interface; receiving configuration options input by the user on the erase configuration interface, including: whether to erase the system hard disk, the model of the hard disk to be erased, and/or the erasing mode. .

The hard disk in the present invention includes, but is not limited to, a high-density storage device such as a mechanical hard disk or a solid state hard disk. For the sake of intuition, the embodiment of the method of the present invention will be described in detail below by taking a mechanical hard disk as an example.

The present invention writes multiple hard disks in parallel to cover existing content on the disk. Therefore, the selected fixed data mode, such as all zero mode or random number mode, changes the contents of the disk record to meaningless data. This action includes erasing all sectors of the hard disk to avoid any information leakage caused by content residue.

2 is a schematic diagram showing the principle of writing data of a hard disk in a hard disk data erasing method according to an embodiment of the present invention. As shown in FIG. 2, the disk surface is covered with a soft magnetic material, which can magnetize the storage medium particles into two different magnetic field directions of N->S or S->N, and respectively indicate that the recorded bit is 0 or 1. The magnetization process achieves magnetic fields in different directions by changing the direction of the current of the energized coil wound on the head in the figure. Therefore, the mechanical hard disk writes data to directly maintain or reverse the correct magnetization direction of the medium and directly overwrite 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 no real meaning According to, for example, all zero data or random data, it is equivalent to the original information can not be recovered. When all the sectors of the entire hard disk are rewritten, the hard disk can successfully declare that the data security requirements have been met, and there is no possibility of data leakage. The mechanical hard disk thus treated is equivalent to the entire disk being written once, and there is no bad damage to the hard disk itself, so that the usability can be maintained.

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

The data erasing top-level architecture provided by the present invention is mainly composed of two parts:

(1) Erasing server (head): The erasing server (head) is used as the originating end of data writing, the control end of the erasing operation, the verification management end, and the fault recording end. The invention can adopt only one physical server to realize simultaneous erasure and related work for nearly one thousand mechanical hard disks, and has high resource utilization efficiency.

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

In this example, two-way structure is installed, and two SAS cards (SAS control modules) are installed inside the erasing server to expand to each of the hard disks in the respective external JBOD devices. The SAS card is connected to the server CPU and memory system through the PCIe bus. The single-channel bandwidth is the PCIe bus bandwidth. For example, PCIe 3.0x 8 can achieve up to 8GB/sec bandwidth. For devices with low throughput such as mechanical hard disks, Effectively increase the degree of concurrency to write to a large number of hard disk devices at the same time.

Let's take a look at the SAS extension.

4 is a schematic diagram of an extended manner of a SAS control module in a hard disk data erasing method according to an embodiment of the present invention. Figure 4 shows the extended architecture of the present invention. For the sake of simplicity, A represents SAS expander A, B represents SAS expander B, and SAS expander B is below. Connected to multiple hard drives. With the SAS expander, the interconnect of the present invention continues to extend downward. A single SAS control module drives two paths in parallel, each of which is extended in four stages. SAS expander A has N-way SAS 3.0 channels, while SAS expander B has M-way SAS 3.0 channels, where N>M. Through the four-layer SAS expander cascading mode as shown in FIG. 4, the purpose is to increase the number of hard disks that can be connected, thereby increasing the degree of parallelism.

FIG. 5 is a schematic diagram of a process of starting an erase in a hard disk data erasing method according to an embodiment of the present invention. Includes the following steps:

S501: Start the highest level, that is, the fourth level (level 4) hard disk;

S502: Start a secondary advanced, that is, a third level (level 3) hard disk;

S503: Start a second-level (level 2) hard disk;

S504: Start a hard disk of a lowest level, that is, a first level (level 1);

S505: Start an erasure server;

S506: Write the first type of data in parallel to all visible hard disks.

Referring to FIG. 6, which is a schematic diagram of a shutdown erasure 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: Start the highest level, that is, the fourth level (level 4) hard disk;

S603: Start the secondary high level, that is, the third level (level 3) hard disk;

S604: Start a second level (level 2) hard disk;

S605: Start the lowest level, that is, the first level (level 1) hard disk;

S606: Start the erasing server.

