VMware Virtual Disk Development Kit - VMware Communities

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Virtual Disk Types 6 Virtual Disk Types Flat Simplest Fastest access Some metadata (Geometry, Id …) Raw disk sector data File size on host slightly more than the size of disk that it represents Can either be one file (monolithic) or multiple (2GB size each) files to accommodate older file systems (split) Sparse Contain all the sectors that were ever written to this disk Size on host is slightly more than the initialized data Slower access Can be split Raw Disk Mapping (RDM) Use a physical disk as backing Can be in either Physical or Virtual compatibility mode Both Workstation and ESX server support these types Formats slightly different
Parent and Child Disks 7 VI client / WS UI shows this file name I/O Path disk1-000002.vmdk Read Path Parent file name hint All guest I/O starts from here – Hypervisor opens this in read-write mode disk1-000001.vmdk Read Path Parent file name hint Base disk disk1.vmdk These files satisfy read-requests. Hypervisor opens them read-only.
Page 1 and 2: VMware Virtual Disk Development Kit
Page 3 and 4: Hard Disk terminology - A brief rec
Page 5: Virtual Disk 5 Abstraction that rep
Page 9 and 10: Why VDDK 9 VMDK format public but w
Page 11 and 12: VixDiskLib API descriptions 11 Prog
Page 13 and 14: VDDK - Transports 13 VDDK App
Page 15 and 16: VDDK - HotAdd transport (new in 1.1
Page 17 and 18: VDDK - SAN transport 17 ESX server
Page 19 and 20: VixMntapi (new in 1.1) 19 VixMntapi
Page 21 and 22: VixMntapi Internals - Windows 21 Vi
Page 23 and 24: VixMntapi internals - Windows 23 Af
Page 25 and 26: References and Links 25 VDDK main l
Page 27: VMware Virtual Disk Development Kit

VMware Virtual Disk Development Kit - VMware Communities

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