CN101968722A - Flash memory based magnetic tape simulation method - Google Patents
Flash memory based magnetic tape simulation method Download PDFInfo
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- CN101968722A CN101968722A CN 201010294116 CN201010294116A CN101968722A CN 101968722 A CN101968722 A CN 101968722A CN 201010294116 CN201010294116 CN 201010294116 CN 201010294116 A CN201010294116 A CN 201010294116A CN 101968722 A CN101968722 A CN 101968722A
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Abstract
The invention relates to a flash memory based magnetic tape simulation method which comprises a flash memory based magnetic tape simulation data writing in method and a flash memory based magnetic tape simulation reading method, wherein the flash memory based magnetic tape simulation data writing in method comprises the following steps of: (1) loading a magnetic tape; (2) setting the offset of writing in data; and (3) writing data into the flash memory in a virtual magnetic tape form; the flash memory based magnetic tape simulation reading method comprises the following steps of: (1) loading a magnetic tape; (2) setting the offset of read data; and (3) reading data from the flash memory in a virtual magnetic tape form. In the invention, the flash memory is simulated into a magnetic tape capable of being off line and is read out from another virtual magnetic tape device, thereby the data safety is improved, the use of a user is facilitated, the flash memory property is improved, the service life of the flash memory is prolonged, and the application range of the flash memory is expanded.
Description
Technical field
The invention belongs to areas of information technology, especially a kind of tape emulation mode based on flash memory.
Background technology
Along with the widespread use of computer system, the user seems more and more important to the protection of computer data.At present, the main means of protected data safety are that data are carried out schedule backup and filing.In the selection of backup and archival device, the user can select tape-shaped medium's (magnetic tape station, tape library) usually in a very long time in the past.Along with the develop rapidly of disk technology and the reduction day by day of the IT of enterprise O﹠M budget, the VTL technology is arisen at the historic moment.
Traditional VTL is to utilize the VTL technology, with disk array emulation is the physical tape storehouse/tape drive of industry standard, thereby need not to change on the basis of existing tape backup software, improving access speed, reliability and the availability of medium.The shortcoming of this technology is: the data that backup in the VTL need mobile whole magnetic disk array, and disk array is the hardware device of 1U, a 2U even several U, and are mobile very inconvenient, cause the limitation of data filing, exchanges data.
At present, flash memory (Flash Memory) can be simulated as disk, it is used as hard disk, disk array, the problem that this emulation technology exists: for the particularly operation of large amount of small documents of operation of file, the increase of file, deletion, retouching operation are many, therefore become the flash memory of hard disk, disk array to read and write repeatedly often to emulation, frequent to the write operation of flash memory.For database manipulation and Yan Yeshi, the increase of data-base recording, deletion, retouching operation are more frequent, therefore also many to the write operation of flash memory.And the basic unit of storage of flash memory is a page or leaf, and is that unit carries out erase operation with the piece.The write operation of flash memory must be carried out at white space, if there have been data the target area, must wipe afterwards earlier and write, so erase operation is the basic operation of flash memory.Operation for large amount of small documents, this frequent small data quantity of database, that just may cause: on the one hand whole flash memory space is not effectively used in the frequent read-write of certain some piece, make the service efficiency of whole flash memory low, on the other hand a certain is write once to count equally and used once, the flash memory whole service life reduces under same access times restriction.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of tape emulation mode based on flash memory is provided, this tape emulation mode can become flash memory emulation the tape of can off-line preserving, can extract off-line at any time preserves and reads on other virtual tape device, both guaranteed the safety of data, convenient for users to use again.
The present invention solves existing technical matters and takes following technical scheme to realize:
A kind of tape emulation mode based on flash memory comprises that tape emulated data based on flash memory writes disposal route and based on the tape emulated data reading and processing method of flash memory, wherein:
Writing disposal route based on the tape emulated data of flash memory comprises the steps:
Step 1: the step of loading tape;
Step 2: set the step that writes data offset;
Step 3: the step that writes data with the virtual tape form to flash memory;
Tape emulated data reading and processing method based on flash memory comprises the steps:
Step 1: the step of loading tape;
Step 2: the step of setting the reading of data side-play amount;
Step 3: with the step of virtual tape form reading of data from flash memory.