In the implementation of the method, there are also the following aspects to be considered. After the plug-in JBOD device is turned on step by step and the wipe server is started, the first round will detect the unrecognized hard disk in the server. If any disk is inoperable, perform a hot swap replacement to begin writing data to overwrite the original information. The hot-swappable replacement hard disk will also be tested offline, and the calibration is not working properly. Bad disk. Since the write data is all 0 data, the write data is fixed, and therefore, the amount of user data transmission from the server is very low, and the main transmission information is control information such as metadata. Write data can be directly cached in the cache module inside the hard disk.

To ensure that all zero fields are successfully written to all sectors of the hard disk to overwrite existing content, a read verify operation can be performed after the data is written. Specifically, after the data is written, the server initiates a read data operation to directly check whether the data written to the sector is all zeros. The read check is performed synchronously with the write cover, and the two deliberately staggered a certain physical interval. Therefore, after the full disk is written, the read verification will also be completed in a short time. Both write and read check are performed in sequential and sequential read to maximize the throughput of the hard disk being operated, thereby reducing the time for data erasure.

In data erasure, an operation log can be generated at the erasure server for each erased hard disk. The operation log can record in detail the commands executed by the nearly one thousand hard disks in the respective erasures and the completion status of the tasks, and ensure that records are retained for each operation. The operation log record will be used in subsequent steps. For example, when the storage disk is taken out of the data center, combined with the serial number of each hard disk, the relevant operation log will be scanned to confirm that the hard disk has been Is 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, it can be observed through a hard disk fault recognition panel implemented by software. FIG. 7 is a schematic diagram of a hard disk fault 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. The hard disk is indicated by small dots. During the entire data erasure process, any abnormality that occurs on any hard disk at any time for any reason will be reflected through this panel. Based on clear instructions, the field engineer can quickly locate the faulty hard drive and replace it accordingly. The fault identification panel receives control signals transmitted from the SAS card and its various levels of SAS expanders and generates a corresponding dynamically updated user interface.

It can be seen that the present invention is designed and constructed by applying a relatively stable SAS interconnection technology. A set of parallel erasure schemes suitable for the original data of the hard disk. This solution can be used for data erasing in data centers. The invention has the advantage of high parallelism. Through the SAS extension, nearly one thousand mechanical hard disks and solid state hard disks can be written in parallel, thereby realizing effective and fast erasing of data. Specifically, the SAS command is directly sent to the disk cluster device by the erasing server, and the erasing process is controlled by the SAS card, thereby avoiding I/O communication through the operating system and the disk during the erasing process, which greatly saves the economy. The system resources are also the embodiment of the high concurrency mentioned above.

The invention has the characteristics of high concurrency and high efficiency, and can write nearly 1000 hard disks in parallel. At the same time, only one ordinary server is needed as the head, and the corresponding functions such as data writing, erasure verification, log analysis and bad disk recording can be completed. The overall investment is controllable, and non-destructive data destruction of nearly one thousand large-capacity hard disks can be completed in a short time. The so-called non-destructive means that the hard disk is non-destructive, and the data is permanently destroyed without any data fragments remaining. Compared with the existing permanent physical damage of the hard disk, the solution of the invention can ensure that the original data is effectively covered, so that the erased mechanical hard disk and the solid state hard disk can still be used.

The invention supports the user-defined erasing mode, and the user can select an erasing mode suitable for himself according to his own business scene, such as whether to erase the SDA system disk, the type of the erasing disk, and the erasing mode.

An embodiment of the present invention provides a server for hard disk data erasure corresponding to the foregoing method, which controls one or more external disk cluster devices by using a SAS protocol, thereby mounting a plurality of hard disks mounted on the disk cluster device. The data is bulk erased.

Referring to Figure 8, the server includes:

a write operation control module 801, configured to send a data write command to the disk cluster device to initiate a data write operation; and, by using the data write command, to control multiple hard disks mounted to the disk cluster in parallel Write the first type of data to overwrite the original data.

Optionally, the server further includes:

The read verification control module 802 is configured to send a verification read command to the disk cluster device. Initiating a read verify operation; reading data from the plurality of hard disks mounted by the disk cluster in parallel according to the check read command; and determining whether the read data is the first type of data, thereby Complete the verification.

Optionally, the server further includes:

The hard disk boot recognition module 803 is configured to control a plurality of hard disks mounted on the disk cluster device, and determine whether there is an unrecognizable hard disk; and, for an unrecognizable hard disk, issue an indication for performing hot plug replacement.

