CN101510143B - Storage space dynamic assignment method, system and storage apparatus - Google Patents
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Abstract
The invention proposes a memory space dynamic allocation method and system and a memory device; the method comprises the steps: the memory device detects whether a logical volume meeting the capacity expansion conditions exists in the system or not, if so, the business model type of the logical volume is obtained according to the identification (ID) of the logical volume; the memory device looks up a resource list according to the ID of the logical volume or the business model type, determines RAID matched with the logical volume according to the corresponding relation of the ID of the logical volume in the resource list, the business model type and a redundant array of inexpensive discs, and carries out capacity expansion to the logical volume by using the RAID. The invention can meet the requirement of application service and save the memory space of the system simultaneously.
Description
Technical Field
The present invention relates to the field of storage technologies, and in particular, to a method, a system, and a storage device for dynamically allocating a storage space.
Background
Thin Provisioning (Thin Provisioning) is an automatic allocation and utilization of available storage space to avoid unlimited access to disk space.
The Thin Provisioning technology can enable a user to reasonably allocate virtual disk storage capacity according to expected future requirements of the user, so that the problem that physical disk storage space is allocated in advance, the utilization rate of the storage space is improved, allocated unused space is cleared, and the problem that the allocation of the storage space is lack of elasticity and is always very troubled is solved. For example: the user is given a 100G space, and only a 20G space is needed when the user actually applies the application, so the storage system gives the user the 20G space, and the other 80G space can be given to other users. When the user uses up 20G of space, requiring reuse space, the system reconfigures the space to the user. All these operations are transparent to the user, who sees 100G of space all the time at the client. When a user needs an additional physical disk, the additional physical disk can be added later at a lower cost, so that the Thin Provisioning technology can play a role in improving the utilization rate of the storage capacity and reducing the investment cost.
In the Thin Provisioning implementation of a general storage system, a storage administrator first allocates a plurality of Redundant Array of Inexpensive Disks (RAID) for Thin Provisioning space allocation to one storage pool, and then a plurality of servers share RAID resource space in the storage pool. In pool provisioning, a typical storage system implementation allows multiple RAID types to be included in the same pool. When the application service is initially configured, a storage administrator may select a RAID with a suitable RAID type for creating a storage space according to the requirement of the application service, and allocate the RAID to a logical volume mounted on a server for providing storage of the application service. When a logical volume runs out of the assigned RAID, the storage system needs to find a RAID in the storage pool again to expand the logical volume. At this time, the storage system no longer selects a RAID suitable for the RAID type for the logical volume, but selects one RAID at random or according to rules such as the numbering order of the RAIDs, and then divides the space to provide to the logical volume.
However, different application services have different requirements on storage space, such as: some application services must guarantee the reliability of the service, so the logical volume storing the application service needs to have a high redundancy level of RAID; some application services must ensure high performance of services and have low requirements on reliability, so that a logical volume storing the application services needs to have high performance of RAID; and so on. Obviously, the above storage system cannot completely satisfy the requirement of the application service stored in the logical volume by selecting the RAID for the logical volume during capacity expansion, which may cause waste of the application service or waste of storage space.
Disclosure of Invention
The embodiment of the invention provides a method for dynamically allocating storage space, which can meet the requirements of application services and save the storage space of a system.
The embodiment of the invention also provides a storage device for dynamically allocating the storage space, which can meet the requirements of application services and save the storage space of a system.