And the step of described loading tape comprises following processing procedure:
(1) application module sends SCSI through the external interface module to the tape library simulation management module and loads the tape order;
(2) the tape library simulation management module checks that the Drive Status luggage of going forward side by side carries tape and handles;
(3) the tape library simulation management module is returned the tape loading condition through the external interface module to application module.
And the step that described setting writes data offset comprises following processing procedure:
(1) application module sends the SCSI write command to the external interface module;
(2) the external interface module settings writes data offset and sends the memory access control module to;
The position of (3) memory access control module visit flash memory specific data side-play amount;
(4) memory access control module is returned the data offset state that writes of setting through the external interface module to application module.
And, describedly comprise following processing procedure to the step that flash memory writes data with the virtual tape form:
(1) application module sends to the memory access control module through the external interface module and writes data command;
(2) emulate tapes storage pool module writes data to the amount of the specifying Offsets position of flash memory;
(3) memory access control module is returned to application module through the external interface module and is write data mode.
And described emulate tapes storage pool module comprises the steps: to the process that the amount of the specifying Offsets position of flash memory writes data
1. emulate tapes storage pool module judges whether flash memory formats, if not format then will flash memory enter next step after the format;
2. detect and to read the sequence number of flash memory, if can not read then carry out error handling processing;
3. read the sequence number and the capacity of flash memory,, obtain the capacity of tape according to the setting of tape library simulation management module the sequence number of flash memory bar code as tape;
4. judge whether GB on Tape satisfies data and write, if capacity inadequately then carry out error handling processing;
5. by the magnetic tape format record data;
6. read last piece number of record data;
7. from next BOB(beginning of block) record data;
Equal record data set metadata in the leader tape head index part in flash memory when 8. at every turn carrying out write operation;
9. the data endpoint that in tape, writes of record data and this takes the lead index part record metadata in flash memory;
10. notifying the memory access control module to write finishes.
And the step of described setting reading of data side-play amount comprises following processing procedure:
(1) application module sends the SCSI reading order to the external interface module;
(2) external interface module settings reading of data side-play amount and send the memory access control module to;
The position of (3) memory access control module visit flash memory specific data side-play amount;
(4) memory access control module is returned the reading of data side-play amount state of setting through the external interface module to application module.
And, describedly comprise following processing procedure with virtual tape form step of reading of data from flash memory:
(1) application module sends the reading of data order through the external interface module to the memory access control module;
(2) the specific data offset location reading of data of emulate tapes storage pool module from flash memory;
(3) memory access control module is returned read data status through the external interface module to application module.
And the process of the specific data offset location reading of data of described emulate tapes storage pool module from flash memory comprises the steps:
1. judge and to read the bar code of tape, if can not read then carry out error handling processing;
2. read the bar code of tape;
3. judge whether bar code mates, if do not match then carry out error handling processing;
4. read the tape indexing table;
5. read data in the flash memory by magnetic tape format;
6. judge whether to read the rearmost position of desired data section, carry out 4.～6. if not then circulating;
7. notify memory access control module reading of data to finish.
And described tape emulation mode based on flash memory also is included in the flash memory outbound disposal route before preceding flash memory warehouse-in disposal route of data access and flash memory move, wherein:
Flash memory warehouse-in disposal route comprises the steps:
Step 1: application module sends SCSI tape warehouse-in warning order through the external interface module to the tape library simulation management module;
Step 2: the tape library simulation management module is checked the inlet/outlet state;
Step 3: the tape library simulation management module is returned the warehouse-in standby condition through the external interface module to application module;
Step 4: insert the hot plug flash memory;
Step 5: application module sends the SCSI tape through the external interface module to the memory access control module and goes into library command;
Step 6: the memory access control module reads tape bar code and data recording on tape form;
Step 7: the memory access control module is returned tape warehouse-in state through the external interface module to application module;
Flash memory outbound disposal route comprises the steps:
Step 1: application module sends the SCSI tape through the external interface module to the tape library simulation management module and goes out library command;
Step 2: the tape library simulation management module need to prepare the tape of outbound;
Step 3: the tape library simulation management module is removed tape lock and is ejected the hot plug flash memory;
Step 4: the memory access control module is returned tape outbound state through the external interface module to application module.
