Known issues and limitations for IBM z Systems hosts

Interoperability restrictions with Red Hat Enterprise Linux 4 update 4 for IBMz Systems
There are interoperation restrictions for the system software and Red Hat Enterprise Linux 4 Update 4 for IBMz Systems.

Changing the timeout value for the FC transport class
You can change the timeout value for the Fibre Channel (FC) transport class when the I/O operation stalls.

SCSI device state changes from running to offline
In some instances, the Small Computer System Interface (SCSI) mid layer changes the SCSI device state from running to offline.