The technical scheme of the embodiment of the invention is realized as follows:
a method of dynamically allocating memory, comprising:
the storage device detects whether a logical volume meeting capacity expansion conditions exists in the system, and if yes, the service model type of the logical volume is obtained according to the Identification (ID) of the logical volume;
the storage device searches a resource list according to the ID or the service model type of the logical volume, determines the RAID matched with the logical volume, and expands the capacity of the logical volume by using the RAID;
the resource list comprises an array resource list and an ACL table item; the array resource table comprises a corresponding relation of array attributes, array types and IDs of array created logical volumes; the ACL table items comprise corresponding relations of a service model type, an array type and a priority;
the step of determining a matching RAID comprises:
searching an array resource table according to the ID of the logical volume, and determining that the RAID is a matched RAID when the available space in the array attribute of the RAID of the created logical volume meets the capacity expansion requirement of the logical volume; otherwise, searching ACL list items according to the service model type of the logical volume, determining the array type of each priority corresponding to the service model type, searching an array resource table according to the sequence of the priority from high to low, obtaining the array attribute of the RAID corresponding to the array type, determining the RAID as the matched RAID when the available space in the array attribute meets the capacity expansion requirement of the logical volume, and finishing the step of searching the array resource table;
or, directly searching ACL list items according to the service model type of the logical volume, and determining the array type of each priority corresponding to the service model type; searching an array resource table according to the sequence of the priority from high to low, obtaining the array attribute of the RAID corresponding to the array type, determining the RAID as the matched RAID when the available space in the array attribute meets the capacity expansion requirement of the logical volume, and finishing the step of searching the array resource table.
A storage device that dynamically allocates storage space, comprising: the system comprises a detection and acquisition module, a database module and an inquiry and expansion module;
the detection and acquisition module is used for detecting whether a logical volume meeting capacity expansion conditions exists in the system or not, and if so, acquiring the service model type of the logical volume according to the ID of the logical volume;
the database module is used for storing a resource list, and the resource list comprises an array resource list and an ACL (access control list) table entry; the array resource table comprises a corresponding relation of array attributes, array types and IDs of array created logical volumes; the ACL table items comprise corresponding relations of a service model type, an array type and a priority;
the query and expansion module is used for searching a resource list stored by the database module according to the ID of the logical volume or the service model type acquired by the detection and acquisition module, determining the RAID matched with the logical volume, and expanding the capacity of the logical volume by using the RAID; the method for acquiring the matched RAID is as follows: searching an array resource table according to the ID of the logical volume, when the available space in the array attribute of the RAID of the logical volume is created to meet the capacity expansion requirement of the logical volume, determining that the RAID is a matched RAID, otherwise, searching an ACL table item according to the service model type of the logical volume, determining the array type of each priority corresponding to the service model type, searching the array resource table according to the sequence of the priority from high to low to obtain the array attribute of the RAID corresponding to the array type, when the available space in the array attribute meets the capacity expansion requirement of the logical volume, determining that the RAID is the matched RAID, and finishing the search of the array resource table; or, directly searching ACL list items according to the service model type of the logical volume, and determining the array type of each priority corresponding to the service model type; searching the array resource table according to the sequence of the priority from high to low, obtaining the array attribute of the RAID corresponding to the array type, determining the RAID as the matched RAID when the available space in the array attribute meets the capacity expansion requirement of the logical volume, and finishing the search of the array resource table.
It can be seen that, the method for dynamically allocating storage space and the storage device provided by the present invention set up a thin provisioning client module in a server, which is used for setting up a service model type of each logical volume mounted on the server, and reporting the service model type of the logical volume to the storage device; after detecting that a logical volume meeting capacity expansion conditions exists in the system, the storage device acquires the service model type of the logical volume; and the storage device also stores a resource list in advance, searches the resource list according to the ID or the service model type of the logical volume meeting the capacity expansion condition, determines the RAID suitable for the logical volume, and adopts the RAID to expand the capacity of the logical volume. By the method, the RAID which can meet the application service requirement can be selected for the logical volume for capacity expansion, so that the application service can be met, and the storage space can be saved.
Drawings
FIG. 1 is a schematic structural diagram of a system to which an embodiment of the method of the present invention is applied;
FIG. 2 is a flow chart of an embodiment of the method of the present invention;
FIG. 3 is a schematic structural diagram of a memory device according to an embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a method for dynamically allocating storage space, which comprises the following steps:
the storage device detects whether a logical volume meeting capacity expansion conditions exists in the system, and if yes, the service model type of the logical volume is obtained according to the Identification (ID) of the logical volume;
and the storage device searches a resource list according to the identification ID of the logical volume or the service model type, determines the RAID matched with the logical volume according to the corresponding relation among the ID of the logical volume, the service model type and the RAID in the resource list, and expands the capacity of the logical volume by using the RAID.
