Справочник Пользователя для Q-Logic 8200 SERIES

2–Boot from SAN
New Parameter: ql4disablesysfsboot

2-2

IS0054604-00  A

The ql4disablesysfsboot parameter is a new driver module parameter for 

the Open-iSCSI based driver model (it is not supported by the ioctl based 

driver). This parameter controls the behavior of boot target login in the 
Open-iSCSI base driver, which provides two ways to log in to the boot targets.



Option 1: If ql4disablesysfsboot is 0, the Boot targets are exported 

through sysfs and iscsistart will issue a login to the boot target (that is, 

the login to the boot target will be triggered from the user space).



Option 2: If ql4disablesysfsboot is 1, the qla4xxx driver will handle 

the login to the boot targets.

Some environments require support for driver login (Option 2) to the boot targets 
for these reasons:



If the boot entry is a sendtarget entry, then iscsistart or 
open-iscsi cannot discover and log in to the discovered target. 



The system will not boot up if you only do the kernel upgrade and do not 
upgrade the iSCSI tools. 

 lists the different boot from SAN combinations for the 

ql4xdisablesysfsboot module parameter and its corresponding effect on the 

behavior of sysfs, iscsistart, and the qla4xxx driver when using the 
sendtarget entry (ST) and the iSCSI target entry (NT).

All boot from SAN cases assume that iSCSI BIOS is enabled.