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how hosts connects to data store , any examples of VM's troubleshooting steps.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
ESXi Hosts connect to datastores via 3 shared storage technologies or using Local Storage, e.g. directly attached to the host.

3 shared storage technologies are

1. Fibe Channel
2. iSCSI
3. NFS

for iSCSI and NFS - check the network.

for Fibre Channel - check fibre channel storage network.

for Local Storage check local disks have not failed, e.g. RAID or storage control failure.

Otherwise you will have to investigate and check the logs in /var/log on each host, and check if the LUN (iSCSI and Fibre Channel LUN) are present.

Here are some EE Articles

HOW TO: Enable Jumbo Frames on a VMware vSphere Hypervisor (ESXi 5.0) host server using the VMware vSphere Client

HOW TO: Add Local Storage (e.g. a SATA disk) as a Raw Disk Mapping (RDM) or Mapped RAW LUN to a virtual machine hosted on ESXi

HOW TO: Add an iSCSI Software Adaptor and Create an iSCSI Multipath Network in VMware vSphere Hypervisor ESXi 4.1

HOW TO: Add an iSCSI Software Adaptor and Create an iSCSI Multipath Network in VMware vSphere Hypervisor ESXi 5.0

Also here are some videos I've produced for EE Members, on iSCSI and NFS storage

[url="http://andysworld.org.uk/2011/06/24/new-hd-video-adding-iscsi-storage-to-a-vmware-vsphere-esxesxi-4x-host-server/"]Video Tutorial -

Video Tutorial - Eazy Peezy Lemon Squeezy iSCSI Storage by StarWind iSCSI SAN Software

Video Tutorial - Creating an NFS Datastore using Windows 2008 R2 for VMware vSphere ESX/ESX 4.x

Video Tutorial - Adding an NFS Datastore to a VMware vSphere ESX/ESXi 4.x host server

All of the above are valid for all versions of ESXi.
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