The following detailed description refers to specific embodiments.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a system to which the embodiment of the method of the present invention is applied. The system includes a storage device and one or more servers, each of which has one or more logical volumes mounted thereon. In fig. 1, the entire network has 3 servers, and 5 logical volumes are mounted.
Before the method for dynamically allocating the storage space of the present invention, the following settings need to be made in advance for the system.
The first step is as follows: a Thin Provisioning (Thin Provisioning) client module is preset in each server and used for setting the service model type of each logical volume mounted on the server. The preset service model types are shown in the following table 1:
| logical volume ID | Stored content | Business model types |
| 1 | oracle data file | a |
| 2 | Oracle's redo log file | b |
| 3 | Archive log file of oracle | c |
| 4 | Large number of less important video files | d |
| 5 | Small data size file of high importance | e |
TABLE 1
The second step is that: a resource list is set in advance in a storage device, and the resource list includes the corresponding relation between the ID of the logical volume or the type of the business model and the RAID. Specifically, the resource list may include ACL entries and array resource tables for RAID;
(1) and the ACL list item comprises the corresponding relation of the service model type, the array type and the priority. As shown in table 2:
| business model types | Optimal rank array type | Second order array type |
| a | RAID5 | RAID 10 |
| b | RAID 10 | RAID 5 |
| c | RAID 0 | RAID 10 |
| d | RAID 0 | RAID 5 |
| e | RAID 5 | RAID 10 |
TABLE 2
As shown in the second row of table 2, the logical volume with the service model type a has the highest priority, the corresponding array type is RAID5, the priority is the next highest priority, and the corresponding array type is RAID 10. Of course, when setting the ACL entry, the array type corresponding to the third priority may be set again, or only the optimal array type may be set, which is not limited in the present invention.
(2) And the array resource table comprises the corresponding relation of the array attribute, the array type and the ID of the array created logical volume. As shown in table 3:
TABLE 3
The following describes the detailed procedure of an embodiment of the method of the present invention. The method is applied to the system shown in fig. 1.
The method comprises the following steps:
referring to fig. 2, fig. 2 is a flow chart of an embodiment of the method of the present invention.
The first stage is as follows: the storage device obtains the service model type of the logical volume that meets the capacity expansion condition, and specifically includes step 201 and step 202.
Step 201: the storage device detects whether a logical volume satisfying a capacity expansion condition exists in the system, and if so, transmits a preliminary capacity expansion message to the server on which the logical volume is mounted according to the ID of the logical volume.
Wherein, the above-mentioned condition of capacity expansion may be specifically: the space utilization rate reaches a preset threshold value. The predetermined threshold may be manually preset, for example, set to 80%. The expansion ratio may also be preset, for example, to 20% of the current space size.
In this embodiment, the space originally allocated to the logical volume 3 is 1000G, and at this time, the space used by the logical volume 3 is 800G, and the storage device detects that the space usage rate of the logical volume 3 reaches 80% set in advance, and the space to be expanded is 20% of 1000G, that is, 200G.
The storage apparatus transmits a preliminary volume expansion message to the server 1 on which the logical volume 3 is mounted.
Step 202: the server 1 receives the prepared capacity expansion message, looks up the table 1, finds that the service model type of the logical volume 3 is type c, and reports the service model type of the logical volume 3 to the storage device.
The above step 201 and step 202 are only one way for the storage device to obtain the service model type of the logical volume satisfying the capacity expansion condition, and the present invention further provides another obtaining way, including step 201 'and step 202' (not shown in fig. 2):
step 201': the server sends the service model types of all the logic volumes mounted by the server to a storage device; the sending time here may be repeatedly sent at a fixed time interval, or may be sent after each update, and the present invention is not limited herein;
step 202': the storage device detects whether a logical volume meeting capacity expansion conditions exists in the system, and if yes, the service model type of the logical volume is searched according to the ID of the logical volume.
