Sudden crash, possibly Volume Replication error?

[Photubias]

Hi,

This weekend we experienced an open-e production crash. We couldn't log on to the web interface and als all NFS volumes were unavailable to our VMs.
After performing a hard reboot, all came back online and works ok.

We have several iSCSI targets on this Open-e too and are Volume Replicating those to another Open-E on the network. Around the crash we got these errors on the crashed DSS-machine:

Volume Replication:
Device lv0001: Connection (from SyncTarget to WFConnection).
Mode local/remote (from Secondary/Primary to Secondary/Unknown).
DataStatus local/remote (from Inconsistent/Consistent to Consistent/DUnknown).

I suppose these are either what caused the crash or what happened after the crash?

How can we find out what was the exact cause?

Thanks in advance

[To-M]

Check the dmesg.2 logs and the critical error logs as well, if possible post them here so we can see what might be happening.