Advantage of the present invention and good effect are:
1, this tape emulation mode becomes flash memory emulation the tape of can off-line preserving; data write by virtual tape device linearity; finish writing the flash memory of data and can extract the off-line preservation at any time as tape; be used for data filing, exchanges data; simultaneously; emulation becomes the data in the off-line flash memory of tape to read on another virtual tape device, can be widely used in the teledata protection.
2, this tape emulation mode becomes flash memory emulation the tape of can off-line preserving, making full use of tape is the inherent characteristic of linear recording, energy off-line, write fashionable in data, each data of tape write all from next BOB(beginning of block) record, only that is to say writing completely whole flash memory and just get it right flash disk operation once, effectively improve the flash memory whole service life; During data deletion, the flash block at data place done a mark and not from the flash memory really data deletion, have only the data of whole flash memory to write and just begin from the beginning record after full, when having avoided this frequent small data quantity operation of large amount of small documents, database only at the drawback of a certain piece frequent read-write, can make full use of whole flash memory space, improve the service efficiency of flash memory.
3, this tape emulation mode organically combines flash memory and tape technologies; by the sequence number of flash memory being treated as the Brocode of tape; and with the capacity of flash memory capacity as tape; and tape attribute such as emulation write-protect; make flash memory become the mode of operation of tape; improve flash memory performance, expanded its scope of application.
4, this tape emulation mode is used for data filing with the tape that flash memory emulation becomes off-line to preserve, and low and need the data of long preservation for preserving utilization rate, disk storage is more effective than using.
5, the present invention becomes tape that can off-line with flash memory emulation and reads on another virtual tape device, has improved data security, and is convenient for users to use, improved flash memory performance, prolonged the serviceable life of flash memory, expanded its scope of application.
Description of drawings
Fig. 1 is the structural representation of tape virtual bench;
The tape emulated data that Fig. 2 is based on flash memory writes processing flow chart;
Fig. 3 is that flash memory emulate tapes storage pool module writes flow chart of data processing figure;
The tape emulated data that Fig. 4 is based on flash memory reads processing flow chart;
Fig. 5 is a flash memory emulate tapes storage pool module reading of data processing flow chart.
Fig. 6 is a flash memory warehouse-in processing flow chart;
Fig. 7 is a flash memory outbound processing flow chart.
Embodiment
Below in conjunction with accompanying drawing the embodiment of the invention is further described.
A kind of tape emulation mode based on flash memory, be on virtual tape device as shown in Figure 1, to realize, this virtual tape device comprises the external interface module, the tape library simulation management module, memory access control module and emulate tapes storage pool module, the external interface module is passed through NAS with the application module that is installed in the backup server on the one hand, iSCSI, the FCSCSI framework links together, on the other hand with the tape library simulation management module, the memory access control module is connected, and the memory access control module also is connected with emulate tapes storage pool module and tape library simulation management module respectively.The virtual tape device by with backup server in application module carry out the tape simulation process task that interactive work realizes flash memory.
Tape emulation mode based on flash memory becomes true tape by the virtual tape device with various flash memory emulation, and it is the sequence number of the flash memory Brocode as tape, with the capacity of flash memory capacity as tape, and tape attribute such as emulation write-protect.Tape is as a kind of linear recording method, can be from next BOB(beginning of block) record, each data write all from next BOB(beginning of block) record, the deletion of data be the flash block at data place is done a mark and not from the flash memory really data deletion, have only the data of whole flash memory to write and just begin from the beginning record after full.