And a second stage: the storage device expands the capacity of the logical volume meeting the capacity expansion condition, and specifically comprises the following steps:
step 205: the storage device searches an array resource table according to the ID of the logical volume, determines whether an available space in the array attribute of the RAID that has created the logical volume meets the capacity expansion requirement of the logical volume, and if the available space meets the requirement, determines that the RAID is a matching RAID suitable for capacity expansion of the logical volume, and performs step 205; if not, step 204 is performed.
In this embodiment, first, look up table 3 to find that the array ID of the RAID that has created logical volume 3 is 81, the available space of the RAID is 100G, and the space that needs to be expanded for logical volume 3 is 200G at this time, so that the expansion requirement cannot be satisfied.
Step 204: searching ACL table items according to the service model type of the logical volume, and determining the array type of each priority corresponding to the service model type; searching the array resource table according to the sequence of the priority from high to low, obtaining the array attribute of the RAID corresponding to the array type, determining the RAID as the matched RAID when the available space in the array attribute meets the capacity expansion requirement of the logical volume, and finishing the step of searching the array resource table.
In this embodiment, first, look up table 2, find out that the service model type of the logical volume 3 is c, the optimal array type is RAID0, and the suboptimal array type is RAID 10. Then, look up table 3, in table 3, the available space of the RAID array with the array type of RAID0 is 100G, and the space that needs to be expanded by logical volume 3 is 200G, which cannot meet the requirement; continuing to find the suboptimal type, the array available space for the RAID with array type of RAID10 is 300G, which can meet the requirement, so determining the RAID with array ID of 80 as the RAID suitable for the logical volume continues to execute step 205.
Step 205: the determined RAID is used to expand the logical volume 3. The specific manner of expansion is the same as in the prior art and is not cumbersome here.
After step 202, step 203 may not be performed, and step 204 may be performed directly, as shown by the dotted line in fig. 2.
In the above embodiment, there are two RAID determination methods suitable for capacity expansion, where in the first method, a RAID that has already created a logical volume that needs to be expanded is first searched, and the capacity expansion is preferentially performed by using the RAID, which is more centralized in allocation of a logical space; the second mode directly searches the RAID matched with the service model type of the logical volume, can ensure that the RAID used for capacity expansion is most suitable for the logical volume, and ensures that the performance of the system is better.
The embodiment of the present invention further provides a system for dynamically allocating a storage space, where the system includes: a storage device and one or more servers; mounting one or more than one logical volume on each server; wherein,
the storage device is used for detecting whether a logical volume meeting capacity expansion conditions exists in the system, and if yes, acquiring the service model type of the logical volume according to the ID of the logical volume; and the RAID is used for searching a resource list according to the ID of the logical volume or the service model type, determining the RAID matched with the logical volume according to the corresponding relation among the ID of the logical volume, the service model type and the RAID in the resource list, and expanding the capacity of the logical volume by using the RAID.
Wherein, the above-mentioned condition of capacity expansion may be specifically: the space utilization rate reaches a preset threshold value. The predetermined threshold may be manually preset, for example, set to 80%. The expansion ratio may also be preset, for example, to 20% of the current space size.
In the system, the storage device may be configured to, when it is detected that a logical volume satisfying a capacity expansion condition exists in the system, send a preliminary capacity expansion message to a server on which the logical volume is mounted according to an ID of the logical volume; receiving the service model type of the logical volume reported by the server;
the server may include a thin provisioning client module, where the thin provisioning client module is configured to receive a preparation capacity expansion message sent by a storage device, and report a service model type of a logical volume corresponding to the preparation capacity expansion message to the storage device.
Or, in the system, the server may include a thin provisioning client module, where the thin provisioning client module is configured to report the service model types of all the logical volumes mounted by the server to the storage device;
the storage device may be configured to, when it is detected that a logical volume meeting a capacity expansion condition exists in the system, search for a service model type of the logical volume.
