CN103986757A - Distributed backup method and system of block storage videos - Google Patents
Distributed backup method and system of block storage videos Download PDFInfo
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Abstract
The invention provides a distributed backup system of block storage videos. The system comprises a backup management server, a first IPSAN device and a second IPSAN device. Videos to be backed up are stored in the first IPSAN device, and the second IPSAN device is used for backing up the videos. When a video data backup service is carried out, the BM server sends backup service signals to the first IPSAN device and the second IPSAN device; the corresponding video data are read out through the first IPSAN device according to the backup service signals and sent to the second IPSAN device; the video data are received by the second IPSAN device and backed up in the storage space of the second IPSAN device. According to the backup scheme, a centralized architecture that data are totally processed by the BM server is optimized into a full distributed architecture that backup service signal processing is carried out by the BM server and the media data are processed through the IPSAN device where the videos are located and the backup IPSAN device, so that pressure of the BM server is relieved.
Description
Technical field
The present invention relates to technical field of memory, relate in particular to the distributed backup method and system of a kind of storage video recording.
Background technology
Along with the application of high definition in monitoring business system, to the reliability of monitoring video storage, performance etc., require more and more higher.And front end IP encoder device to the iSCSI of Media Stream end to end of IPSAN directly the technology of depositing be exactly a kind of good video recording storage scheme.On storage mode, the data management mode of " Media Stream piece is directly deposited " has been abandoned media server.On the basis of IP network, integrated iSCSI module in encoding device, can write video recording data in IPSAN memory device based on iSCSI agreement encoding device, please refer to the drawing 1 end to end.
When the image of control point need to carry out centralized stores, front end IP encoder is set up iSCSI with IPSAN equipment and is connected, the storage resources of IPSAN equipment is mounted to this locality by iSCSI agreement, then store video stream is carried out to iSCSI protocol encapsulation, adopt proprietary piece storage format that media and time index data are write in IPSAN memory device.
Fig. 2 has provided a kind of general monitoring video piece storage format.The chief component of this block format is as follows:
(1) superblock: generally have tens K (such as 16K) byte, be used for version number, the video camera coding of record block form;
(2) one-level time index district: be one-level time index district after superblock, every time index in index area is corresponding one by one with a data cell, for recording the time of the frame of the I the earliest group of this data cell, thereby can navigate to fast certain data cell based on the time;
(3) data cell and secondary time index district: after one-level time index district, be a series of data cell, for preserving the I frame group data of video recording.In order to guarantee writing continuously of I frame group data, data cell generally reaches hundreds of M byte (such as 256M byte).Each data cell starts with a secondary time index district, and wherein every time index Xiang Yuyi I frame group is corresponding one by one, for recording the time started of this I frame group, thereby can locate fast certain I frame group based on the time.After secondary index district, be exactly all I frame group data in notebook data unit;
(4) I frame group: I frame group is exactly the monitoring video data of 1 second.In I frame group, storage be all videos, the packets of audio data of this I frame group.
For block format, record a video, in the sector applications such as public security, garden, there is following video recording backup requirements: the video recording of some material time sections of selecting for user (such as: the video camera that public security important case relates to correlation time section video recording), need to carry out backup, be about to this part video recording data from original memory space, transmit and store the memory space that is exclusively used in backup into, it is generally longer that the phase is retained in the video recording in backup space, and supported data copies the fault tolerant mechanism of many parts simultaneously.
Video recording backup traffic feature comprises:
1, obtain as required storage video recording.By the BACKUP TIME section of user's appointment, be converted to the space address scope of original video recording, the distribution space of this scope directly depends on the preservation form of original video recording;
2, the memory space of preserving backup video recording is not fixed, and cannot specify in advance, can only specify a public memory space, can preserve the backup video recording of a lot of video cameras.That is to say, the common mode based on disk mirroring is in video recording backup field inapplicable.Therefore, back up memory space generally can be formatted as file system, thereby the memory space of realizing the important video recording of multiple-camera backup shares.
Existing a kind of generic block video recording backup scenario, networking as shown in Figure 3.In this backup networking plan, VM server is issued to BM server by backup tasks, and BM server, by RTSP agreement, is downloaded the video recording data of specifying video camera, fixed time section to the DM server request of management video recording place IPSAN equipment.
