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2–Boot from SAN
New Parameter: ql4disablesysfsboot
2-2 IS0054604-00 A
New Parameter: ql4disablesysfsboot
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.
Boot from SAN Configuration Matrix
Table 2-1 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).
NOTE
All boot from SAN cases assume that iSCSI BIOS is enabled.