An embodiment of the present invention further provides a storage device for dynamically allocating a storage space, referring to fig. 3, where fig. 3 is a schematic structural diagram of the storage device according to the embodiment of the present invention, and the storage device includes: a detection and acquisition module 301, a database module 302 and a query and expansion module 303;
the detecting and acquiring module 301 is configured to detect whether a logical volume meeting a capacity expansion condition exists in the system, and if the logical volume exists, acquire a service model type of the logical volume according to an ID of the logical volume;
the database module 302 is used for storing a resource list;
the query and expansion module 303 is configured to search a resource list stored by the database module 302 according to the ID of the logical volume or the service model type acquired by the detection and acquisition module 301, determine an RAID matched with the logical volume according to a correspondence between the ID of the logical volume in the resource list, the service model type, and the RAID, and expand the logical volume using the RAID.
In the storage apparatus, the detecting and acquiring module 301 may be configured to, when it is detected that a logical volume meeting a capacity expansion condition exists in the system, send a preliminary capacity expansion message to the server on which the logical volume is mounted according to the ID of the logical volume; and receiving the service model type of the logical volume reported by the server.
Or, the detecting and acquiring module 301 may be configured to receive and store the service model types of all mounted logical volumes reported by the server, and when it is detected that a logical volume meeting the capacity expansion condition exists in the system, search for the service model type of the logical volume.
In the storage device, the resource list may include an array resource table; the array resource table comprises the corresponding relation of array attributes, array types and IDs of the array created logical volumes;
the query and expansion module 303 may be configured to search the array resource table according to the ID of the logical volume, and determine that the RAID is a matched RAID when an available space in the array attribute of the RAID that has created the logical volume meets an expansion requirement of the logical volume.
The resource list can also comprise access control list ACL entries; ACL table entries including the corresponding relationship of the type of the business model, the type of the array and the priority;
the query and expansion module 303 may be further configured to, when the available space does not meet the expansion requirement, search an ACL entry according to the service model type of the logical volume, and determine an array type of each priority corresponding to the service model type; and searching the array resource table according to the sequence of the priority from high to low to obtain the array attribute of the RAID corresponding to the array type, determining the RAID as the matched RAID when the available space in the array attribute meets the capacity expansion requirement of the logical volume, and finishing the search of the array resource table.
Alternatively, the resource list may include an array resource list and an ACL list; the array resource table comprises the corresponding relation of array attributes, array types and IDs of the array created logical volumes; ACL table entries including the corresponding relationship of the type of the business model, the type of the array and the priority;
the query and expansion module 303 may be configured to search an ACL entry according to the service model type of the logical volume, and determine an array type of each priority corresponding to the service model type; searching the array resource table according to the sequence of the priority from high to low, obtaining the array attribute of the RAID corresponding to the array type, determining that the RAID is the matched RAID when the available space in the array attribute meets the capacity expansion requirement of the logical volume, and finishing the search of the array resource table.
In summary, the present invention improves the existing thin provisioning technology, and configures a thin provisioning client module in a server, for setting a service model type of each logical volume mounted on the server, and reporting the service model type of the logical volume to a storage device; the storage device acquires the service model type of the logical volume after detecting that the logical volume meeting the capacity expansion condition exists in the system, prestores ACL list items and array resource lists in the storage device, searches the prestore lists according to the ID or the service model type of the logical volume, determines the RAID suitable for the logical volume, and adopts the RAID to expand the capacity of the logical volume. By the method, the RAID which can meet the application service requirement can be selected for the logical volume for capacity expansion, so that the application service requirement can be met, and the storage space can be saved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (6)
1. A method for dynamically allocating memory, the method comprising:
the storage device detects whether a logical volume meeting capacity expansion conditions exists in the system, and if yes, the service model type of the logical volume is obtained according to the identification ID of the logical volume;
the storage device searches a resource list according to the ID or the service model type of the logical volume, determines the RAID matched with the logical volume, and expands the capacity of the logical volume by using the RAID;
the resource list comprises an array resource list and an ACL table item; the array resource table comprises a corresponding relation of array attributes, array types and IDs of array created logical volumes; the ACL table items comprise corresponding relations of a service model type, an array type and a priority;
the step of determining a matching RAID comprises:
searching an array resource table according to the ID of the logical volume, and determining that the RAID is a matched RAID when the available space in the array attribute of the RAID of the created logical volume meets the capacity expansion requirement of the logical volume; otherwise, searching ACL list items according to the service model type of the logical volume, determining the array type of each priority corresponding to the service model type, searching an array resource table according to the sequence of the priority from high to low, obtaining the array attribute of the RAID corresponding to the array type, determining the RAID as the matched RAID when the available space in the array attribute meets the capacity expansion requirement of the logical volume, and finishing the step of searching the array resource table;
or, directly searching ACL list items according to the service model type of the logical volume, and determining the array type of each priority corresponding to the service model type; searching an array resource table according to the sequence of the priority from high to low, obtaining the array attribute of the RAID corresponding to the array type, determining the RAID as the matched RAID when the available space in the array attribute meets the capacity expansion requirement of the logical volume, and finishing the step of searching the array resource table.
