CN105183601B - A kind of test disk rotational time, the method and device of cylinder capacity - Google Patents
A kind of test disk rotational time, the method and device of cylinder capacity Download PDFInfo
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Abstract
The invention discloses a kind of method and device for testing disk rotational time, including：The first block device layer input output request is created, the first block device layer input output request carries out the write operation of default size at 0 position；Order issues the write operation of the first block device layer input output request twice to disk；The second clock beat that the first timeticks and second of write operation that record first time write operation terminates respectively terminate；According to clock frequency, the time difference of first timeticks and second clock beat, the rotational time as disk are determined.In addition, present invention also offers a kind of method and device for testing disk cylinder capacity.As it can be seen that the present invention can easily test out the cylinder size and rotational time of disk, not only simplify disk rotational time and the process step of cylinder size test, while also assures that the accuracy of obtained result by carrying out I/O operation to disk.
Description
Technical field
The present invention relates to computer memory technical field, more particularly to one kind test disk rotational time, cylinder capacity
Method and device.
Background technology
Disk is present most popular storage medium due to possessing good balance in capacity, price and performance.
The characteristics of disk has itself, although capacity is big, cheap since itself intrinsic physical characteristic determines its property
The storage medium that can be updated relatively has very big difference.Just because of this, in order to provide better performance, more and more file systems
The characteristics of system and storage system can be directed to disk when design does many optimization.
The principal element for influencing disk performance is tracking time and rotational time, is frequently necessary to actual survey in a practical situation
These values are tried to help to estimate the performance of file system or storage system.At the same time to many metadata often read and write
Deng data message, it is also necessary to according to the physical characteristics of disk, the deposit position of metadata is adjusted according to the size of magnetic track, is tried one's best
Unnecessary tracking is avoided, so as to reduce the tracking time, improves the readwrite performance of storage system.
Therefore it provides a kind of test disk rotational time, the method and device of cylinder capacity are necessary.
The content of the invention
The object of the present invention is to provide a kind of method and device for testing disk rotational time, cylinder capacity, it is therefore intended that
Solve the problems, such as cannot easily to test out the rotational time and cylinder size of disk in the prior art.
In order to solve the above technical problems, the present invention provides a kind of method for testing disk rotational time, including：
Create the first block device layer input output request, the first block device layer input output request at 0 position into
The write operation of the default size of row；
Order issues the write operation of the first block device layer input output request twice to disk；
The second clock that the first timeticks and second of write operation that record first time write operation terminates respectively terminate
Beat；
According to clock frequency, the time difference of first timeticks and second clock beat is determined, as disk
Rotational time.
Alternatively, block device layer input output request is initiated in linux system kernel.
Alternatively, further include：
Disk queue dispatching algorithm is arranged to do-nothing operation in advance；It is closing cache mode by disk write mode setting.
Alternatively, the process of the rotational time of disk is repeatedly determined, using the average value of multiple rotary time as rotation
Turn the time.
Present invention also offers a kind of device for testing disk rotational time, including：
First creation module, for creating the first block device layer input output request, the first block device layer input is defeated
Go out the write operation that request carries out default size at 0 position；
First issues module, issues the write operation of the first block device layer input output request twice to disk for order；
First logging modle, for recording the first timeticks and write behaviour for the second time that first time write operation terminates respectively
Make the second clock beat terminated；
First determining module, for according to clock frequency, determining first timeticks and second clock beat
Time difference, the rotational time as disk.
Present invention also offers a kind of method for testing disk cylinder capacity, including：
The first block device layer input output request and the second block device layer input output request are created, described first piece sets
Standby layer input output request carries out the write operation of default size at 0 position, the second block device layer input output request from
The write operation of the default size is carried out at default bias amount position；
Order to disk issue the first block device layer input output request write operation and the second block device layer input it is defeated
Go out the write operation of request；
Record the time of the write operation of the second block device layer input output request；
Gradually increase the size of the default bias amount according to preset increments, repetition is above-mentioned to issue the first block device to disk
The process of the write operation of layer input output request and the write operation of the second block device layer input output request, obtains each successively
The time of the write operation of second block device layer input output request；
When the time of write operation being unsatisfactory for default rule, according to the number of current write operation, the default bias amount with
And the preset increments determine the cylinder capacity of disk.
Alternatively, block device layer input output request is initiated in linux system kernel.
Alternatively, further include：
Disk queue dispatching algorithm is arranged to do-nothing operation in advance；It is closing cache mode by disk write mode setting.