After DM server is received request, by iSCSI agreement, read corresponding block format video recording data from be mounted to local IPSAN storage resources, the data channel of then setting up by RTSP, sends to BM server by video recording data.
BM server creates file after receiving video recording data in resource backup, and data are write in backup file.
Such scheme, because the RTSP download performance of DM server is limited, downloading the requirement that does not reach backup in code stream bandwidth far away, so industry has been released again a kind of new backup scenario, please refer to the drawing 4.In this scheme, BM server arrives local by the resource backup of iSCSI agreement carry backup IPSAN on the one hand, storage resources by iSCSI agreement carry video recording place IPSAN arrives local simultaneously, BM server is in video recording backup flow process like this, no longer need to DM server, to download video recording by RTSP, but directly local at BM server, the block format reading in storage resources by iSCSI agreement is recorded a video, and pass through iSCSI agreement in the mode of backup file, video recording data are write to resource backup.
Because this scheme has reduced BM server, to DM server, by RTSP, download the middle low performance link of video recording, so backup performance is by the lifting obtaining to a certain extent.But the handling property of BM server easily becomes performance bottleneck, make the monolithic backup Performance Ratio of system lower.
In addition, BM server generally adopts linux operating system, has the different running environment of kernel state, user's state under linux system.In kernel state running environment, carry out system-level tasks such as interrupting processing, task scheduling, file system, ICP/IP protocol stack; In user's state running environment, carry out user-defined task.
Address space in above-mentioned two operational environments is isolated completely, when data are transmitted in two environment, need to, from the address space of source environment, copy the address space of object environment to.
For above-mentioned backup scenario, the iSCSI protocol stack that BM server is used is the kernel state that is operated in linux system, and backup module is to be operated in user's state.Therefore, when video recording data are read backup module and are written to resource backup from backup module by iSCSI agreement by iSCSI agreement from storage resources, need between the kernel state of BM server and user's state, carry out two secondary data copies, affect largely backup performance.
Summary of the invention
In view of this, the invention provides the distributed backup system of a kind of storage video recording.
This system comprises archive management server BM, the one IPSAN equipment and the 2nd IPSAN equipment, the one IPSAN device storage has video recording to be backed up, the 2nd IPSAN equipment is used for backing up video recording, when recording a video data backup business, this BM server sends backup traffic signaling to an IPSAN equipment and the 2nd IPSAN equipment; The one IPSAN equipment by corresponding video recording data reading, and is sent to the 2nd IPSAN equipment according to described backup traffic signaling; The 2nd IPSAN equipment receives described video recording data, and backup is at the memory space of self.
Preferably, described backup traffic signaling is carried out by user's state backup module of BM server; The reading, send by the kernel state backup module of an IPSAN equipment and carry out of described video recording data; The reception of described video recording data, backup are carried out by the kernel backup module of the 2nd IPSAN equipment.
Preferably, BM server is in being mounted to the resource backup of the 2nd local IPSAN equipment, in the mode of preassignment continuous space, according to the length of video recording data, adjust file system interface to create new file, and obtain newly creating initial address, the length of file in resource backup.
Preferably, the described backup traffic signaling sending to an IPSAN equipment comprises: backup request message; This backup request message comprises: backup video recording data at the stored position information of an IPSAN equipment, the IP address of the 2nd IPSAN equipment and listening port, backup video recording data at the stored position information of the 2nd IPSAN equipment.
Preferably, the kernel state backup module of the one IPSAN equipment after receiving backup request message based on backup video recording data the stored position information at an IPSAN equipment, structure is read IO order and is read backup video recording data, and the SOCKET by kernel state TCP transmission mode sends the backup data message of recording a video to the kernel state backup module of the 2nd IPSAN equipment by these backup video recording data.
Preferably, the kernel state backup module of an IPSAN equipment, after receiving backup request message, creates the backup thread of kernel state; When starting to carry out the backup of epicycle video recording data, the recording start time of implementation; The epicycle backup sending at the kernel state backup module of receiving the 2nd IPSAN equipment is recorded the current time after successfully replying; According to described Starting Executing Time and current time, obtain the time that epicycle Backup Data is processed; If the epicycle Backup Data processing time is less than t, described backup thread carries out dormancy, and dormancy time is the difference in t and epicycle Backup Data processing time; Described t is the ratio of epicycle Backup Data length and backup rate; After dormancy completes, start the backup of next round video recording Backup Data.
