JPH09212426A - Storage device managing method for virtual computer system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify main storage management for a virtual computer. SOLUTION: A real storage device 120 is provided which appears to be N times (N: number of virtual computers) as large as a real storage device 110, and virtual computer numbers are made to correspond to the high-order parts of addresses. A management program 102 in a control program 100 manages the apparent real storage start addresses corresponding to the virtual storages of the respective virtual computers. When the virtual storage of a virtual computer 1 is made resident on the real storage device 110, the management program 102 passes the apparent real storage start address and necessary storage capacity of the virtual computer 1 to a control part 105. The control part 105 when allocating the virtual storage of the virtual computer 1 to the real storage device 110 registers its address in a variable address register 130 on the basis of the said start address.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a storage device management method in a virtual computer system, and more particularly to managing main storage devices for virtual computers by having virtual real storage devices for the number of virtual computers in the real storage device. To simplify.

[0002]

2. Description of the Related Art A virtual computer is realized by allocating and simulating processor resources by a virtual computer control program (hereinafter simply referred to as a control program).
In FIG. 2, there are three virtual computers, and the virtual storage devices of the three virtual computers 1, 2, and 3 (main storage device of the virtual computer).
Is an example in which three areas are distributed to three continuous areas of the real storage device (main storage device of the real computer) 110.

Conventionally, as shown in FIG. 2, three virtual computers 1,
After distributing a few virtual storage devices to the continuous area of the real storage device 110, for example, the virtual storage device of the virtual computer 3 is separated from the real storage device 110, and the area and the area originally allocated to the virtual computer 1 are separated. When allocating as a continuous area to the virtual storage device of the virtual computer 1,
As shown in FIG. 3, a virtual real storage device (a virtual computer several times as large as the real computer) 120 is provided, and the virtual storage device of the virtual computer 1 is provided in a continuous area of the virtual real storage device 120. Was assigned. In this case, in order to make the area assigned to the virtual real storage device 120 correspond to the area of the real storage device 110, the real storage device 11
0 and the virtual real storage device 120 are divided in the same area unit (block), and the area allocated to the virtual real storage device 120 and the real storage device 110 are used for each area unit by using the conversion device 140. Corresponds to the real area of. As a result, the discontinuous area of the real storage device 110 can be allocated to the virtual storage device of the virtual machine as a continuous area.

As a known document related to this type of technique, for example, Japanese Patent Laid-Open No. 2-333639 can be cited.

[0005]

In the above-described storage device management method for virtual computer systems of the prior art, the control program is aware of which area of the virtual storage device the virtual storage device is to be allocated to, and also the real storage device. There was a problem that we had to be aware of the total capacity of the system. For example,
As shown in FIG. 3, in order to increase the area of the virtual storage device of the virtual computer 1 and allocate it to the contiguous area of the virtual real storage device, it is necessary to change the start address thereof, so that processing must also be performed. did not become.

It is an object of the present invention to identify a virtual computer when allocating the virtual storage device of the virtual computer to the real storage device without being aware of where the control program allocates the real storage device area or the apparent real storage area. And it is to be able to process at high speed only by considering the capacity of the real storage device.

[0007]

According to the present invention, in a virtual computer system capable of running a maximum of N virtual computers at the same time and resident any virtual storage device on the real storage device, a real storage device is provided. The number of virtual machines is multiplied by the number of virtual machines (capacity of real storage device × N) to make the virtual storage device have the virtual address, and the upper address of the virtual storage device is used as the virtual computer number. The virtual real memory device has N times the absolute address as compared with the real address of the real memory device. An address obtained by adding a virtual computer number to a higher-order portion of the real address of the real storage device (a portion representing a higher value than the highest value of the real storage device) is an absolute address of the virtual storage device of the virtual computer (a virtual real storage device Use as an absolute address). As a result, the virtual storage device of each virtual computer is always fixedly assigned to the virtual storage device corresponding to the virtual computer number, and the virtual storage device of the virtual computer is allocated to the virtual storage device. The process of assigning to is simplified.

[0008]

FIG. 1 is a schematic block diagram showing an embodiment of the present invention. In the figure, 110 is a real storage device (main storage device of a real computer), which is composed of a plurality of areas (blocks). Here, one area size is q,
The number of areas is m. Reference numeral 112 denotes an address of the real storage device 110, and here it is assumed to be (000) _HEX to (FFF) _HEX . 120 is a virtual real storage device,
In the same q area size unit as the real storage device 110, it has a virtual real storage device area that is twice the number of virtual machines (N times) as the real storage device 110. Here, it is assumed that the three virtual computers 1, 2, and 3 shown in FIG. 2 exist, and the area of the apparent real storage device 120 is three times (3 × m × q) that of the real storage device 110. Reference numeral 122 denotes an apparent address of the real storage device 120, which is configured by adding a virtual computer number to the higher order of the address of the real storage device 110. As a result, the address (100
0) _HEX to (1FFF) _HEX is the virtual storage device of virtual computer 1, address (2000) _HEX to (2FFF) _HEX is the virtual storage device of virtual computer 2, and address (3000) _HEX
~ (3FFF) _HEX is a virtual storage device of virtual machine 3,
Each is fixedly assigned.

Reference numeral 130 denotes a variable address register, which is a virtual storage device of a virtual computer resident in the real storage device 110.
0 is associated with each q region size. The variable address register 130 is used for the virtual real storage device 12
When a virtual storage device of a certain virtual machine is provided corresponding to each area of 0 and is assigned to the real storage device 110, the address of the real storage device 110 (corresponding to q
The start address of the area) is registered.

