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l4n3 03-24-2008 10:55 AM

RHEL 5 adding a LUN without a reboot
Trying to find a more convenient way to add a LUN than that referenced here:

Any ideas? That kbase article is old, so I'm hoping there's something better in RedHat 5.

l4n3 03-25-2008 10:26 AM

qlogic tool
Okay, there's a tool:

That's supposed to dynamically discover new LUNs if you have qlogic cards, which I do.

However, I can't test it right now since the SAN manager is out of town.

Anybody have experience working with this tool? Good, bad, indifferent?


jonesr 03-25-2008 03:00 PM

There's this SCSI rescan trick:
echo "- - -" > /sys/class/scsi_host/host0/scan

I use that to pick up SAN LUNs that have been added to RHEL4/5 VMware guests.


l4n3 03-26-2008 12:01 PM

Thanks jonesr. That's similar to the kbase article I referenced above, but different.

and FYI, the qlogic tool doesn't work with RHEL5 since it relies on /proc which doesn't appear to be useful anymore.

XaViaR 03-26-2008 10:38 PM


Speaking of RHEL4/5 VMware guests, do you or anyone else know of a way to add a vmdk (an extra disk) to a RHEL4/5 VMWare guest OS witout rebooting?


slacksite 03-27-2008 02:54 PM


I'm not sure that I follow what is not convenient about RH's KB article for adding a device?

l4n3 03-28-2008 03:17 PM

Well, I don't want to have to know all the numbers to fill into the echo and I don't want to have to remember the path to echo it to.

I like a nice simple command like `add lun` which would scan the cards and pick it up.

Rumor has it that `kudzu` will work. Will try asap...

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