Preferably, when carrying out the backup of a plurality of video recording data, when if backup rate need to regulate, BM server sends backup rate adjusting message to the kernel backup module of the IPSAN equipment at video recording place, carries the backup rate after backup tasks ID to be regulated, adjusting in message; The kernel backup module of the IPSAN equipment at video recording place is received after message, revises the dormancy time of corresponding backup thread.
Preferably, carrying out backup rate while regulating, according to the backup rate of current video recording is reduced to a speed, regulate unit, and adjustable range few principle of trying one's best is carried out.
Compared to prior art, the centralized architecture of backup scenario of the present invention from all being processed by archive management server, be optimized for BM server and carry out the processing of backup traffic signaling, the full distributed framework of video recording place IPSAN equipment and backup IPSAN device processes media data, has alleviated the pressure of archive management server.All media datas of backup are processed, user's state resume module from archive management server, the kernel state backup module being optimized between IPSAN equipment is processed, avoid media stream data in the kernel state of archive management server and the repeatedly copy process between user's state, effectively improved backup performance.
Accompanying drawing explanation
Fig. 1 records a video directly to deposit schematic diagram.
Fig. 2 is video recording piece storage format figure.
Fig. 3 is existing a kind of video recording backup figure.
Fig. 4 is existing another kind of video recording backup figure.
Fig. 5 is embodiment of the present invention video recording distributed backup system diagram.
Fig. 6 is embodiment of the present invention video recording distributed backup flow chart.
Embodiment
Problem based on mentioning in background technology, the invention provides the backup scenario of following video recording data:
When recording a video data backup business, BM server sends backup traffic signaling to video recording place IPSAN equipment and backup IPSAN equipment;
Video recording place IPSAN equipment by corresponding video recording data reading, and is sent to backup IPSAN equipment according to described backup traffic signaling;
Backup IPSAN equipment receives described video recording data, and backup is at the memory space of self.
The centralized architecture of backup scenario of the present invention from all being processed by archive management server, be optimized for BM server and carry out the processing of backup traffic signaling, the full distributed framework of video recording place IPSAN equipment and backup IPSAN device processes media data, has alleviated the pressure of archive management server.
Wherein, BM server comprises user's state backup module, and backup traffic signaling is carried out by user's state backup module of BM server; The IPSAN equipment at video recording place and backup IPSAN equipment comprise respectively kernel state backup module, the reading of described video recording data, send by the kernel state backup module of the IPSAN equipment at video recording place and carry out; The reception of described video recording data, backup are carried out by the kernel state backup module of backup IPSAN equipment.
All media datas of backup are processed, user's state resume module from archive management server, the kernel state backup module being optimized between IPSAN equipment is processed, avoid media stream data in the kernel state of archive management server and the repeatedly copy process between user's state, effectively improved backup performance.
Below in conjunction with Fig. 5 and Fig. 6, describe an embodiment who implements the technology of the present invention in detail.
Fig. 5 has provided the system architecture diagram of a kind of storage video recording distributed backup.The system of this piece storage video recording distributed backup comprises: BM server, the IPSAN equipment at video recording place, backup IPSAN equipment, VM server (the video management server in supervisory control system, can manage concentratedly and control supervisory control system all devices, dispatch various video monitoring services, and management distributes supervisory user authority), DM server (the data management server in supervisory control system, can manage the storage resources of all front ends of supervisory control system concentratedly, storage data), BM server comprises user's state backup module, the IPSAN equipment at video recording place comprises kernel state backup module, backup IPSAN equipment also comprises kernel state backup module.
Fig. 6 has provided the operating process that each equipment in said system is carried out when recording a video backup.
F1. user, by UI interface, issues backup tasks to VM, carries the information of video camera name, video time section.
After F2.VM server is received the backup request at UI interface, to DM server, send a request message, the corresponding video camera of acquisition request is the data unit information (in this example, the storage organization of media data adopts the structure shown in Fig. 2) in section at the appointed time, in request message, carry video camera name, BACKUP TIME segment information.
