Davoud Teimouri

Virtualization & Datacenter

Category: ESXi

Guest Connected vs RAW Device Mapping (RDM)

iSCSI vs Fiber Channel

RAW Device Mapping (RDM) is one of oldest VMware vSphere features which introduced to resolving some limitation on virtualized environments such as virtual disks size limitation and deploying services top of fail-over clustering services.

You can use a raw device mapping (RDM) to store virtual machine data directly on a SAN LUN, instead of storing it in a virtual disk file. You can add an RDM disk to an existing virtual machine, or you can add the disk when you customize the virtual machine hardware during the virtual machine creation process.

1,861 total views, 3 views today

[News]: VMware Tools 10.3.0 is Discontinued

Why VMware Tools 10.3.0 is Discontinued? VMware has release VMware Tools 10.3.0 on 12th July, It includes some new functionality such as VMware AppDefense Integration. But today, VMware asked the customers to downgrade VMware Tools on some guest OSes. Seems, there is some issues in some vSphere ESXi 6.5 configurations with the VMXNET3 network driver for Windows that […]

12,525 total views, 3 views today

VMDK Write Performance on Different Provisioning Types

Provisioning Types Comparison

VMDK (Virtual Machine Disk) has been designed to mimic the operation of physical disk. Virtual disks are stored as one or more VMDK files on the host computer or remote storage device, and appear to the guest operating system as standard disk drives.

VMware supports three provisioning types:

Thin Provisioned
Thick Provisioned
Eager-zeroed Thick Provisioned

3,725 total views, 2 views today

Hardware Status Problem on HPE ProLiant Gen10

The Hardware Sensor Status Reported in the vSphere Web Client Do you have any HPE ProLiant Gen10 on your virtual environment? Did you upgrade their iLO firmware to 1.30? If you have the servers with upgraded iLO firmware, you may face with the below status on Hardware status tab in vSphere Web Client: VMware vSphere […]

9,726 total views, 12 views today

[Review]: vSphere 6.5 Update 2

vCenter 6.5 Update 2

Today, VMware has announced vSphere 6.5 U2 with lot of new features and fixes on components specially on ESXi and vCenter. vSphere 6.5 U2 has some new features that backported from vSphere 6.7 . VMware recommended upgrading vSphere 5.5 to vSphere 6, 6.5, so vSphere 6.5 U2 is good choice for upgrade virtual infrastructure with less impact, because many hardware that supporting vSphere 5.5, don’t compatible with vSphere 6.7 . Upgrading to vSphere 6.5 Update 2 from vSphere 5.5 requires a minimum version of vSphere 5.5 Update 3b prior to performing the upgrade.

5,344 total views, 2 views today

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