Present invention also offers a kind of device for testing disk cylinder capacity, including：
Second creation module, for creating the first block device layer input output request and the second block device layer input and output
Request, the first block device layer input output request carry out the write operation of default size, second block device at 0 position
Layer input output request carries out the write operation of the default size at default bias amount position；
Second issues module, issues the write operation and of the first block device layer input output request to disk for order
The write operation of two block device layer input output requests；
Second logging modle, the time of the write operation for recording the second block device layer input output request；
Acquisition module, for gradually increasing the size of the default bias amount according to preset increments, repeats above-mentioned to disk
Issue the mistake of the write operation of the first block device layer input output request and the write operation of the second block device layer input output request
Journey, obtains the time of the write operation of the second block device layer input output request every time successively；
Second determining module, for when the time of write operation being unsatisfactory for default rule, according to the number of current write operation,
The default bias amount and the preset increments determine the cylinder capacity of disk.
The method and device of test disk rotational time provided by the present invention, it is defeated by creating the input of the first block device layer
Go out request；Order issues the write operation of the first block device layer input output request twice to disk；Record writes behaviour for the first time respectively
The second clock beat that the first timeticks and second of write operation that work terminates terminate；According to clock frequency, first is determined
The time difference of timeticks and second clock beat, the rotational time as disk.In addition, present invention also offers one kind
Test the method and device of disk cylinder capacity.As it can be seen that the present invention can be tested easily by carrying out I/O operation to disk
Go out the cylinder size and rotational time of disk, not only simplify disk rotational time and the process step of cylinder size test, together
When also assures that the accuracy of obtained result.
Brief description of the drawings
Fig. 1 is a kind of flow chart of embodiment of the method for test disk rotational time provided by the present invention；
Fig. 2 is the flow chart of another embodiment of the rotational time of test disk provided by the present invention；
Fig. 3 is a kind of structural frames of embodiment of the device of test disk rotational time provided by the present invention
Figure；
Fig. 4 is a kind of flow chart of embodiment of the method for test disk cylinder capacity provided by the present invention；
Fig. 5 is the flow of another embodiment of the method for test disk cylinder capacity provided by the present invention
Figure；
Fig. 6 is a kind of structural frames of embodiment of the device of test disk cylinder capacity provided by the present invention
Figure.
Embodiment
In order to make those skilled in the art more fully understand the present invention program, with reference to the accompanying drawings and detailed description
The present invention is described in further detail.Obviously, described embodiment is only part of the embodiment of the present invention, rather than
Whole embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise
Lower all other embodiments obtained, belong to the scope of protection of the invention.
A kind of flow chart such as Fig. 1 institutes of embodiment of the method for test disk rotational time provided by the present invention
Show, this method includes：
Step S101：Create the first block device layer input output request, the first block device layer input output request is from 0
The write operation of default size is carried out at position；
Step S102：Order issues the write operation of the first block device layer input output request twice to disk；
Step S103：What the first timeticks and second of write operation that record first time write operation terminates respectively terminated
Second clock beat；
Step S104：According to clock frequency, the time difference of first timeticks and second clock beat is determined,
Rotational time as disk.
The method of test disk rotational time provided by the present invention, please by creating the first block device layer input and output
Ask；Order issues the write operation of the first block device layer input output request twice to disk；First time write operation knot is recorded respectively
The second clock beat that the first timeticks and second of write operation of beam terminate；According to clock frequency, the first clock is determined
The time difference of beat and second clock beat, the rotational time as disk.As it can be seen that the present invention to disk by carrying out I/
O operation, can easily test out the rotational time of disk, be particularly suitable in disk characteristics test.
Flow chart such as Fig. 2 institutes of another embodiment of the rotational time of test disk provided by the present invention
Show, this method includes：
Step S201：Disk queue dispatching algorithm is arranged to NOOP in advance；
Wherein, NOOP refers to the Optimization scheduling algorithm without using disk, avoids algorithm from being influenced caused by test result.
Step S202：It is Write-through to set disk WriteMode；
Disk is directly write data into without using disk buffering when disk write operation is carried out, makes test result more
It is accurate to add.
Step S203：Create the Bio at a write magnetic disk address 0, in the application Bio refer to block device layer input and output please
Ask；
Step S204：Order issues Bio twice to disk；
Step S205：In the call back function of Bio, the first timeticks Time1 that first time write operation terminates is recorded；
Step S206：In the call back function of Bio, the second clock beat Time2 that second of write operation terminates is recorded；
Step S207：With reference to clock frequency, the time difference of Time2 and Time1 is calculated, is rotational time.
