Problem with disklabel and filesystem over iSCSI

[Danny Braniss]

> 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).

Since you seem to be in a cooperative mood :-), can you try checking
with a smaller volume? say 200GB? either UFS or ZFS?
the biggest I have access to is 921595 Meg and it does not show your problems.
also, what is the Media Sector size?
fdisk da0 should show it.

cheers,
	danny