(B13) Storage and Backup Part6 Virtual Hard Disk -vhd, vhdx,fixed disk,dynamically expanding
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Virtual Hard Disks:
-stores in Physical storage
-used to store data,OS,application
-connect to Virtual machines
-access data in virtual hard disk from physical machine and virtual machine
-we can move or copy virtual hard disk from on system to other, one location to other
Formats:
Microsoft:
.vhd - support upto 2TB (2040 GB) virtual hard disk
.vhdx - support more than 2TB and upto 64TB
(win 8)
VMWare:
.vmdk
Linux - Qemu/KVM (virtualization plotform/hypervisor)
.QCOW2
Types:
#Fixed disk
-The Virtual hard disk file is allocated to its
maximum size when the virtual hard disk is created
#Dynamically expanding
-The virtual hard disk file grows to its maximum size
as data is written to the virtual hard disk
ex. ballon, bag..
#Differencing -Hyper-V , Parent and child disk
-Create a virtual hard disk , and put data in it take it as parent disk or reference disk
-create child disks as per require on parent disk
-data in parent disk shows in child disk
-if you modify/change , delete data in a child disk , it is not effect on parent and other child disks also
this concept also use in
--Snapshot of virtual hard disk, Virtual Machine
--Snapshot -- Checkpoint
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Thin provisioning - dynamically expanding
Thick Provisioning - fixed disk
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