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[Xen-users] Problems with tap:aio on Dell PowerEdge 1950 III

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Subject: [Xen-users] Problems with tap:aio on Dell PowerEdge 1950 III
From: Aleix Dorca <adorca@xxxxxx>
Date: Thu, 3 Jul 2008 22:16:29 +0200
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Hi all,

this is my first post to this list. I've been trying to find information related to my problem on Google, the Xen irc channel and, of course, this lists.

The thing is that I've been dealing with Xen since version 3.0.3 on old machines (pentium IV without virtualization capabilities) running Linux DomU's without problems. I upgraded to 3.2.0 and 3.2.1 also without problems.

Lately we bought the machines that will run Xen in production. These are Dell PowerEdge 1950 III.

I have installed the same system that I had on the old machines, this is:

- Debian Etch 4.0r3
- Xen 3.2.0

I've tried with 32 and 64 bits, and also with the latest 3.2.1 xen version.

I can't get to work tap:aio. File:/ works perfectly though.

I get this error message on syslog on boot of the DomU:

Jul 3 13:51:52 xen64 kernel: blktap: ring-ref 8, event-channel 6, protocol 1 (x86_64-abi) Jul 3 13:51:52 xen64 kernel: blk_tap: Corresponding UE ring does not exist!"

And here, the domU, enters the wait state (300s countdown) and then nothing... disk is not mounted.

It doesn't matter if disk files are local or remote (via iscsi). It won't work.

Has anyone seen or deal with this problem? Do you need any other kind of information?

Thanks a lot,

Aleix Dorca.

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