Someone solved the issue like this with running opensuse10.3. you can try
download source code from http://www.open-iscsi.org/bits/
complie for Ubuntu, it's like scsi_transport_iscsi 2.0-724 has
some uncompatible with Equallogic in iscsi nohup response??  The vision
2.0-865.13.tar.gz which I find the scsi_transport_iscsi version is 2.0-865.

2008/12/8 Evan Broder <[EMAIL PROTECTED]>

> A group I work with is currently using a Dell Equallogic RAID with
> four servers on a dedicated storage network. We've been regularly
> experiencing connection errors:
> Dec  8 00:50:36 aperture-science kernel: [1010621.595904]
> connection1:0: iscsi: detected conn error (1011)
> Dec  8 00:50:37 aperture-science iscsid: Kernel reported iSCSI
> connection 1:0 error (1011) state (3)
> Dec  8 00:50:39 aperture-science iscsid: Login authentication failed
> with target iqn.2001-05.com.equallogic:
> 0-8a0906-2b6e7d402-891497db5ca48925-xvm-volume-1
> Dec  8 00:50:39 aperture-science kernel: [1010624.597349] iscsi: host
> reset succeeded
> Dec  8 00:50:40 aperture-science iscsid: connection1:0 is operational
> after recovery (1 attempts)
> These errors always occur about 40 seconds after a multiple of 5
> minutes after the hour. Other than that, we've seen no pattern in when
> they occur, or their cause. We've tried running some scripts designed
> to heavily utilize storage devices, but that doesn't seem to trigger
> it. These errors occur on all four of our servers, but not at the same
> time.
> The RAID is being used as a physical volume for an LVM volume
> group. The servers are being used for hosting Xen virtual machines,
> which use LVs on the RAID as their disk images. Shortly before the
> connection errors are logged, all disk I/O from the virtual machines
> hangs completely, causing the VMs to basically become non-responsive
> to non-trivial interaction.
> Our four servers are running the stock Ubuntu Hardy 2.6.24 kernel. I
> don't see an explicit version number in any of the iSCSI kernel
> source, but drivers/scsi/scsi_transport_iscsi.c contains:
> > > #define ISCSI_TRANSPORT_VERSION "2.0-724"
> The userspace utilities are 2.0.865.
> Does anyone know how to stop these errors? Is there more diagnostic
> information we could provide? We're way out of our league in terms of
> debugging this.
> - Evan
> >

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