Reference numeral 100 denotes a control program for controlling the virtual computer, which has a built-in program (hereinafter, simply referred to as a management program) 102 for managing a virtual storage device of the virtual computer. Here, the management program 102, as the virtual storage devices of the virtual machines 1, 2, and 3, starts the start address (1
000) _HEX , (2000) _HEX , and (3000) _HEX are managed. Reference numeral 105 denotes a storage device management control unit that controls and manages the correspondence between the apparent real storage device 120 and the real storage device 110 in response to a request from the control program 100.
A table (real storage device usage status table) 107 for managing the usage status of the real storage device 110 is provided. The real storage device usage status table 107 manages the current usable capacity (empty capacity) of the entire real storage device 110 and the used / empty state for each area (q area size unit).

In the following, as a processing example, the virtual computer 2 has already been used.
The virtual storage device of is resident in the real storage device 110,
A case where the virtual storage device of the virtual computer 1 is made resident on the real storage device 110 will be described. The required capacity of the virtual storage device of the virtual computer 1 is X (unit of q area size).
And

The control program 100 is the management program 1.
02, the management program 102 requests the storage device management control unit 105 to allocate a virtual storage device for X capacity to the virtual computer 1 (starting address of the virtual real storage device of the virtual computer 1 ( 1000) _{Send HEX} and requested capacity X and request allocation control. Upon receipt of the request, the storage device management control unit 105 refers to the real storage device usage status table 107 and first determines whether or not the currently usable capacity (empty capacity) in the real storage device 110 is equal to or greater than the requested X capacity. Check if the available capacity is more than X capacity,
Next, each area of the real storage device 110 (q area size unit)
The in-use / empty state of each is checked, and an empty area for the requested X capacity is selected. Then, from the start address (1000) _{HEX of} the real storage device corresponding to the virtual computer 1 of the virtual real storage device 120, for each X area and q area size, the above-mentioned selection is made to the corresponding register group of the variable address register 130. The address (start address) of each empty area of the real storage device 110 is registered. Thereafter, the storage device management control unit 105 reduces the current usable capacity of the real storage device 110 by X capacity in the real storage device usage status table 107, and changes the state of the selected area from empty to in use, The allocation completion is returned to the management program 102.

On the other hand, the storage device management control unit 105 refers to the real storage device usage status table 107, and if the currently usable area in the real storage device 110 is less than the requested X capacity, a response indicating that allocation is impossible. Is returned to the management program 102. Also, the start address (1000) _{HEX of} the real storage device corresponding to the virtual computer 1 of the virtual real storage device 120
Even if the corresponding register group of the variable address register 130 has already been used for the X capacity from (i.e., the case where the real storage device is already assigned to the phantom real storage device), the storage device management control unit 105 Returns a response indicating that the allocation is impossible to the management program 102.

Usually, the program 100 is stored in the real storage device 1.
With respect to the virtual storage device of the virtual computer resident on 10, the virtual computer is controlled by the virtual real storage device address of the virtual computer. For example, when the virtual storage device of the virtual computer 1 is assigned to the real storage device 110,
The control program 100 controls the virtual computer 1 by designating the virtual real storage device address (1 ×××) _HEX of the virtual computer 1 (the upper address “1” corresponds to the number of the virtual computer 1). . At this time, the storage device management control unit 10
In 5, the pseudo real storage device address (1 ×××)
_{The HEX} refers to the corresponding register of the variable address register 130 to obtain the address of the area allocated on the real storage device 110.

When there is a request to release the allocated area on the real storage device 110, the storage device management control unit 10
5 adds the current usable capacity of the real storage device usage status table 107 by the release request capacity, and
The state of the corresponding area of 0 is made empty, and the corresponding register of the variable address register 130 is invalidated.

[0016]

According to the present invention, the virtual main memory of the virtual machine is assigned to the virtual real memory of the virtual machine by fixed allocation and management on the virtual real memory of the virtual machine. Must be allocated and where in real storage should it be allocated?
The virtual storage device of the virtual computer can be assigned to an arbitrary area of the real storage device by simply specifying the virtual computer number and the required capacity without being aware of the control program.

[Brief description of drawings]

FIG. 1 is a schematic block diagram showing an embodiment of the present invention.

FIG. 2 is a diagram showing a correspondence between a virtual computer and a real storage device.

FIG. 3 is a schematic block diagram illustrating allocation of a conventional virtual storage device to a real storage device.

[Explanation of Codes] 100 Control Program 102 Management Program 105 Storage Device Management Control Unit 107 Real Storage Device Usage Status Table 110 Real Storage Device 112 Real Storage Device Address 120 Pseudo Real Storage Device 122 Pseudo Real Storage Device Address 130 Variable Address Register

Claims (2)

[Claims] 1. A virtual computer system capable of running a maximum of N virtual computers at the same time, and making a virtual storage device of an arbitrary virtual computer resident in one or a plurality of indefinite length areas on a real storage device. In the storage device management method, a virtual real storage device having a size N times as large as that of the real storage device is provided, and the virtual storage devices of N virtual computers are fixedly assigned to the virtual real storage device, A storage device management method for a virtual computer system, comprising: managing a virtual storage device of a virtual computer resident in the storage device. 2. The storage of a virtual computer system according to claim 1, wherein a virtual computer number is made to correspond to an upper part of an address indicating a virtual real storage device. Device management method.