As a kind of preferred embodiment, the present embodiment can further include：
The operation n times of repeat step S204 to step S207, calculate the average value of n times, so as to obtain rotational time Time.
Wherein, N refers to the number of repetitive read-write, and the rotational time that number to be obtained is also more accurate.
Write operation is repeated by 0 position of disk address, being carried out to disk in the present embodiment, and records a time
Value.Identical size is write every time, such as can be set as 4KB, can be specified when creating.By required for acquisition completion Bio operations
Time the rotational time of disk is calculated.Compared with a upper embodiment, the present embodiment sets disk first before writing
The WriteMode of queue scheduling algorithm and disk, to forbid using any dispatching algorithm and disk buffering, avoids both to result
Caused by influence, the accuracy of test can be further improved.
It is pointed out that Bio is the input output request of block device layer in storage system in the present invention, it may be determined that read-write
The size and location of operation.The Bio can call a call back function being previously set after completing to ask.
It is pointed out that some positions that the present invention reads and writes disk by initiating Bio in linux system kernel, and
It is not to initiate read-write requests from User space.From kernel state initiate request can reduce as far as possible from initiate request to disk perform please
Middle process is sought, error can be reduced.
By the clock frequency of system clock beat computing system first in the present invention, obtained when needing and accumulating system time
Timeticks, and obtained according to the above-mentioned system clock frequency being calculated needing the time value that records.
A kind of structure diagram such as Fig. 3 of embodiment of the device of test disk rotational time provided by the present invention
Shown, which includes：
First creation module 100, for creating the first block device layer input output request, the first block device layer input
Output request carries out the write operation of default size at 0 position；
First issues module 200, and behaviour is write to what disk issued the first block device layer input output request twice for order
Make；
First logging modle 300, for recording the first timeticks and second that first time write operation terminates respectively
The second clock beat that write operation terminates；
First determining module 400, for according to clock frequency, determining first timeticks and second clock beat
Time difference, the rotational time as disk.
The device of test disk rotational time provided by the present invention, please by creating the first block device layer input and output
Ask, the write operation of the first block device layer input output request twice is sequentially issued to disk, record first time write operation knot respectively
The second clock beat that the first timeticks and second of write operation of beam terminate；According to clock frequency, the first clock is determined
The time difference of beat and second clock beat, the rotational time as disk.As it can be seen that the present invention to disk by carrying out I/
O operation, can easily test out the rotational time of disk, be particularly suitable in disk characteristics test.
The device of test disk rotational time provided by the present invention is corresponding with above-mentioned test method, no longer superfluous herein
State.
A kind of flow chart such as Fig. 4 institutes of embodiment of the method for test disk cylinder capacity provided by the present invention
Show, this method includes：
Step S301：Create the first block device layer input output request and the second block device layer input output request, institute
State the write operation that the first block device layer input output request carries out default size at 0 position, the second block device layer input
Output request carries out the write operation of the default size at default bias amount position；
Step S302：Order issues the write operation and the second block device of the first block device layer input output request to disk
The write operation of layer input output request；
Step S303：Record the time of the write operation of the second block device layer input output request；
Step S304：Gradually increase the size of the default bias amount according to preset increments, repetition is above-mentioned to be issued to disk
The process of the write operation of the write operation of first block device layer input output request and the second block device layer input output request, according to
The secondary time for obtaining every time the write operation of the second block device layer input output request；
Step S305：When the time of write operation being unsatisfactory for default rule, according to the number of current write operation, described default
Offset and the preset increments determine the cylinder capacity of disk.
Number such as current write operation is n, and default bias amount is a, preset increments b, then the cylinder capacity of disk is a+
(n-1)b。
The method of test disk cylinder capacity provided by the present invention, by being written and read to disk diverse location, analysis
The read-write operation time, and then obtain cylinder size.
Flow chart such as Fig. 5 of another embodiment of the method for test disk cylinder capacity provided by the present invention
Shown, this method includes：
Step S401：It is NOOP to set disk queue dispatching algorithm；
Wherein, NOOP refers to the Optimization scheduling algorithm without using disk, avoids algorithm from being influenced caused by test result.
Step S402：It is Write-through to set disk WriteMode；
Disk is directly write data into without using disk buffering when disk write operation is carried out, makes test result more
It is accurate to add.
