I am running a couple of iSCSI target boxes. Occasionally, we see resets on the RAID controller that cause the storage system to turn into read only and all my LUN's drop. We have to restart the iscsi-target server, and then restart all the servers with attached LUN's. We have no notice that this will take place, and the RAID controller event log shows nothing at all.
The servers attaching to the LUN's are Windows 2003/2008, and CentOS 5.x servers.
Here is the error message we see in the /var/log/messages file when this happens.
kernel: hptiop_reset(4/0/0) scp=ffff8101eb41ab00
Intel Server, dual 5400 processors, 8GB RAM
6 Intel Ehternet (2 on board, 2 duals)
Highpoint RAID 4320