A kind of tape emulation mode based on flash memory comprises that tape emulated data based on flash memory writes disposal route, the flash memory outbound disposal route before moving based on the tape emulated data reading and processing method of flash memory, flash memory warehouse-in disposal route before the data access and flash memory.
Tape emulated data based on flash memory writes disposal route, as shown in Figures 2 and 3, comprises the steps:
Step 1: the step of loading tape;
The step of loading tape comprises following processing procedure:
(1) application module sends SCSI through the external interface module to the tape library simulation management module and loads the tape order;
(2) the tape library simulation management module checks that the Drive Status luggage of going forward side by side carries tape and handles;
(3) the tape library simulation management module is returned the tape loading condition through the external interface module to application module;
The tape library simulation management module to application module return the tape loading condition comprise that tape loads successfully, Drive Status is unusual and tape loads three kinds of situations of failure; if Drive Status is unusual or tape loads failure; then this writes and handles failure, need carry out error handling processing.
Step 2: set the step that writes data offset;
The step that setting writes data offset comprises following processing procedure:
(1) application module sends the SCSI write command to the external interface module;
(2) the external interface module settings writes data offset and sends the memory access control module to;
The position of (3) memory access control module visit flash memory specific data side-play amount;
(4) memory access control module is returned the data offset state that writes of setting through the external interface module to application module;
Step 3: the step that writes data with the virtual tape form to flash memory;
Comprise following processing procedure with the virtual tape form to the step that flash memory writes data:
(1) application module sends to the memory access control module through the external interface module and writes data command;
(2) emulate tapes storage pool module writes data to the amount of the specifying Offsets position of flash memory;
(3) memory access control module is returned to application module through the external interface module and is write data mode;
Wherein, emulate tapes storage pool module writes the processing procedure of data to the amount of the specifying Offsets position of flash memory, as shown in Figure 5, comprising:
1. emulate tapes storage pool module judges whether flash memory formats, if not format then will flash memory enter next step after the format;
2. detect and to read the sequence number of flash memory, if can not read then carry out error handling processing;
3. read the sequence number and the capacity of flash memory,, obtain the capacity of tape according to the setting of tape library simulation management module the sequence number of flash memory bar code as tape;
4. judge whether GB on Tape satisfies data and write, if capacity inadequately then carry out error handling processing;
5. by the magnetic tape format record data;
6. read last piece number of record data;
7. from next BOB(beginning of block) record data;
Equal record data set metadata in the leader tape head index part in flash memory when 8. at every turn carrying out write operation;
9. the data endpoint that in tape, writes of record data and this takes the lead index part record metadata in flash memory;
10. notifying the memory access control module to write finishes.
Can realize with flash memory emulation being the function that writes data of tape by above-mentioned steps.
Tape emulated data reading and processing method based on flash memory as Fig. 4 and shown in Figure 5, comprises the steps:
Step 1: the step of loading tape;
The step of loading tape comprises following processing procedure:
(1) application module sends SCSI through the external interface module to the tape library simulation management module and loads the tape order;
(2) the tape library simulation management module checks that the Drive Status luggage of going forward side by side carries tape and handles;
(3) the tape library simulation management module is returned the tape loading condition through the external interface module to application module;
The tape library simulation management module to application module return the tape loading condition comprise that tape loads successfully, Drive Status is unusual and tape loads three kinds of situations of failure; if Drive Status is unusual or tape loads failure; then this writes and handles failure, need carry out error handling processing.
Step 2: the step of setting the reading of data side-play amount;
The step of setting the reading of data side-play amount comprises following processing procedure:
(1) application module sends the SCSI reading order to the external interface module;
(2) external interface module settings reading of data side-play amount and send the memory access control module to;
The position of (3) memory access control module visit flash memory specific data side-play amount;
(4) memory access control module is returned the reading of data side-play amount state of setting through the external interface module to application module;
Step 3: with the step of virtual tape form reading of data from flash memory
Comprise following processing procedure with virtual tape form step of reading of data from flash memory:
(1) application module sends the reading of data order through the external interface module to the memory access control module;
(2) the specific data offset location reading of data of emulate tapes storage pool module from flash memory;
(3) memory access control module is returned read data status through the external interface module to application module.
