VMware Vsphere raw device mapping

    Raw Device Mappings

    What is raw device mapping?

    Raw device mapping is a feature where the virtual machine can directly access the storage devices such as SAN or DAS.

    With a VMware we will use vmdk pointer to provide the proxy facility to raw device.

    In a virtual environment some cases we may need to have a raw device mappings.

    Why we need raw device mapping?

    • To configure Microsoft failover cluster, we can configure raw device as shared storage.
    • When we are configuring Microsoft failover cluster with one node is running on as a VM & other node/s running as a physical.
    • To run some of the san management software(ex hitachi horcm)
    • To run some backup software on virtual machine, and needs to get storage level backup

    How to Configure?

    1. Here I have one vm which is prepared to mount raw device

    clip_image001

    1. Using new datastore adding procedure, we can see new lun which is provided from our shared storage(in my case im using windows iscsi server)

    clip_image002

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Powercli how to download esx log files

√úsing this script we can download esx log files to local computer, which is running powercli.

save this script as ps1

 

#############################################################
# We can use this script to downlog log files from esx hosts#
# #
# #
# #
#############################################################
Write-Host “Please create a esxlogs folder in your C drive before you run this script. This will download vmkernel,hostd & vpxa log files to your computer”
Add-PSSnapin vmware.vimautomation.core
Add-PSSnapin vmware.deployautomation
$vcentername=Read-Host “Enter Vcenter Name”
$esxhostname=Read-Host “Enter ESX host Name”
Connect-viserver $vcentername
$esxvmkernel=(get-log -key vmkernel -vmhost $esxhostname).entries
$esxvmhostd=(get-log -key hostd -vmhost $esxhostname).entries
$esxvpxa=(get-log -key vpxa -vmhost $esxhostname).entries

Add-Content -path c:\esxlogs\$esxhostname””vmkernel.txt -value $esxvmkernel

Add-Content -path c:\esxlogs\$esxhostname””hostd.txt -value $esxvmhostd

Add-Content -path c:\esxlogs\$esxhostname””vpxa.txt -value $esxvpxa