2. The method of claim 1, wherein the step of obtaining the service model type of the logical volume comprises:
the storage device sends a prepared capacity expansion message to a server mounted with the logical volume according to the ID of the logical volume;
and the server receives the prepared expansion message and reports the service model type of the logical volume to the storage device.
3. The method of claim 1, wherein the detecting further comprises, prior to: the server reports the service model types of all the logical volumes mounted by the server to the storage device;
the step of obtaining the service model type of the logical volume comprises: the storage device searches the service model type of the logical volume according to the ID of the logical volume.
4. A storage device for dynamically allocating storage space, the storage device comprising: the system comprises a detection and acquisition module, a database module and an inquiry and expansion module;
the detection and acquisition module is used for detecting whether a logical volume meeting capacity expansion conditions exists in the system or not, and if so, acquiring the service model type of the logical volume according to the ID of the logical volume;
the database module is used for storing a resource list, and the resource list comprises an array resource list and an ACL (access control list) table entry; the array resource table comprises a corresponding relation of array attributes, array types and IDs of array created logical volumes; the ACL table items comprise corresponding relations of a service model type, an array type and a priority;
the query and expansion module is used for searching a resource list stored by the database module according to the ID of the logical volume or the service model type acquired by the detection and acquisition module, determining the RAID matched with the logical volume, and expanding the capacity of the logical volume by using the RAID; the method for acquiring the matched RAID is as follows: searching an array resource table according to the ID of the logical volume, when the available space in the array attribute of the RAID of the logical volume is created to meet the capacity expansion requirement of the logical volume, determining that the RAID is a matched RAID, otherwise, searching an ACL table item according to the service model type of the logical volume, determining the array type of each priority corresponding to the service model type, searching the array resource table according to the sequence of the priority from high to low to obtain the array attribute of the RAID corresponding to the array type, when the available space in the array attribute meets the capacity expansion requirement of the logical volume, determining that the RAID is the matched RAID, and finishing the search of the array resource table; or, directly searching ACL list items according to the service model type of the logical volume, and determining the array type of each priority corresponding to the service model type; searching the array resource table according to the sequence of the priority from high to low, obtaining the array attribute of the RAID corresponding to the array type, determining the RAID as the matched RAID when the available space in the array attribute meets the capacity expansion requirement of the logical volume, and finishing the search of the array resource table.
5. The storage device according to claim 4, wherein the detecting and acquiring module is configured to, when it is detected that a logical volume satisfying a capacity expansion condition exists in the system, send a preliminary capacity expansion message to a server on which the logical volume is mounted according to an ID of the logical volume; and receiving the service model type of the logical volume reported by the server.
6. The storage device according to claim 4, wherein the detecting and acquiring module is configured to receive and store the service model types of all mounted logical volumes reported by the server, and when it is detected that a logical volume meeting a capacity expansion condition exists in the system, search for the service model type of the logical volume.
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| CN113064557A (en) * | 2021-04-29 | 2021-07-02 | 中国工商银行股份有限公司 | Storage capacity expansion method, device, equipment and storage medium for open platform |
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