Hello,
I have a ZFS storage based on our XStreamOS distro, running in production for 4 
months, never
had a problem.
The system shares various filesystems, some NFS, some iScsi, some CIFS.
The Windows PDC for CIFS resides inside a VMWare5 machine.
This PDC, has also a disk mounted via a VMWare-iScsi resource on the storage 
itself.
Today the disaster:
- CIFS stopped responding
- VMWare PDC could not be accessed not even via console, it just didn't let you 
enter the Administrator session.
- VMWare iScsi resource did not respond from the Storage management.
- The Storage machine did not let me get the bash prompt in any ssh session, 
not even on console (ssh auth was ok, but then I did not have any bash). I had 
no way to check the status of the storage, this way.
- All NFS shares were up and running happily, mounted by a SunFire w/Solaris10.
The only way I could solve:
- Shutdown NFS clients (SunFire).
- Kill the PDC VM via abrupt stop from vSphere.
- Send a poweroff signal to the Storage via the poweroff button (never halting 
anyway).
- Wait for all disks to be quiet, then force a poweroff by keeping the button 
pressed for a while.
After reboot, everything was normal again.
There is a kind of loop in this situation, but I suspect that all the problem 
started with the iScsi
not responding from the storage:
- the PDC did not let me in because it was angry with the missing disk from 
VMWare-iScsci. If this is the case, is it normal that a Windows server give me 
no way to enter when a disk is not responding?? Or should I just think that the 
PDC was freezing by itself (but in this case, I shouldn't see iscsi time out on 
vmware).
- the CIFS was not responding because the PDC was timing out
I don't understand why the storage was not giving me the bash, though!
And, I could not find any trace of errors, logs or whatsoever about iscsi 
problems.
Any idea where I should look to find traces of what happened?
Gabriele.



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