Backing up method, device, and system for virtual machine

• US 9,250,824 B2
• Filed: 10/24/2013
• Issued: 02/02/2016
• Est. Priority Date: 11/12/2012
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: Qin, Zufu
• Primary Examiner(s): Alrobaye, Idriss N
• Assistant Examiner(s): Franklin, Richard B
• Application Number:
  US14/062,669
• Publication Number:
  US 20140136803A1
• Time in Patent Office: 831 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: G06F 11/00 Error detection; Error correction; Monitoring error detection, correction or monitoring in information storage based on relative movement between record carrier and transducer G11B20/18; monitoring, i.e. supervising the progress of recording or reproducing G11B27/36; in static stores G11C29/00
• CPC Class Codes: G06F 11/1451 by selection of backup contents
• CPC Class Codes: G06F 11/1456 Hardware arrangements for backup
• CPC Class Codes: G06F 11/1458 Management of the backup or restore process
• CPC Class Codes: G06F 2201/815 Virtual middleware or OS functionality using virtual machines to implement generic software techniques for error detection or fault masking G06F11/1484
• CPC Class Codes: G06F 2201/84 Using snapshots, i.e. a logical point-in-time copy of the data
• CPC Class Codes: G06F 3/0604 Improving or facilitating administration, e.g. storage management
• CPC Class Codes: G06F 3/065 Replication mechanisms
• CPC Class Codes: G06F 3/0683 Plurality of storage devices

Abstract

Embodiments of the present disclosure provide a backing up method, device, and system for a virtual machine. The backing up method for a virtual machine includes a backup server mounting a snapshot initial volume of a to-be-backed-up original volume of a virtual machine in a primary storage device to the backup server, creating an initialization backup volume on a backup storage device and mounting the initialization backup volume to the backup server, and backing up an original data block of the original volume to the initialization backup volume.

Claims

1. A backing up method for a virtual machine, the method comprising:

mounting, by a backup server, a snapshot initial volume of an original volume of a virtual machine in a primary storage device to the backup server;

creating, by the backup server, an initialization backup volume on a backup storage device, and mounting the initialization backup volume to the backup server; and

backing up, by the backup server, an original data block of the original volume to the initialization backup volume;

after the mounting, creating, by the backup server, a snapshot resource pool on the backup storage device, mounting the snapshot resource pool to the backup server, acquiring a first checking table of the snapshot initial volume, and storing the first checking table into the snapshot resource pool, wherein the first checking table is used to record a check value of each original data block in the original volume; and

after the backing up, mounting, by the backup server, a snapshot volume of an N^th updated original volume to the backup server, acquiring an N^th checking table of the snapshot volume of the N^th updated original volume, comparing the N^th checking table with the first checking table to obtain an N^th difference checking table, acquiring an N^th updated data block corresponding to the N^th difference checking table from the N^th updated original volume, and storing the N^th checking table, the N^th difference checking table, and the N^th updated data block into the snapshot resource pool to complete an N^th backup, wherein N is an integer and N>

1, the N^th checking table is used to record a check value of each data block in the N^th updated original volume, and the N^th difference checking table is used to record a check value that differs in the N^th checking table and the first checking table.

2. The backing up method according to claim 1, further comprising:

mounting, by the backup server, a new storage volume created by the primary storage device to the backup server, acquiring an M^th checking table of an M^th backup and the first checking table from the snapshot resource pool, acquiring an original data block corresponding to a check value that is the same in the M^th checking table and in the first checking table from the initialization backup volume, acquiring an M^th updated data block from the snapshot resource pool, and recovering the acquired original data block and the acquired M^th updated data block into the new storage volume, so that the primary storage device is recovered to an M^th updated state, wherein M is an integer and 1<

M≦

N.

3. The backing up method according to claim 1, further comprising:

increasing capacity of the snapshot resource pool according to a preset capacity expansion rule when the backup server detects that the snapshot resource pool is full.

4. The backing up method according to claim 1, wherein the first checking table is a message-digest algorithm MD5 checking table.

5. The backing up method according to claim 1, further comprising:

after the backing up, mounting, by the backup server, a snapshot volume of an I^th updated original volume to the backup server, acquiring an I^th checking table of the snapshot volume of the I^th updated original volume, comparing the I^th checking table with an (I−

1)^th checking table to obtain an I^th difference checking table, acquiring an I^th updated data block corresponding to the I^th difference checking table from the I^th updated original volume, and storing the I^th checking table, the I^th difference checking table, and the I^th updated data block into the snapshot resource pool to complete an I^th backup, wherein I is an integer and I>

1, the I^th checking table is used to record a check value of each data block in the I^th updated original volume, and the I^th difference checking table is used to record a check value that differs in the I^th checking table and the (I−

1)^th checking table.

6. The backing up method according to claim 5, further comprising:

mounting, by the backup server, a new storage volume created by the primary storage device to the backup server, acquiring the first checking table and a second checking table from the snapshot resource pool, acquiring an original data block corresponding to a check value that is the same in the second checking table and in the first checking table from the initialization backup volume, acquiring a second updated data block from the snapshot resource pool, and forming second backup data from the acquired original data block and the acquired second updated data block; and

acquiring, by the backup server, a j^th difference checking table and a j^th updated data block from the snapshot resource pool, updating (j−

1)^th backup data according to the j^th difference checking table and the j^th updated data block to obtain j^th backup data, repeating this step till J^th backup data is obtained, and recovering the J^th backup data into the new storage volume, so that the primary storage device is recovered to a J^th updated state, wherein J is an integer, 2<

J≦

S, j is an integer, and 2<

j≦

J.