After F3.DM server is received request message, that reads this video camera is mounted to local storage resources, obtain all data cells of " time started of this BACKUP TIME of video recording time started <=section, the end time of this BACKUP TIME of video recording end time >=section ".DM server, by response message, returns to following information to VM server: the information of the block device path of storage resources, data cell sum, each data cell (unit initial address, unit size, video recording time started, video recording end time).
F4.VM server creates new backup tasks, and task status is set to back up, and is recorded in the backup tasks table of VM database, and gets the backup tasks ID of new database record.VM server issues backup tasks initiate notification message to BM server.In message, carry following information:
The IP address of video recording place IPSAN equipment, backup listening port;
The IP address of backup IPSAN equipment, backup listening port;
Backup tasks ID, backup rate;
The concrete stored position information of recording a video; It comprises: the data cell sum of storage resources path, this backup tasks, the information of each data cell, the information of each data cell comprises initial address and the data length of data cell.
Above-mentioned steps F1～F4 requires the time period information of the video recording of backup for user, by DM server being mounted on local storage resources (the IPSAN equipment at video recording place by the storage resources of self in advance carry on DM server) search, obtain the stored position information of backup video recording.VM issues the notice of the backup of recording a video to BM server.The notice of BM server based on VM starts the backup of video recording.It should be noted that, in the present embodiment, the IPSAN equipment at video recording place is to store video recording data with the form of Fig. 2, and a backup tasks can comprise the backup of the data of several data cells.
After F5.BM startup of server video recording backup, first in internal memory, create backup tasks controll block, all information in recording messages, then to the data cell in backup tasks, data cell is carried out back-up processing one by one.
Take below and back up a data cell and describe as example.
F6.BM server is in being mounted to local resource backup, mode with preassignment continuous space, according to the length of the data cell when pre-treatment, adjust file system interface to create new file, and return to initial address, the length of new establishment file in resource backup.
F7.BM server sends backup request message to the kernel backup module of video recording place IPSAN, in message, carries:
The positional information of current data unit: the address of storage resources path, data cell, data length;
IP address, the listening port of backup IPSAN equipment;
The destination locations information of backup: resource backup path, initial address, length;
Backup tasks ID, backup rate;
F8. the record a video kernel backup module of place IPSAN, after receiving the backup request message of BM server:
In internal memory, create backup tasks controll block, record all information in backup request message.Meanwhile, in controll block, by reduced data side-play amount offset value initialization, be 0;
In the timestamp member of backup tasks controll block, take millisecond as precision, record current time;
The backup thread that creates kernel state, is exclusively used in the backup of this backup tasks;
Address based on storage resources path, data cell, data length, the maximum data of side-play amount offset, the support of this equipment reads length (such as 512K byte), and structure is read IO, from disk assigned address, reads and specifies big or small data.
F9. kernel state transfer of data
The kernel backup module of video recording place IPSAN is after the success of disk reading out data, by the socket of kernel state tcp transmission mode, to the kernel backup module transmission transfer of data message of object IPSAN.
Message format is defined as follows:
Head part: backup tasks ID, resource backup path, backup file initial address, backup file length, notebook data side-play amount offset, the notebook data length in backup file;
Body part: the data that read from disk;
If message send unsuccessfully (such as network disconnect or object IPSAN not online) or object IPSAN answer failed, discharge backup tasks controll block, backup thread, to BM server, send message, notify this backup failure, and return to failure cause.
F10. after the kernel backup module that backs up IPSAN is received message, based on backup tasks ID, mate corresponding backup tasks controll block: if matched, judge data offset offset in Standby control piece, whether consistent with the side-play amount offset carrying in message, if inconsistent, dropping packets.If coupling less than: message is the first packet (data offset is hereof 0) of this backup, creates backup tasks controll block, the information of recorded message head part.
According to the data division in message, structure is write IO, writes the logical DOS drives of object resource, initial address+notebook data offset that address is backup file, and data writing is the body part in message; Data are upgraded the data offset in Standby control piece: this data length of data offset+=after writing disk success.If data offset equals backup file length, illustrate that whole backup file has completed backup, discharges backup tasks controll block.
To video recording place IPSAN, send and reply successfully message, in message, carry the information such as backup tasks ID, data writing offset.
