[xcat-user] Re: Triton and Red Hat 7.1 HOWTO

Thu Jan 10 17:32:55 MST 2002

Useful information on how to get Fibre Channel to see all LUNS without
rebuilding kernel.

Jay Urbanski
Linux Cluster Architect
WW Technical Sales
(817)741-3500 TL 450-8796
(801)681-2410 fax
(817)821-6397 mobile
urbanski at us.ibm.com

----- Forwarded by Jay Urbanski/Dallas/IBM on 01/10/2002 06:29 PM -----

                    Gerald Paxson                                                                                        
                                         To:     Jay Urbanski/Dallas/IBM at IBMUS                                           
                    01/10/2002           cc:                                                                             
                    05:51 PM             From:   Gerald Paxson/Beaverton/IBM at IBMUS                                       
                                         Subject:     Re: Triton and Red Hat 7.1 HOWTO                                   

----- Forwarded by Gerald Paxson/Beaverton/IBM on 01/10/2002 03:50 PM -----

                    Puneet                                                                                              
                    Chaudhary            To:     Sumant Vashisth/Beaverton/IBM at IBMUS                                    
                                         cc:     Dennis Nadbornik/Beaverton/IBM at IBMUS, Judith K                         
                    11/01/2001           Ingles/Poughkeepsie/IBM at IBMUS, Abesolom Fidel/Beaverton/IBM at IBMUS, Benjamin    
                    01:22 PM             Rutledge/Atlanta/IBM at IBMUS, Jim Schisler/Beaverton/IBM at IBMUS, Gerald           
                                         Paxson/Beaverton/IBM at IBMUS, Luong D Nguyen/Beaverton/IBM at IBMUS, Charles        
                                         Banaka/Beaverton/IBM at IBMUS, Kevin Gildea/Poughkeepsie/IBM at IBMUS                
                                         From:   Puneet Chaudhary/Poughkeepsie/IBM at IBMUS                                
                                         Subject:     Re: Triton and Red Hat 7.1 HOWTO(Document      
                                         link: Gerald Paxson)                                                           

Well, It works without rebuilding the kernel.. Below is what I did.

1. First I added the line "options scsi_mod max_scsi_luns=128" to
modules.conf. This enables MULTI_LUN support in the kernel without
rebuilding the kernel.
2. Next I re-built the two initrd images
     mkinitrd initrd-2.4.2-2.img 2.4.2-2
                mkinitrd initrd-2.4.2-2smp.img 2.4.2-2smp
3. Re-ran /sbin/lilo so that at boot time, the new initrd images would
used.
4. Rebooted the node. During the boot process, the node panicked.
This happened because we are running a modular kerenel and the adapatec
SCSI device driver needs to be probed before any other SCSI adapters so
that during the init phase, the kernel can properly find the root device.
The internal drive needs to be available before other drives come online.
5. So I rearranged the modules.conf file as shown below:

-- ORIGINAL modules.conf
alias eth0 eepro100
alias scsi_hostadapter qla2x00
alias scsi_hostadapter1 aic7xxx
alias scsi_hostadapter2 ips
alias eth1 e1000
alias parport_lowlevel parport_pc
alias scsi_hostadapter3 aic7xxx
alias scsi_hostadapter4 aic7xxx
alias usb-controller usb-ohci

-- NEW modules.conf
alias eth0 eepro100
alias scsi_hostadapter aic7xxx
alias scsi_hostadapter1 ips
alias eth1 e1000
alias parport_lowlevel parport_pc
alias scsi_hostadapter2 qla2x00
alias usb-controller usb-ohci
options scsi_mod max_scsi_luns=128

6. I then remade the initrd images, ran /sbin/lilo and rebooted the node.
This time everything worked. The node did not panic and all the SCSI LUNS
are available on the system.
I am now going the update the other three storage nodes.
Hope you'll find this helpful.

Later,

Regards,
Puneet Chaudhary
Poughkeepsie Unix Development Lab
Server Group, IBM Corp.
Poughkeepsie, NY 12601
Phone: (845) 433-8655    T/L: 293-8655
FAX: (845) 433-8363    T/L:293-8363
Email: puneetc at us.ibm.com

Sumant Vashisth
11/01/2001 12:22 PM

To:   Dennis Nadbornik/Beaverton/IBM at IBMUS, Judith K
      Ingles/Poughkeepsie/IBM, Abesolom Fidel/Beaverton/IBM at IBMUS
cc:   Benjamin Rutledge/Atlanta/IBM at IBMUS, Puneet
      Chaudhary/Poughkeepsie/IBM at IBMUS, Jim Schisler/Beaverton/IBM, Gerald
      Paxson/Beaverton/IBM at IBMUS, Luong D Nguyen/Beaverton/IBM, Charles
      Banaka/Beaverton/IBM at IBMUS
From: Sumant Vashisth/Beaverton/IBM at IBMUS
Subject:  Triton and Red Hat 7.1 HOWTO

Abby has been successful in having the x342 storage nodes running Redhat
7.1 (2.4.2-2 Kernel) see all the disks in FastT200 storage devices and has
posted the procedure on the following website.

http://w-falcon.des.beaverton.ibm.com/~afidel/docs/Triton_tips.html

If you have any problems accessing the website please let me or Abby know.
His Notes email is down right now, but you can sametime him or reach him at
503.578.5492; T/L 775-4982.

Great work Abby !!!!!

Kind Regards,
--
Sumant Vashisth
Technical Project Lead
Beaverton Systems Test
Phone: (503) 57-85492
T/L: 775-5492
sumant at us.ibm.com