7. The backing up method according to claim 1, further comprising, after the backing up, unmounting, by the backup server, the snapshot initial volume.

8. A backup server comprising:

a first processing unit, configured to mount a snapshot initial volume of an original volume of a virtual machine in a primary storage device to the backup server;

a second processing unit, configured to create an initialization backup volume on a backup storage device, and mount the initialization backup volume to the backup server; and

an initial backup unit, configured to back up an original data block of the original volume to the initialization backup volume;

a third processing unit, configured to create a snapshot resource pool on the backup storage device, mount the snapshot resource pool to the backup server, acquire a first checking table of the snapshot initial volume, and store the first checking table into the snapshot resource pool, wherein the first checking table is used to record a check value of each original data block in the original volume; and

a first update backup unit, configured to mount a snapshot volume of an N^th updated original volume to the backup server, acquire an N^th checking table of the snapshot volume of the N^th updated original volume, compare the N^th checking table with the first checking table to obtain an N^th difference checking table, acquire an N^th updated data block corresponding to the N^th difference checking table from the N^th updated original volume, and store the N^th checking table, the N^th difference checking table, and the N^th updated data block into the snapshot resource pool to complete an N^th backup, wherein N is an integer and N>

1, the N^th checking table is used to record a check value of each data block in the N^th updated original volume, and the N^th difference checking table is used to record a check value that differs in the N^th checking table and the first checking table.

9. The backup server according to claim 8, further comprising:

a first recovering unit, configured to mount a new storage volume created by the primary storage device to the backup server, acquire an M^th checking table of an M^th backup and the first checking table from the snapshot resource pool, acquire an original data block corresponding to a check value that is the same in the M^th checking table and in the first checking table from the initialization backup volume, acquire an M^th updated data block from the snapshot resource pool, and recover the acquired original data block and the acquired M^th updated data block into the new storage volume, so that the primary storage device is recovered to an M^th updated state, wherein M is an integer and 1<

M≦

N.

10. The backup server according to claim 8, further comprising:

a fourth processing unit, configured to create a snapshot resource pool on the backup storage device, mount the snapshot resource pool to the backup server, acquire a first checking table of the snapshot initial volume, and store the first checking table into the snapshot resource pool, wherein the first checking table is used to record a check value of each original data block in the original volume; and

a second update backup unit, configured to mount a snapshot volume of an I^th updated original volume to the backup server, acquire an I^th checking table of the snapshot volume of the I^th updated original volume, compare the I^th checking table with an (I−

1)^th checking table to obtain an I^th difference checking table, acquire an I^th updated data block corresponding to the I^th difference checking table from the I^th updated original volume, and store the I^th checking table, the I^th difference checking table, and the I^th updated data block into the snapshot resource pool to complete an I^th backup, wherein I is an integer and I>

1, the I^th checking table is used to record a check value of each data block in the I^th updated original volume, and the I^th difference checking table is used to record a check value that differs in the I^th checking table and the (I−

1)^th checking table.

11. The backup server according to claim 10, further comprising:

a second recovering unit, configured to mount a new storage volume created by the primary storage device to the backup server, acquire the first checking table and a second checking table from the snapshot resource pool, acquire an original data block corresponding to a check value that is the same in the second checking table and in the first checking table from the initialization backup volume, acquire a second updated data block from the snapshot resource pool, and form second backup data from the acquired original data block and the acquired second updated data block; and

acquire a j^th difference checking table and a j^th updated data block from the snapshot resource pool, update (j−

1)^th backup data according to the j^th difference checking table and the j^th updated data block to obtain j^th backup data, repeat this step till J^th backup data is obtained, and recover the J^th backup data into the new storage volume, so that the primary storage device is recovered to a J^th updated state, wherein J is an integer, 2<

J≦

S, j is an integer, and 2<

j≦

J.

12. The backup server according to claim 11, further comprising:

a capacity expansion unit, configured to increase capacity of the snapshot resource pool according to a preset capacity expansion rule when it is detected that the snapshot resource pool is full.

13. The backup server according to claim 8, further comprising an unmounting unit, configured to unmount the snapshot initial volume.

14. A backing up system for a virtual machine, comprising:

a primary storage device;

a backup storage device; and

a backup server, the backup server configured to;

mount a snapshot initial volume of an original volume of a virtual machine in the primary storage device to the backup server;

create an initialization backup volume on the backup storage device, and mount the initialization backup volume to the backup server;

back up an original data block of the original volume to the initialization backup volume;

after the mounting, create a snapshot resource pool on the backup storage device, mount the snapshot resource pool to the backup server, acquire a first checking table of the snapshot initial volume, and store the first checking table into the snapshot resource pool, wherein the first checking table is used to record a check value of each original data block in the original volume; and

after the backing up, mount a snapshot volume of an N^th updated original volume to the backup server, acquire an N^th checking table of the snapshot volume of the N^th updated original volume, compare the N^th checking table with the first checking table to obtain an N^th difference checking table, acquire an N^th updated data block corresponding to the N^th difference checking table from the N^th updated original volume, and store the N^th checking table, the N^th difference checking table, and the N^th updated data block into the snapshot resource pool to complete an N^th backup, wherein N is an integer and N>

1, the N^th checking table is used to record a check value of each data block in the N^th updated original volume, and the N^th difference checking table is used to record a check value that differs in the N^th checking table and the first checking table.