F11., after the place IPSAN that records a video receives and replys successfully message, the backup tasks ID based on carrying in message, searches corresponding backup tasks controll block;
After the success of coupling backup tasks controll block, in backup tasks controll block, the data writing offset based in message, the cumulative offset that has sent data;
And further carry out following flow-control mechanism:
Obtain the time of this data processing: the timestamp recording in this data processing time=current time (millisecond precision)-Standby control piece;
Based on backup rate and each data volume that sends, calculate time interval value: such as the backup rate of this backup tasks is 8M bit/ second, and process 512K byte data, the cycle time of a data processing, value was 500ms at every turn.Other backup rate, by that analogy;
If the time of this data processing is less than time interval value, calculate dormancy time:
The time of dormancy time=time interval value-this data processing;
Backup thread to this backup tasks, according to the dormancy time execution thread dormancy calculating.
After thread dormancy completes, start that the data that next maximum data reads length (such as 512K byte) read, transfer process;
F12., after completing the backup of a data cell, place IPSAN is after the backup that completes this data cell in video recording, discharges backup tasks controll block, backup thread.
Video recording place IPSAN sends notice message to BM server, carries backup tasks ID, data cell region, the success of notice notebook data unit backup.
F13.BM server receiving that data cell has backed up after notice, judges in corresponding backup tasks whether have not yet other data cells of backup, if existence,, as step F 6～F12 carries out the backup of next data cell.If all data cells of backup tasks have completed backup, BM server sends a notification message to VM server, carries backup tasks ID, notifies this backup tasks to complete.
F14.VM server is after the backup tasks of receiving BM server completes notification message, this backup file information (video camera coding, backup video recording time started, backup video recording end time) is write to the backup file table of VM database, and the state that upgrades corresponding backup tasks is for completing backup.
Above flow process is described the process of video recording data backup in detail.If have multichannel video recording data to need backup, may occur the situation of IPSAN equipment code stream bandwidth deficiency simultaneously.So the present invention further provides a kind of video recording backup distributed system with backup rate managerial ability.
The backup rate management of native system, has considered total code stream bandwidth of IPSAN equipment, the lowest-bandwidth demand of single channel backup, according to the maximum support backup way of video recording place IPSAN equipment, backup IPSAN equipment, manages.
For video recording place IPSAN equipment, consider that storing IP SAN also writes carrying out new video recording, so specification suitably turns down, such as 512Mbit/ total bandwidth second, in the situation that the lowest-bandwidth of single channel backup is 4Mbit/ second, can support 128 tunnels backups.
The total capacity of backup IPSAN equipment, specification can support the total bandwidth writing to specify according to IPSAN, such as 2048Mbit/ total bandwidth second, in the situation that the lowest-bandwidth of single channel backup is 4Mbit/ second, can support 512 tunnel backups.
In the situation that backing up way and reaching above-mentioned specification, new backup tasks will the queue to be backed up such as be suspended to.Follow-up have after backup tasks completes, then it is dispatched.
The backup rate of each backup tasks, usings and 4Mbit/ second regulates unit as one, the highest 32Mbit/ second, minimum 4Mbit/ second.
The backup rate of new backup tasks is from the highest 32Mbit/ second, until the remaining bandwidth of video recording place IPSAN can not satisfy the demands.
In the situation that remaining bandwidth can not meet the demands, the principle according to " regulon of backup rate reduction of existing task and adjustable range is as far as possible few ", regulates the backup rate of existing task.Such as: the backup rate of the backup tasks on 16 tunnels above, is all set to 32Mbit/ second.When processing 17 road backup tasks, by the backup rate of 13Dao 16 road backup tasks, from 32Mbit/, be adjusted to 28Mbit/ second second.When processing 18 road backup tasks, by the backup rate of the 9th Dao12 road backup tasks, from 32Mbit/, be adjusted to 28Mbit/ second second.By that analogy, until maximum 128 road backup tasks, the backup rate of all backup tasks is all set to 4Mbit/ second.Implementing procedure is as follows:
In the situation that needs are carried out backup rate dynamic adjustments, VM server sends backup rate to corresponding BM server and regulates message, in message, carry address, the listening port of the video recording place IPSAN equipment that needs adjusting, the backup rate after backup tasks ID, adjusting.