Optionally, the server further includes:

The operation log module 804 is configured to generate and save an operation log for each controlled hard disk, where the operation log records the command and task completion status of the hard disk being executed during the operation.

Optionally, the server further includes:

An erase configuration interface module 805, configured to provide an erase configuration interface to the user; and receive configuration options input by the user on the erase configuration interface, and perform erasure control according to the information of the configuration option; This includes: 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, configured to implement a hard disk array layout of multiple hard disks mounted by the disk cluster device corresponding to the SAS control module by using a SAS expander .

Optional,

The SAS control module 806 is further configured to configure the SAS expander to be a multi-stage cascading mode, and expand the number and parallelism of the controlled hard disks by using a multi-level cascaded multi-layer SAS expander.

Optional,

The SAS control module 806 is further configured to perform multi-layer SAS expansion according to the multi-pole cascade The cascading mode of the expander starts the hard disks corresponding to the SAS expanders of each level in sequence according to the order from the highest-level SAS expander to the first-stage SAS expander.

Optionally, the server further includes:

The fault identification module 807 is configured to simulate a hard disk fault identification panel corresponding to the hard disk array layout; and, through the hard disk fault identification panel, view the state of each hard disk and locate the hard disk with an abnormal state.

In addition, the present invention also provides a hard disk data erasing system, which includes the server and the disk cluster device described in FIG. 8, wherein the server controls one or more externally connected disk cluster devices through a SAS protocol, thereby Bulk erasing data of a plurality of hard disks mounted on the disk cluster device.

It should be noted that the present invention can be implemented in software and/or a combination of software and hardware, for example, using an application specific integrated circuit (ASIC), a general purpose computer, or any other similar hardware device. In one embodiment, the software program of the present invention may be executed by a processor to implement the steps or functions described above. Likewise, the software program (including related data structures) of the present invention can be stored in a computer readable recording medium such as a RAM memory, a magnetic or optical drive or a floppy disk and the like. Additionally, some of the steps or functions of the present invention may be implemented in hardware, for example, as a circuit that cooperates with a processor to perform various steps or functions.

Additionally, a portion of the invention can be applied as a computer program product, such as computer program instructions, which, when executed by a computer, can invoke or provide a method and/or solution in accordance with the present invention. The program instructions for invoking the method of the present invention may be stored in a fixed or removable recording medium and/or transmitted by a data stream in a broadcast or other signal bearing medium, and/or stored in a The working memory of the computer device in which the program instructions are run. Here, an embodiment in accordance with the present invention includes a device including a memory for storing computer program instructions and for performing the process A processor of a sequential instruction, wherein when the computer program instructions are executed by the processor, the apparatus is triggered to operate based on the methods and/or technical solutions described above in accordance with various embodiments of the present invention.

It is apparent to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, and the present invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the present embodiments are to be considered as illustrative and not restrictive, and the scope of the invention is defined by the appended claims instead All changes in the meaning and scope of equivalent elements are included in the present invention. Any reference signs in the claims should not be construed as limiting the claim. In addition, it is to be understood that the word "comprising" does not exclude other elements or steps. A plurality of units or devices recited in the system claims can also be implemented by a unit or device by software or hardware. The first, second, etc. words are used to denote names and do not denote any particular order.

Claims

A hard disk data erasing method, comprising:

Send a data write command to the disk cluster device;

Through the data write command, the first type of data is written to the hard disk mounted by the disk cluster, thereby overwriting the original data.
The method of claim 1 further comprising, after the data write operation, further comprising:

Sending a check read command to the disk cluster device;

And reading data from the plurality of hard disks mounted by the disk cluster in parallel according to the verify read command;

It is judged whether the read data is the repeated data or the random data, thereby completing the verification.
The method of claim 1 further comprising: before initiating a data write operation, further comprising:

Controlling to start multiple hard disks mounted on the disk cluster device, and determining whether there is an unrecognizable hard disk;

An instruction to perform a hot swap replacement is made for an unrecognized hard disk.
The method of claim 1 further comprising:

An operation log is generated and saved for each controlled hard disk, and the operation log records the command and task completion status that the hard disk is executed during the operation.
The method of claim 1 further comprising:

