Snapshot management method for logic disk
A logical disk and management method technology, which is applied in the field of logical disk snapshot backup management, can solve the problems of reducing backup speed, increasing the risk of failure, and increasing the usage of snapshots, so as to avoid efficiency reduction and save storage space.
Inactive Publication Date: 2008-12-31
XUZHOU LIFANG MECHANICAL & ELECTRICAL EQUIP MFG CO LTD
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Therefore, on the one hand, when the logical disk is written, multiple snapshots will be written, which will reduce the backup speed, thus affecting the efficiency of logical disk data backup; The time is independent of each other, and there will be a lot of duplication of snapshot data at different time points, so the usage of each snapshot is increased, and the space usage of the overall snapshot is also increased, which increases the risk of failure
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[0045] The features and examples of the present invention will be described in detail as follows with reference to the accompanying drawings for the best embodiments.
[0046] Before describing the snapshot management method of the logical disk manager of the present invention, a known snapshot backup method will be described first with reference to the accompanying drawings.
[0047] Fig. 1 is a schematic diagram of the data address and data content of the logical disk that is about to write data at different points in time; Fig. 2a is a schematic diagram of the first snapshot at different points in time according to the snapshot backup method of the known technology; Fig. 2b is a schematic diagram according to the known technology A schematic diagram of the second snapshot of the snapshot backup method of the technology at different time points; FIG. 2c is a schematic diagram of the third snapshot according to the snapshot backup method of the known technology; and FIG. 3 is ...
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A snapshot management method of a logical disk manager. When there is a data write request, the logical disk is used to create a plurality of snapshots corresponding to different time points, and the address of the data to be written in the logical disk is searched, and then the The copy operation corresponds to the snapshot at the last point in time, and backs up the data under the data address of the logical disk to which data is to be written. When there is a snapshot read request, determine whether there is a requested data address in the snapshot corresponding to the read request. If there is no requested data address and the corresponding time point of the snapshot is not the last time point, look backward for the data that is later than the corresponding time point of the snapshot. Multiple snapshots, and read the snapshot data under the requested data address. The invention can realize the high-speed backup function of the snapshot, and save the storage space capacity of the snapshot.
Description
technical field [0001] The invention relates to a logical disk management method, in particular to a logical disk snapshot backup management method. Background technique [0002] Logical Volume Manager (LVM) is a method of dividing hard disk space into "elastic" logical disks. Using LVM technology, hard disks can be simply resized without repartitioning. LVM brings us the flexibility of disk management. The flexibility of LVM is also reflected in the fact that several physical disks and partitions of different types and sizes can be formed into multiple logical disks (Logical Volumes, LV), that is, virtual partitions for management. Compared with traditional disks and partitions, LVM provides computers with a higher level of disk storage. Multiple partitions of a hard disk are managed by LVM as a disk group. The storage disk under LVM management can change the size of the partition and remove it at any time as needed, so as to expand or reduce the available capacity of th...
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IPC IPC(8): G06F12/00G06F12/16G11B20/10G11B5/00G11B5/86
Inventor 陈蕴弘陈玄同刘文涵
Owner XUZHOU LIFANG MECHANICAL & ELECTRICAL EQUIP MFG CO LTD