Problem with disklabel and filesystem over iSCSI

[Erik Scholtz, ArgonSoft GmbH]

Danny Braniss wrote:
>> ok, i started the system in single-user-mode and brought up the iSCSI 
>> connection. I tried to install the ufs first, after each step I synced. 
>>   No change - problem remains the same (newfs is failing).
>>
>> Then I installed the ZFS again, also synced after each step, then 
>> unmounted the iSCSI device, synced again (always at least three times). 
>> Then rebooted the system (going to single-user-mode again) and the ZFS 
>> is corrupted again with the same message.
>>
> in the case of zfs, you have to
> 	 /etc/rc.d/zfs stop
>

I used the "zfs umount tank" command. I now tried it with "/etc/rc.d/zfs 
stop" (both cases: before and after umounting the volume via "zfs 
umount") and synced again. Still the effect remains the same: After 
reboot the filesystem is corrupted and unreadable.

>> I don't think the buffers are the problem.
>>
> are you sure that the iscsi target is only used by the freebsd host?

100% for sure. The SAN is (at the moment) connected via Cross-Cable 
directly to the FreeBSD-Box, so has only a dedicated connection. Before 
that it was connected over a seperate Cisco 520G Switch, only used by 
the SAN and the FreeBSD Box.
The networkcard is a INTEL 1GBit. Also tried it with a nVidia nForce Pro 
3400 (also 1GBit). I also played with the MTU sizes: at the moment it is 
default (1500) - but other sizes (jumbo size 9000) also do not change 
anything (I made sure, both sides (SAN and FreeBSD) uses the same size).

Erik

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