Wherein, the process of the specific data offset location reading of data of emulate tapes storage pool module from flash memory as shown in Figure 5, comprising:
1. judge and to read the bar code of tape, if can not read then carry out error handling processing;
2. read the bar code of tape;
3. judge whether bar code mates, if do not match then carry out error handling processing;
4. read the tape indexing table;
5. read data in the flash memory by magnetic tape format;
6. judge whether to read the rearmost position of desired data section, carry out 4.～6. if not then circulating;
7. notify memory access control module reading of data to finish.
Can realize that by above-mentioned steps from emulation be function of reading data the flash memory of tape.
Flash memory warehouse-in disposal route as Fig. 6, comprises the steps:
Step 1: application module sends SCSI tape warehouse-in warning order through the external interface module to the tape library simulation management module;
Step 2: the tape library simulation management module is checked the inlet/outlet state;
Step 3: the tape library simulation management module is returned the warehouse-in standby condition through the external interface module to application module;
Step 4: insert the hot plug flash memory;
Step 5: application module sends the SCSI tape through the external interface module to the memory access control module and goes into library command;
Step 6: the memory access control module reads tape bar code and data recording on tape form;
Step 7: the memory access control module is returned tape warehouse-in state through the external interface module to application module.
Can be implemented in the function of safety insertion flash memory in the virtual tape device by above-mentioned steps.
Flash memory outbound disposal route as shown in Figure 7, comprises the steps:
Step 1: application module sends the SCSI tape through the external interface module to the tape library simulation management module and goes out library command;
Step 2: the tape library simulation management module need to prepare the tape of outbound;
Step 3: the tape library simulation management module is removed tape lock and is ejected the hot plug flash memory;
Step 4: the memory access control module is returned tape outbound state through the external interface module to application module.
Can be implemented in the function that safety is extracted flash memory in the virtual tape device by above-mentioned warehouse-in and outbound disposal route.
Embodiment of the present invention is illustrative; rather than it is determinate; therefore invention is not limited to the embodiment described in the embodiment, and every other embodiments that drawn by those skilled in the art's technical scheme according to the present invention belong to the scope of protection of the invention equally.
Claims (9)
1. tape emulation mode based on flash memory is characterized in that: comprise that tape emulated data based on flash memory writes disposal route and based on the tape emulated data reading and processing method of flash memory, wherein:
Writing disposal route based on the tape emulated data of flash memory comprises the steps:
Step 1: the step of loading tape;
Step 2: set the step that writes data offset;
Step 3: the step that writes data with the virtual tape form to flash memory;
Tape emulated data reading and processing method based on flash memory comprises the steps:
Step 1: the step of loading tape;
Step 2: the step of setting the reading of data side-play amount;
Step 3: with the step of virtual tape form reading of data from flash memory.
2. the tape emulation mode based on flash memory according to claim 1, it is characterized in that: the step of described loading tape comprises following processing procedure:
(1) application module sends SCSI through the external interface module to the tape library simulation management module and loads the tape order;
(2) the tape library simulation management module checks that the Drive Status luggage of going forward side by side carries tape and handles;
(3) the tape library simulation management module is returned the tape loading condition through the external interface module to application module.
3. the tape emulation mode based on flash memory according to claim 1 is characterized in that: the step that described setting writes data offset comprises following processing procedure:
(1) application module sends the SCSI write command to the external interface module;
(2) the external interface module settings writes data offset and sends the memory access control module to;
The position of (3) memory access control module visit flash memory specific data side-play amount;
(4) memory access control module is returned the data offset state that writes of setting through the external interface module to application module.