Step S403：The first block device layer input output request Bio at a write magnetic disk address 0 is created (to be denoted as
bio1)；
Step S404：Create the second block device layer input output request at a write magnetic disk address default bias amount position
Bio (is denoted as bio2), and default bias amount offset can be 4KB；
Step S405：Order submits bio1 and bio2, record present clock beat Time0；
Step S406：Recorded respectively in the call back function that Bio is completed timeticks Time1 when two Bio are completed and
Time2；
Step S407：Time Time used in bio2 write operations is calculated by Time2 and Time0；
Step S408：Offset identity offset is increased into 4KB, repeats n times step S405 to step S407；
Step S409：Analysis obtains N number of time value, obtains the frequency n of write operation when time of occurrence increases suddenly, n*4KB
It is exactly the size of the disk cylinder.
Preferably, above-mentioned N values can be obtained initially by estimating the largest amount of a cylinder, with the disk one estimated
The value that the size (4KB) of a possible maximum capacity of cylinder divided by each write operation obtains is N.
The present embodiment by being initiated in kernel state to the write operation of disk feature position, write identical big by each write operation
It is small, 4KB is such as may be set to, which can be by user's sets itself, this does not influence the realization of the present invention.Record write operation institute
Time value, each write operation will ensure that magnetic head is returned at 0 position of address of disk afterwards, i.e., go out carry out one to 0 address
Secondary write operation.Gradually increase the address write, such as increase 4KB sizes, the time used in so each write operation can also be presented every time
Incremental trend.For write address in the same cylinder of disk, this value is a regular growth.When write address increases to one
Determine degree, more than cylinder size when, it is necessary to replace cylinder, at this time the time of write operation will no longer there was only rotational time,
A tracking time can also be increased, therefore, at this moment a state increased suddenly occurs in the time value used in write operation, at the same time
Rotational time of this value also greater than disk.By analyzing before this state is reached, the number of the write operation carried out,
Current write address is namely obtained, this value is the size of one cylinder of disk.
Similarly, compared with a upper embodiment, the queue scheduling of disk is set first in the present embodiment before all operations
Algorithm and WriteMode, to forbid using any dispatching algorithm and disk buffering, avoid both from being influenced caused by result, into one
Step improves the accuracy of test result.
A kind of structure diagram such as Fig. 6 of embodiment of the device of test disk cylinder capacity provided by the present invention
Shown, which includes：
Second creation module 500, for creating the first block device layer input output request and the input of the second block device layer
Output request, the first block device layer input output request carry out the write operation of default size at 0 position, described second piece
Mechanical floor input output request carries out the write operation of the default size at default bias amount position；
Second issues module 600, for order to disk issue the write operation of the first block device layer input output request with
And second block device layer input output request write operation；
Second logging modle 700, the time of the write operation for recording the second block device layer input output request；
Acquisition module 800, for gradually increasing the size of the default bias amount according to preset increments, repeats above-mentioned to magnetic
Disk issues the write operation of the first block device layer input output request and the write operation of the second block device layer input output request
Process, obtains the time of the write operation of the second block device layer input output request every time successively；
Second determining module 900, for when the time of write operation being unsatisfactory for default rule, according to time of current write operation
Several, described default bias amount and the preset increments determine the cylinder capacity of disk.
The device of test disk cylinder capacity provided by the present invention is corresponding with above-mentioned test method, no longer superfluous herein
State.
To sum up, the data such as the rotational time of disk and cylinder size are typically only possible by the hardware testing acquisition of producer, and
, it is necessary to carry out actual test understanding to these parameters in actual software design procedure, and user is surveyed by client layer software
The result precision that the method for examination obtains is far short of what is expected, and the present invention reads and writes disk by initiating Bio in linux system kernel
Some positions, by obtaining the rotational time for completing Bio and operating required time and disk being calculated, while by magnetic
Disk diverse location is read and write, and analyzes the read-write operation time, and then obtain cylinder size.
This invention simplifies the process step that disk rotational time and cylinder size are tested, while it ensure that obtained knot
The accuracy of fruit.And by issuing Bio from kernel to disk, disk can call corresponding function after having performed the Bio, with
Maximize and reduce Bio in the error caused by the stand-by period before entering disk and the stand-by period after completion.
Signified disk of the invention refers to preserve the common machine of data by magnetizing disc by what disc, magnetic head etc. formed
Tool formula disk.It includes tracking time, rotational time and stand-by period in the time of I/O operation.
Cylinder refers to that the capacity of one cylinder includes the appearance of multiple magnetic tracks comprising the magnetic track on same position multiple disc
Amount.
Each embodiment is described by the way of progressive in this specification, what each embodiment stressed be with it is other
The difference of embodiment, between each embodiment same or similar part mutually referring to.
The foregoing description of the disclosed embodiments, enables professional and technical personnel in the field to realize or use the present invention.