Providing the user with an erase configuration interface;

Receiving a configuration option input by the user on the erasure configuration interface, and performing erasure control according to the information of the configuration option; the configuration option includes: whether to erase the system hard disk, the model of the hard disk to be erased, and/or, Erase mode.
The method of any of claims 1-5, further comprising:

Setting one or more SAS control modules respectively corresponding to the one or more disk cluster devices;

In the SAS control module, the hard disk array layout of the plurality of hard disks mounted by the disk cluster device corresponding to the SAS control module is implemented by the SAS expander.
The method of claim 6 further comprising:

In the SAS control module, configuring the SAS expander to be a multi-stage cascading mode;

Extend the number and parallelism of the controlled hard disks through a multi-level cascaded multi-layer SAS expander.
The method according to claim 7, wherein before or after the data writing operation, the method further comprises:

According to the cascading manner of the multi-level cascaded multi-layer SAS expander, the hard disks corresponding to the SAS expanders of each level are sequentially activated according to the order from the highest-level SAS expander to the first-stage SAS expander.
The method of claim 6 further comprising:

Simulate a hard disk fault identification panel corresponding to the layout of the hard disk array;

Through the hard disk fault identification panel, view the status of each hard disk and locate the hard disk with abnormal status.
The method according to claim 1, wherein one or more external disk cluster devices are controlled by the SAS protocol, and the first type of data is written in parallel to the hard disk mounted by the disk cluster, thereby The data of multiple hard disks mounted on the cluster device is bulk erased.
The method according to claim 1, wherein the first type of data is preset data, duplicate data, random data or template type data.
A hard disk data erasing server, characterized in that the server comprises:

a write operation control module, configured to send a data write command to the disk cluster device; and, according to the data write command, control to write the first type of data to the plurality of hard disks mounted by the disk cluster, thereby overwriting the original There is data.
The server of claim 12, further comprising:

a read verification control module, configured to send a verify read command to the disk cluster device; and read data from the plurality of hard disks mounted by the disk cluster in parallel according to the check read command; and determine Whether the read data is the repeated data or random data, thereby completing the verification.
The server of claim 12, further comprising:

The hard disk boot recognition module is configured to control the booting of the plurality of hard disks mounted on the disk cluster device, and determine whether there is an unrecognizable hard disk; and, for the unrecognized hard disk, issue an indication for performing hot plug replacement.
The server of claim 12, further comprising:

An operation log module is configured to generate and save an operation log for each controlled hard disk, where the operation log records a command executed by the hard disk during the operation, and a task completion condition.
The server of claim 12, further comprising:

An erase configuration interface module, configured to provide an erase configuration interface to the user; and receive configuration options input by the user on the erase configuration interface, and perform erasure control according to the information of the configuration option; the configuration option includes : Whether to erase the system hard disk, the model of the hard disk to be erased, and / or erase mode.
The server according to any one of claims 12 to 16, further comprising:

The one or more SAS control modules respectively corresponding to the one or more disk cluster devices are configured to implement a hard disk array layout of the plurality of hard disks mounted by the disk cluster device corresponding to the SAS control module by using the SAS expander.
The server of claim 17 wherein:

The SAS control module is further configured to configure the SAS expander to be a multi-stage cascading mode, and expand the number of controlled hard disks and the degree of parallelism by multi-level cascading multi-layer SAS expanders.
The server of claim 18, wherein:

The SAS control module is further configured to be used according to the multi-pole cascaded multi-layer SAS expander In the cascading mode, the hard disks corresponding to the SAS expanders of each level are sequentially activated according to the order from the highest-level SAS expander to the first-stage SAS expander.
The server according to claim 17, further comprising:

The fault identification module is configured to simulate a hard disk fault identification panel corresponding to the hard disk array layout; and, through the hard disk fault identification panel, view the state of each hard disk and locate the hard disk with an abnormal state.
The server according to claim 12, wherein the server controls one or more external disk cluster devices through the SAS protocol, and writes the first type data to the hard disks mounted by the disk clusters in parallel, thereby The data of the plurality of hard disks mounted on the disk cluster device is bulk erased.
The server according to claim 12, wherein the first type of data is preset data, duplicate data, random data, or template type data.
A hard disk data erasing system, comprising: a disk cluster device and the server of any one of claims 12-22.