guys,
I just got passed on to support a new Redhat 4 server. It has two Qlogic HBA cards attached to a FC switch and a fabric that has a LUN presented to the Linux Server. According to the department, which has no Linux admins, the driver for Qlogic is already installed.

Here are my questions:

How do I discover the LUN?
How do I mount the LUN?
How do I add the LUN to fstab?

Is there a command to discover the LUN, to add the LUN, etc..

HELP.

Well first, make sure you actually have support for the QLogic card. It might be running as a module, usually starting with qlaXXXX, depending on the model you have installed.

Not sure or don't see anything related, could have been built into the kernel. You could get the model maybe from:

You can find out the LUN info by cat'ing the /proc/scsi/<qlogic-device>/<scsi-number>

Then hot adding a LUN should look something like this from the info you get from the previous cat output:

"echo "scsi add-single-device Controller Channel Target LUN" > /proc/scsi/scsi"

I just downloaded the qlogic drivers and it seems to rebuild initrd and backup the file and modules.conf was also done for me..so, I guess it usually depends on the hardware being used. But, thanks for the reponse, I also found a .sh file does the scanning for new LUNs...great stuff.

Yeah, it's been awhile since a previous employer had actual SAN over fiber for me to toy with, the QLogic drivers do come with some handy scripts to install/discover, etc.