A variety of modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, it is of the invention
The embodiments shown herein is not intended to be limited to, and is to fit to and the principles and novel features disclosed herein phase one
The most wide scope caused.
Claims (7)
- A kind of 1. method for testing disk rotational time, it is characterised in that including：The first block device layer input output request is created, the first block device layer input output request carries out in advance at 0 position If the write operation of size；Order issues the write operation of the first block device layer input output request twice to disk；The second clock beat that the first timeticks and second of write operation that record first time write operation terminates respectively terminate；According to clock frequency, the time difference of first timeticks and second clock beat, the rotation as disk are determined Turn the time；Wherein, block device layer input output request is initiated in linux system kernel.
- 2. the method for test disk rotational time as claimed in claim 1, it is characterised in that further include：Disk queue dispatching algorithm is arranged to do-nothing operation in advance；It is closing cache mode by disk write mode setting.
- 3. the method for test disk rotational time as claimed in claim 2, it is characterised in that repeatedly determine the rotation of disk Turn the process of time, using the average value of multiple rotary time as rotational time.
- A kind of 4. device for testing disk rotational time, it is characterised in that including：First creation module, for creating the first block device layer input output request, the first block device layer input and output please Seek the write operation that default size is carried out at 0 position；First issues module, issues the write operation of the first block device layer input output request twice to disk for order；First logging modle, the first timeticks and second of write operation knot terminated for recording first time write operation respectively The second clock beat of beam；First determining module, for according to clock frequency, determining the time of first timeticks and second clock beat Difference, the rotational time as disk；Wherein, block device layer input output request is initiated in linux system kernel.
- A kind of 5. method for testing disk cylinder capacity, it is characterised in that including：Create the first block device layer input output request and the second block device layer input output request, first block device layer Input output request carries out the write operation of default size at 0 position, and the second block device layer input output request is from default The write operation of the default size is carried out at offset location；Order issues the write operation of the first block device layer input output request to disk and the second block device layer input and output please The write operation asked；Record the time of the write operation of the second block device layer input output request；Gradually increase the size of the default bias amount according to preset increments, repeat that above-mentioned to disk to issue the first block device layer defeated Enter the process of the write operation of output request and the write operation of the second block device layer input output request, obtain every time second successively The time of the write operation of block device layer input output request；When the time of write operation being unsatisfactory for default rule, according to the number of current write operation, the default bias amount and institute State the cylinder capacity that preset increments determine disk；Wherein, block device layer input output request is initiated in linux system kernel.
- 6. the method for test disk cylinder capacity as claimed in claim 5, it is characterised in that further include：Disk queue dispatching algorithm is arranged to do-nothing operation in advance；It is closing cache mode by disk write mode setting.
- A kind of 7. device for testing disk cylinder capacity, it is characterised in that including：Second creation module, please for creating the first block device layer input output request and the second block device layer input and output Ask, the first block device layer input output request carries out the write operation of default size, second block device layer at 0 position Input output request carries out the write operation of the default size at default bias amount position；Second issues module, for order to disk issue the first block device layer input output request write operation and second piece The write operation of mechanical floor input output request；Second logging modle, the time of the write operation for recording the second block device layer input output request；Acquisition module, for gradually increasing the size of the default bias amount according to preset increments, repetition is above-mentioned to be issued to disk The process of the write operation of the write operation of first block device layer input output request and the second block device layer input output request, according to The secondary time for obtaining every time the write operation of the second block device layer input output request；Second determining module, for when the time of write operation being unsatisfactory for default rule, according to the number of current write operation, described Default bias amount and the preset increments determine the cylinder capacity of disk；Wherein, block device layer input output request is initiated in linux system kernel.
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| CN201510607909.8A CN105183601B (en) | 2015-09-22 | 2015-09-22 | A kind of test disk rotational time, the method and device of cylinder capacity |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6654850B2 (en) * | 2001-03-26 | 2003-11-25 | Seagate Technology Llc | Parametric optimization of a disc drive through I/O command sequence analysis |
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2015
- 2015-09-22 CN CN201510607909.8A patent/CN105183601B/en active Active
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| US4851998A (en) * | 1987-06-03 | 1989-07-25 | I/O Xel, Inc. | Method for analyzing performance of computer peripherals |
| CN103226448A (en) * | 2013-03-21 | 2013-07-31 | 华为技术有限公司 | Driving method and device for SSD (solid state disk) |
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| "一种通用的磁盘参数提取算法";李冬;《高职论丛》;20071231(第4期);第9-12、23页 * |
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