Can boot guest from ISO but not install OS from ISO

[Xian78]

I have many ISO files for geust OS installation that have been tested and used many times over.

I have a new vSphere 5.1 installation with no local DVDROM so I have uploaded some ISO's to the local datastore.

The guest VMs can boot to those ISO files but OS installation fails, with different errors from each different OS.

Windows 7 installation fails because the drivers for the CDROM aren't available.

I have reverified the files as well as reuploaded them to the datastore a couple times with the same results.

I have mounted the Windows 7 ISO file on my local machine and then used connect to client device to that mounted ISO and installation from it works, so after dismounting the ISO locally I uploaded once more and tried installing another VM from it with the same results.

Any thoughts or suggestions would be great.

[Dave_Mishchenko · Accepted solution]

You may wish to check the integrity of the download:

kb.vmware.com/kb/1032711
http://communities.vmware.com/message/2129445

[Xian78]

Thanks, I'll give it a shot but it doesn't explain what I am seeing.

It seems that every ISO I upload is bad, so 10 for 10 right now.

My CentOS ISO passes verification afer boot but then install fails, research error says faulty installation media, but it passes verification???

I can conenct from the same machine and upoad the same ISOs to this and another host and they work fine on the othre host but not on this one.

[a_nut_in]

What hardware are you using for the host and what is the storage?

[Xian78]

Sorry it took so long to reply.

It did indeed turn out to be an issue with the ISO files.

I could take those ISO files in to a VM on that host and burn and usable ISO from them to disk which works everywhere else I tested them but on this host I could not install a guest OS with any of them.

I re-downloaded the ISOs to a VM on the host then uploaded to the datastore and the new downloads work on this host.

I think it is very odd but I was able to get around it thanks to help from the community.

I awarded answers and helpfuls, thanks everybody.