After BM server is received backup rate adjusting command, the kernel backup module transmission backup rate adjusting message to corresponding IPSAN equipment, carries in message and needs the backup tasks of adjusting sum, the backup rate after all backup tasks ID to be regulated, adjusting.
The kernel backup module of IPSAN equipment receives that, after message, backup tasks is processed one by one.
Based on backup tasks ID, find Standby control piece, revise the dormancy time of corresponding backup thread.
Based on above-mentioned mechanism, realized the dynamic adjustments to the backup rate of all backup tasks of system.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of making, be equal to replacement, improvement etc., within all should being included in the scope of protection of the invention.
Claims (8)
1. a piece is stored the distributed backup system of recording a video, this system comprises archive management server BM, an IPSAN equipment and the 2nd IPSAN equipment, and an IPSAN device storage has video recording to be backed up, the 2nd IPSAN equipment is used for backing up video recording, it is characterized in that:
When recording a video data backup business, this BM server sends backup traffic signaling to an IPSAN equipment and the 2nd IPSAN equipment;
The one IPSAN equipment by corresponding video recording data reading, and is sent to the 2nd IPSAN equipment according to described backup traffic signaling;
The 2nd IPSAN equipment receives described video recording data, and backup is at the memory space of self.
2. the system as claimed in claim 1, is characterized in that, described backup traffic signaling is carried out by user's state backup module of BM server; The reading, send by the kernel state backup module of an IPSAN equipment and carry out of described video recording data; The reception of described video recording data, backup are carried out by the kernel backup module of the 2nd IPSAN equipment.
3. system as claimed in claim 2, it is characterized in that, BM server is in being mounted to the resource backup of the 2nd local IPSAN equipment, mode with preassignment continuous space, according to the length of video recording data, adjust file system interface to create new file, and obtain newly creating initial address, the length of file in resource backup.
4. system as claimed in claim 2, is characterized in that, the described backup traffic signaling sending to an IPSAN equipment comprises: backup request message; This backup request message comprises: backup video recording data at the stored position information of an IPSAN equipment, the IP address of the 2nd IPSAN equipment and listening port, backup video recording data at the stored position information of the 2nd IPSAN equipment.
5. system as claimed in claim 3, it is characterized in that, the kernel state backup module of the one IPSAN equipment after receiving backup request message based on backup video recording data the stored position information at an IPSAN equipment, structure is read IO order and is read backup video recording data, and the SOCKET by kernel state TCP transmission mode sends the backup data message of recording a video to the kernel state backup module of the 2nd IPSAN equipment by these backup video recording data.
6. system as claimed in claim 4, is characterized in that, the kernel state backup module of an IPSAN equipment, after receiving backup request message, creates the backup thread of kernel state; When starting to carry out the backup of epicycle video recording data, the recording start time of implementation; The epicycle backup sending at the kernel state backup module of receiving the 2nd IPSAN equipment is recorded the current time after successfully replying; According to described Starting Executing Time and current time, obtain the time that epicycle Backup Data is processed; If the epicycle Backup Data processing time is less than t, described backup thread carries out dormancy, and dormancy time is the difference in t and epicycle Backup Data processing time; Described t is the ratio of epicycle Backup Data length and backup rate; After dormancy completes, start the backup of next round video recording Backup Data.
7. system as claimed in claim 2, it is characterized in that, when carrying out the backup of a plurality of video recording data, when if backup rate need to regulate, BM server sends backup rate adjusting message to the kernel backup module of the IPSAN equipment at video recording place, carries the backup rate after backup tasks ID to be regulated, adjusting in message; The kernel backup module of the IPSAN equipment at video recording place is received after message, revises the dormancy time of corresponding backup thread.
8. system as claimed in claim 7, is characterized in that, carrying out backup rate while regulating, according to the backup rate of current video recording is reduced to a speed, regulates unit, and adjustable range few principle of trying one's best is carried out.
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| CN107483893A (en) * | 2017-09-08 | 2017-12-15 | 中国地质大学（武汉） | The multi-point cooperative renewal storage method and system of a kind of smart city video data |
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| CN115329391B (en) * | 2022-10-18 | 2023-01-24 | 成都卫士通信息产业股份有限公司 | Text database protection method, device, equipment and medium |
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