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Diffstat (limited to 'unit4/unit4.typ')
| -rw-r--r-- | unit4/unit4.typ | 44 |
1 files changed, 43 insertions, 1 deletions
diff --git a/unit4/unit4.typ b/unit4/unit4.typ index 7072193..77a1331 100644 --- a/unit4/unit4.typ +++ b/unit4/unit4.typ @@ -42,7 +42,7 @@ This layer also specifies the entities that operate in this layer: 2. Resource Pools 3. Virtual resources = Process and Operations -The key steps involved in making resources available to comsumers are: +The key steps involved in making resources available to consumers are: 1. Deploying virtualization software. - Compute systems. - Network devices. @@ -163,3 +163,45 @@ _An identity pool, unlike a resource pool, specifies a range of network identifi - If it runs out of IDs, then administrators may create an additional pool or add more identities to the existing pool. - 1-to-1 mapping between identity pool and service simplifies the tracking and use of IDs by a particular service. - Increases management complexity as multiple identity pools must be created and managed. += Virtual Resources +== Virtual Machine +_A logical compute system that, like a physical compute system, runs an OS and applications._\ +- Created by hosted or bare-metal hypervisor installed on physical compute. +- Has self-contained OS, applications, virtual hardware. +- 'Guest' OS is installed on a VM the same way it is installed on physical compute. +- From 'guest' perspective, VM appears to be a physical compute. +- Virtual Machine Monitor (VMM) is responsible for execution of VM. +- Each VM has dedicated VMM and configuration for hardware, software, network, etc. +- Does not have direct access to host OS or hardware. +- Hypervisor translates virtual VM requests and maps virtual hardware to physical hardware. +- Compute virtualization software enables creating and managing several VMs on a physical compute or compute cluster. +- Providers provision VMs to consumers to deploy applications. +- VM hardware and software are configured to meet requirements. +- Consumer VMs are isolated from each other so there is no interference. +- Isolation also provides fault tolerance. +== VM Hardware +_When a VM is created, it is presented with virtual hardware components that appear as physical hardware components to the guest OS._\ +- Within vendor's environment, each VM has standardized hardware components, so they are portable. +- Based on requirements, virtual components can be added or removed. +- However some components are part of the virtual motherboard and cannot be removed. +- Can be configured with one more virtual processors. This number can later be changed. +- When a VM starts, it's virtual processors are scheduled by the hypervisor kernal to run on physical processors. +- Each VM is assigned a virtual motherboard with standardized devices necessary for compute to function. + 1. *Virtual RAM* is the amount of physical memory allocated to the VM. + 2. *Virtual Disk* is a large physical file, or a set of files. + 3. *Virtual Network Adapter* provides connectivity to VMs running on same or different compute or VM and compute. + 4. *Virtual optical or floppy drives* can be configured to connect to physical drives or to image files. + 5. *SCSI/IDE virtual controllers* provide a way for VMs to connect to storage devices. + 6. *Virtual USB controller* is used to connect to a physical USB controller to access storage and devices. +== VM Files +#table( + columns: (auto, auto), + table.header([ File ], [ Description ]), + [ Configuration File ], [ Stores information such as VM name, BIOS information, guest OS type, memory size. ], + [ Virtual Disk File ], [ Stores contents of VM's disk drive. ], + [ Memory State File ], [ Stores the memory contents of a VM in a suspended state. ], + [ Snapshot File ], [ Stores the VM settings and virtual disk of a VM. ], + [ Log File ], [ Keeps log of the VM's activity and is used for troubleshooting. ] +) +== File system to manage VM Files +// Start with slide 25 |