4. the tape emulation mode based on flash memory according to claim 1 is characterized in that: describedly comprise following processing procedure with the virtual tape form to the step that flash memory writes data:
(1) application module sends to the memory access control module through the external interface module and writes data command;
(2) emulate tapes storage pool module writes data to the amount of the specifying Offsets position of flash memory;
(3) memory access control module is returned to application module through the external interface module and is write data mode.
5. the tape emulation mode based on flash memory according to claim 4 is characterized in that: described emulate tapes storage pool module comprises the steps: to the process that the amount of the specifying Offsets position of flash memory writes data
1. emulate tapes storage pool module judges whether flash memory formats, if not format then will flash memory enter next step after the format;
2. detect and to read the sequence number of flash memory, if can not read then carry out error handling processing;
3. read the sequence number and the capacity of flash memory,, obtain the capacity of tape according to the setting of tape library simulation management module the sequence number of flash memory bar code as tape;
4. judge whether GB on Tape satisfies data and write, if capacity inadequately then carry out error handling processing;
5. by the magnetic tape format record data;
6. read last piece number of record data;
7. from next BOB(beginning of block) record data;
Equal record data set metadata in the leader tape head index part in flash memory when 8. at every turn carrying out write operation;
9. the data endpoint that in tape, writes of record data and this takes the lead index part record metadata in flash memory;
10. notifying the memory access control module to write finishes.
6. the tape emulation mode based on flash memory according to claim 1 is characterized in that: the step of described setting reading of data side-play amount comprises following processing procedure:
(1) application module sends the SCSI reading order to the external interface module;
(2) external interface module settings reading of data side-play amount and send the memory access control module to;
The position of (3) memory access control module visit flash memory specific data side-play amount;
(4) memory access control module is returned the reading of data side-play amount state of setting through the external interface module to application module.
7. the tape emulation mode based on flash memory according to claim 1 is characterized in that: describedly comprise following processing procedure with virtual tape form step of reading of data from flash memory:
(1) application module sends the reading of data order through the external interface module to the memory access control module;
(2) the specific data offset location reading of data of emulate tapes storage pool module from flash memory;
(3) memory access control module is returned read data status through the external interface module to application module.
8. the tape emulation mode based on flash memory according to claim 7 is characterized in that: the process of the specific data offset location reading of data of described emulate tapes storage pool module from flash memory comprises the steps:
1. judge and to read the bar code of tape, if can not read then carry out error handling processing;
2. read the bar code of tape;
3. judge whether bar code mates, if do not match then carry out error handling processing;
4. read the tape indexing table;
5. read data in the flash memory by magnetic tape format;
6. judge whether to read the rearmost position of desired data section, carry out 4.～6. if not then circulating;
7. notify memory access control module reading of data to finish.
9. the tape emulation mode based on flash memory according to claim 1 is characterized in that: described tape emulation mode based on flash memory, also be included in the flash memory outbound disposal route before preceding flash memory warehouse-in disposal route of data access and flash memory move, wherein:
Flash memory warehouse-in disposal route comprises the steps:
Step 1: application module sends SCSI tape warehouse-in warning order through the external interface module to the tape library simulation management module;
Step 2: the tape library simulation management module is checked the inlet/outlet state;
Step 3: the tape library simulation management module is returned the warehouse-in standby condition through the external interface module to application module;
Step 4: insert the hot plug flash memory;
Step 5: application module sends the SCSI tape through the external interface module to the memory access control module and goes into library command;
Step 6: the memory access control module reads tape bar code and data recording on tape form;
Step 7: the memory access control module is returned tape warehouse-in state through the external interface module to application module;
Flash memory outbound disposal route comprises the steps:
Step 1: application module sends the SCSI tape through the external interface module to the tape library simulation management module and goes out library command;
Step 2: the tape library simulation management module need to prepare the tape of outbound;
Step 3: the tape library simulation management module is removed tape lock and is ejected the hot plug flash memory;
Step 4: the memory access control module is returned tape outbound state through the external interface module to application module.
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Application publication date: 20110209 |