1) QCOW2 convert to VMDK
qemu-img convert [-c] [-p] [-f fmt] [-t cache] [-O output_fmt] [-o options] [-S sparse_size] filename output_filename
qemu-img convert -f qcow2 -O vmdk -o adapter_type=lsilogic,subformat=streamOptimized,compat6 vm-1301-disk-1.qcow2 vm-1301-disk-1.vmdk
-f First image format
-O output_fmt
-o options
qemu-img convert -O vmdk -o ? source dest.vmdk
root@~# qemu-img convert -O vmdk -o ?
Supported options:
size Virtual disk size
adapter_type Virtual adapter type, can be one of ide (default), lsilogic, buslogic or legacyESX
backing_file File name of a base image
compat6 VMDK version 6 image
hwversion VMDK hardware version
subformat VMDK flat extent format, can be one of {monolithicSparse (default) | monolithicFlat | twoGbMaxExtentSparse | twoGbMaxExtentFlat | streamOptimized}
zeroed_grain Enable efficient zero writes using the zeroed-grain GTE feature
2) vmkfstools -i /vmfs/volumes/11/vm-1301.vmdk /vmfs/volumes/11/vm-1301.vmdk
Comparison of setups:
1) Fujitsu Server + 8Gbps FC + Storage 24 HDD @10k
2) HP Server + 2Gbps FC + Storage RAID10 6 HDD @10k
3) HP Server + 6Gbps local SCSI + RAID10 6 HDD @10k
4) Simple PC + SSD
PC and HDD/SSD:
| READ | WRITE | |||||||||||
| DISK | seq128KB-Q32-1T | rand-4KB-Q32 1Thread | iops | seq-1MB-1Q 1 Thread | 4KB-1Q 1Thread | iops | seq128KB Q32-1T | rand-4KB-Q32 1Thread | iops | seq-1MB-1Q 1 Thread | 4KB-1Q 1 Thread | iops |
| Hitachi HDS721050CLA362 500GB 7200 | 53 | 0.5 | 119 | 75 | 0.3 | 74 | 75 | 0.6 | 143 | 68 | 0.5 | 130 |
| OCZ agility 3, 480GB, SATA3 | 186 | 17 | 4134 | 184 | 15 | 3600 | 112 | 19 | 4670 | 147 | 19 | 4555 |
| Intel 520, 500GB, SATA3 | 226 | 23 | 5680 | 223 | 16 | 3900 | 164 | 29 | 7100 | 147 | 29 | 7040 |
Servers and Storage:
 |
| Result Comparison for 4 setups |
Servers and Storage:
Setup nr. 1
HOST Specs:Fujitsu Blade
CPU: 12x 2.4 GHz Xeon E5-2620 v3
RAM: 96 GB
Storage: 3PAR FC 24x HDD 10k SAS (via FiberChannel 8Gbps)
Single HOST assigned to this LUN
Soft Used:
Proxmox VE v 4.2-56 (running kernel: 4.4.13-1-pve) + LVM
ESXi 5.1 v 2323236 + VMFS8
CrystalDiskMark v 5.1.2 x64
VM Specs:
for pve: Win7 Ultimate 64b (clean install) + virtio drivers (IO + network)
for vmware: Win7 Ultimate 64b (clean install) + pvSCSI drivers (in case of pvSCSI controller)
CPU: 2x4 vCPUs
RAM: 16 GB
HDD: 50 GB
Single running VM on this HOST
Tests Done:
PVE raw: no-cache/writeback/writethrough/direct-sync
PVE qcow2: no-cache/writeback/writethrough/direct-sync
PVE vmdk: no-cache/writeback/writethrough/direct-sync
ESXi LSI-SAS (Windows 7 - do not req additional drivers for HDD)
ESXi pvSCSI (Paravirtual SCSI controllers, which req drivers for Windows 7)
Info:
VmWare:
- http://www.vmware.com/files/pdf/1M-iops-perf-vsphere5.pdf
- Configuring disks to use VMware Paravirtual SCSI (PVSCSI) adapters
PVE KVM:
- http://events.linuxfoundation.org/sites/events/files/slides/CloudOpen2013_Khoa_Huynh_v3.pdf
Results:
 |
| proxmox kvm raw |
 |
| proxmox kvm qcow2 |
 | |
|
 |
| vmware esxi 5.1 |
Another setup:
HOST Specs:HP Server
CPU: 24 @ 2.6 GHz (4 CPU * 6 Sockets) AMD Opteron
RAM: 256 GB
- Storage1: IBM Storage 6 x HDD 10k SAS (via FiberChannel 2Gbps)
Single HOST assigned to this LUN
Soft Used:
Proxmox VE v 4.2-56 (running kernel: 4.4.13-1-pve) + LVM
ESXi 5.1 v 2323236 + VMFS8
CrystalDiskMark v 5.1.2 x64
VM Specs:
for pve: Win7 Ultimate 64b (clean install) + virtio drivers (IO + network)
CPU: 2x4 vCPUs
RAM: 16 GB
HDD: 50 GB
Single running VM on this HOST
VMWARE nested
ESXI->VM(win2012)
cpu..183-Billions (Burn-in-test v6.0)
READ :187/16.8 (4116)/196/11.6 (2822) intel-ssd
WRITE:141/18.4 (4480)/153/14.4 (3226) intel-ssd
ESXI->VM(ESXI)->VM(xp-nested)
cpu..110-Billions
READ : 95/1.1 (270)/106/0.8 (208) hdd-raid10-6hdd-7200
READ :102/4.0 (966)/ 96/3.5 (858) intel-ssd
WRITE: 21/0.7 (183)/ 20/0.6 (136) hdd-raid10-6hdd-7200
WRITE: 81/2.9 (700)/ 85/2.4 (575) intel-ssd