Storage device sharing among virtual machines
Disclosed herein are various systems, methods, and processes for sharing a storage device with multiple virtual machines. A pseudo-identity is created for a storage device. Information in a hypervisor is configured to modify a response to a command issued to the storage device by a virtual machine. Physical characteristics of the storage device are determined and it is also determined whether the physical characteristics are acceptable. If the physical characteristics are acceptable, a virtual disk associated with the virtual machine is used. If the physical characteristics are unacceptable, a mapping of the virtual machine is migrated to another storage device.
1. A computer-implemented method comprising:
receiving a response to a command, wherein
the command is issued by a virtual machine,
the response to the command is issued by a physical storage device, and
the response to the command is received by a hypervisor;
modifying the response to the command to create a modified response, wherein
the modifying is performed by the hypervisor,
the modified response is configured to include a pseudo-identity associated with the physical storage device, and
the pseudo-identity facilitates
access to the physical storage device by a virtual machine of a plurality of virtual machines associated with a hypervisor, and
presentation of one or more physical characteristics of the physical storage device to the virtual machine; and
transmitting the modified response to the virtual machine.
2. The computer-implemented method of claim 1 , wherein
the command is a read-capacity command,
modifying the response to the command comprises replacing an actual read-capacity value with a modified read-capacity value,
the actual read-capacity value is provided by the physical storage device, and
the modified read-capacity value is determined by the hypervisor.
3. The computer-implemented method of claim 2 , wherein
the modifying the response to the command further comprises assigning an address space of the physical storage device to the virtual machine,
the address space is associated with the modified read-capacity value, and
the address space is assigned by the hypervisor.
4. The computer-implemented method of claim 1 , wherein
the hypervisor is communicatively coupled to a plurality of virtual machines,
the plurality of virtual machines comprises the virtual machine and a second virtual machine,
the hypervisor is configured to present the physical storage device to a first virtual machine as having a first capacity and to present the physical storage device to the second virtual machine as have a second capacity, and
the first capacity is different than the second capacity.
5. The computer-implemented method of claim 1 , wherein
the hypervisor further comprises a first dynamic multi-pathing device and a second dynamic multi-pathing device,
the first dynamic multi-pathing device is coupled to the physical storage device,
the second dynamic multi-pathing device is coupled to a second physical storage device,
the hypervisor, the first dynamic multi-pathing device, and the second dynamic multi-pathing device are each configured to balance a plurality of input/output commands received from the virtual machine, and
the plurality of input/output commands are balanced across a plurality of available paths.
6. The computer-implemented method of claim 1 , wherein
the pseudo-identity associated with the physical storage device spans the physical storage device and at least one other physical storage device.
7. The computer-implemented method of claim 6 , wherein
the physical storage device and the at least one other physical storage device are provided by different vendors.
8. A hypervisor, wherein
the hypervisor is communicatively coupled to a virtual machine and a physical storage device,
the hypervisor comprises a pseudo-identity module, and
the hypervisor is configured to perform a method comprising
receiving a response to a command, wherein
the command is issued by a virtual machine, and
the response to the command is issued by the physical storage device,
modifying the response to the command to create a modified response, wherein
the modifying is performed by the pseudo-identity module,
the modified response is configured to include a pseudo-identity associated with the physical storage device, and
the pseudo-identity facilitates
access to the physical storage device by a virtual machine of a plurality of virtual machines associated with a hypervisor, and
presentation of one or more physical characteristics of the physical storage device to the virtual machine, and
transmitting the modified response to the virtual machine.
9. The hypervisor of claim 8 , wherein
the hypervisor further comprises a read-capacity module,
the command is a read-capacity command,
modifying the response to the command comprises replacing an actual read-capacity value with a modified read-capacity value,
the actual read-capacity value is provided by the physical storage device, and
the modified read-capacity value is determined by the read-capacity module of the hypervisor.
10. The hypervisor of claim 9 , wherein
the hypervisor further comprises an address space module,
modifying the response to the command further comprises assigning an address space of the physical storage device to the virtual machine,
the address space is associated with the modified read-capacity value, and
the address space is assigned by the address space module of the hypervisor.
11. The hypervisor of claim 8 , wherein
the hypervisor is communicatively coupled to a plurality of virtual machines,
the plurality of virtual machines comprises the virtual machine and a second virtual machine,
the hypervisor is configured to present the physical storage device to a first virtual machine as having a first capacity and to present the physical storage device to the second virtual machine as have a second capacity, and
the first capacity is different than the second capacity.
12. The hypervisor of claim 8 , wherein
the hypervisor further comprises a first dynamic multi-pathing device and a second dynamic multi-pathing device,
the first dynamic multi-pathing device is coupled to the physical storage device,
the second dynamic multi-pathing device is coupled to a second physical storage device,
the hypervisor, the first dynamic multi-pathing device, and the second dynamic multi-pathing device are each configured to balance a plurality of input/output commands received from the virtual machine, and
the plurality of input/output commands are balanced across a plurality of available paths.
13. The hypervisor of claim 8 , wherein
the pseudo-identity associated with the physical storage device spans the physical storage device and at least one other physical storage device.
14. The hypervisor of claim 13 , wherein
the physical storage device and the at least one other physical storage device are provided by different vendors.
15. A system comprising:
one or more processors; and
a memory coupled to the one or more processors, wherein the memory stores program instructions executable by the one or more processors to perform a method comprising
receiving a response to a command, wherein
the command is issued by a virtual machine,
the response to the command is issued by a physical storage device, and
the response to the command is received by a hypervisor,
modifying the response to the command to create a modified response, wherein
the modifying is performed by the hypervisor,
the modified response is configured to include a pseudo-identity associated with the physical storage device, and
the pseudo-identity facilitates
access to the physical storage device by a virtual machine of a plurality of virtual machines associated with a hypervisor, and
presentation of one or more physical characteristics of the physical storage device to the virtual machine, and
transmitting the modified response to the virtual machine.
16. The system of claim 15 , wherein
the command is a read-capacity command,
the modifying the response to the command comprises replacing an actual read-capacity value with a modified read-capacity value,
the actual read-capacity value is provided by the physical storage device, and
the modified read-capacity value is determined by the hypervisor.
17. The system of claim 16 , wherein
the modifying the response to the command further comprises assigning an address space of the physical storage device to the virtual machine,
the address space is associated with the modified read-capacity value, and
the address space is assigned by the hypervisor.
18. The system of claim 15 , wherein
the hypervisor is communicatively coupled to a plurality of virtual machines,
the plurality of virtual machines comprises the virtual machine and a second virtual machine,
the hypervisor is configured to present the physical storage device to a first virtual machine as having a first capacity and to present the physical storage device to the second virtual machine as have a second capacity, and
the first capacity is different than the second capacity.
19. The system of claim 15 , wherein
the hypervisor further comprises a first dynamic multi-pathing device and a second dynamic multi-pathing device,
the first dynamic multi-pathing device is coupled to the physical storage device,
the second dynamic multi-pathing device is coupled to a second physical storage device,
the hypervisor, the first dynamic multi-pathing device, and the second dynamic multi-pathing device are each configured to balance a plurality of input/output commands received from the virtual machine, and
the plurality of input/output commands are balanced across a plurality of available paths.
20. The system of claim 15 , wherein
the pseudo-identity associated with the physical storage device spans the physical storage device and at least one other physical storage device, and
the physical storage device and the at least one other physical storage device are provided by different vendors.