Server Fault is a question and answer site for system and network administrators. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

My client has QNAP library that I've used to share 2 iSCSI connections. One to physical machine and the other to virtual machine on top of that machine. One is 4TB (connected to physical machine) and the other one is 1.4TB. Both use Windows 2008 R2 Enterprise

It's 2nd time that iSCSI drive disappeared from virtual machine (and physical host still is connected to the other iSCSI device) and when I used iSCSI initiator to reconnect the drives, they were reconnected but the 1.4TB is treated as RAW and I can't access data. The first time we assumed it was accident but now it's clearly something wrong.

What can be happening and why? How can I fix it?

share|improve this question
Open a command window on the VM and do a ping -t to the qnap, then when you lose the iscsi connection see if you also lost pings. I'm no fan of iscsi personally but the one thing we know is that is uses the same 'works' as everything else, so if you're losing a connection we can diagnose it the same ways. – Chopper3 Sep 22 '11 at 10:32
It happens once per month or so .. It's not very common I don't even remember date it happend last time just that it happend. Right now I'm trying to recover some data but I'm preety sure all is there just partition table is gone or so. – MadBoy Sep 22 '11 at 11:04
What's your iSCSI server? We've got a Windows iSCSI server and the monthly automatic reboots that Microsoft was forcing was breaking our iSCSI (connections get dropped and won't come back up automatically, have to shutdown client servers and manually restart services). – Brian Knoblauch Oct 20 '14 at 17:32

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Browse other questions tagged or ask your own question.