1. I search the net and the vmware Compatibility Guide to see if my Tandberg 220LTO tape is supported but I couldn't find any reference to tape driveWill this tape work on my server ?
I haven't seen too many people posting with questions on that model drive. I don't have one either so I don't know for certain. If it's not listed, then it's probably not officially supported, but I don't recall how many tape drive were listed in the first place, if any.
2. The new server has a hp dat72 tape drive that is connected to ultra 320 scsi pci cardit is recognized and working well on the new vm guest could I use the same scsi cable to connect the second Tandberg 220LTO tape (the hp dat72 will only be use as backup tape)
Since you have a working SCSI tape drive in the virtual machine, you can easily attach your Tandberg to test it. The biggest hurdle was here, getting a compatible SCSI controller, which you appear to have since the DAT drive works.
3. when I will connect the Tandberg 220LTO tape and boot the exsi server
Will the esxi4.0 recognize my tape automatically or I need to install it on the esxi server ?
As with the previous answer, since you appear to have a compatible SCSI controller, then you likely will be able to use the Tandberg. If the Tandberg has a autoloader, then that may or may not work. But you won't be installing drivers into ESX. You're going to be preseting the Tandberg to the virtual machine just like you did with the DAT drive (e.g.: virtual machine settings menu.) So the drivers will go into the guest OS and not ESX.
