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Old 09-03-2003, 09:59 PM   #1
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Registered: Jul 2003
Location: PR China
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How to configure Linux to support multiple LUNs?

Hi, everybody!

I've had 2 RAID installed in an disk array. These 2 Logical drives are separately mapped to 2 LUNs of the same host channel. The SCSI Adapter's configuration is right because I can get these 2 logical drives on Windows 2K (I have both Win 2K and Linux installed). However, RH Linux Advanced Server (2.4.9-e.3) seems not to check LUN1 when booting. So I only have /dev/sda, which is the logical drive mapped to LUN0.

Anyway, I used "make xconfig" to confirm that my kernel "Probe all LUNs on each SCSI device", and append "max_scsi_luns=128" to each of the kernel image listed in the /etc/grub.conf file. The problem remains.

Anyone any ideas?? Thanks in advance.

Last edited by troyzeng; 09-03-2003 at 10:27 PM.
Old 09-04-2003, 12:58 AM   #2
Registered: May 2003
Distribution: Slack Puppy Debian DSL--at the moment.
Posts: 341

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OOPS! Raid in linux doesn't use /dev/sda. /dev/sda is an individual hard drive, not the partitions therein. When you did the install and were partitioning the hard drives, didn't you see the option to make raid devices? (Unless the nomenclature has radically changed since I set up my network.)

Go to; search term: /dev/md0

You may have my problem, I have a tendency to read too fast and not in depth. Then I beat myself up for not remembering everything. Take the time to read the "Raid Howto" and then look up other people's explanation of the same subject.

When you have the "Aha!", write your own explanation of it and post it to the web (After you get everything just the way you want it.). Your explanation will be the one that gives someone else the "Aha! Now I get it!" moment. Besides, if you lose your notes--you can always look yourself up on the Web.


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