HP Booting Linux X86 And X86 64 Systems Manual

							 
Figure 32 
 
5.  Ensure that iscsi-initiator-utils and device -mapper-multipath packages are selected in the 
package list. 
 
Figure 33 
  
						

							 
Figure 34 
 
6.  Complete the installation and reboot the server. 
 
Note:  
•   If the installation partitions are on a XP a rray, comment the following line in defaults 
section in the /etc/multipath.conf file: 
  prio_callout            /bin/true 
•   If the installation partitions are on a MSA2 xxxsa array, comment the following line in 
device section of the MSA2xxxsa arra y in the /etc/multipath.conf file: 
  getuid_callout          /sbin/hp_scsi_id -g -u -n -s /block/%n 
 
Recommended configuration on  SLES operating system 
  •  It is recommended to have a single path to  the logical units while installing SLES10 
operating systems and multiple paths to the lo gical units while installing SLES11 systems. 
•   It is also recommended to mount the installa tion partitions using “by-label” fstab option. 
•   If you are choosing to mount the installation partitions by device-id, ensure that you set the 
user_friendly_names to no  in /etc/multipath.conf file to avoid boot failures after 
rebuilding the  initrd image. 
 
Note:  For iSCSI SAN devices in SL ES10SP2, use only “by-id” fstab option to mount the 
installation partitions. 
 
1.  Start the installation of the operating system . For iSCSI SAN boot, complete the following 
step, else go to  Step 3
: 
a.   Provide the parameters “withiscsi=1 netsetup=1” to the kernel boot line for 
SLES10SP2.   
						

							 
Figure 35 
 
b.   Provide the parameters “withiscsi=1” to  the kernel boot line for SLES11. 
 
 
Figure 36 
 
 
2.  To add the iSCSI devices for installation, co mplete the following step, else go to Step 3
: 
  a.  Select the currently used network device (NIC)  
						

							 
Figure 37 
 
b.  Configure the IP information. 
 
Figure 38 
 
c.   Ensure that the “Initiat or Name” is correct. 
 
Figure 39 
 
d.   Setting up the target IP: 
 
•  For SLES10 operating systems ensure that only one target IP is connected and the 
Start-Up is set to automatic.  
						

							 
Figure 40 
 
•  For SLES11 operating systems ensure that more than one target IP set. By default only 
one target IP is connected. Add new ta rget IPs using the “Add” button under the 
Connected Targets tab.  
 
Figure 41 
 
•  Enter the Target IP address and click Next.  
						

							 
Figure 42 
 
•  Click Connect  to connect to the target IP. 
 
Figure 43 
 
•  Change the Start-Up to automatic  by using the toggle set-up button. 
 
3.  Select the device for installing the operating system: 
•  For SLES11 operating systems, complete the following steps: 
a.   Select the DM devices to crea te installation partitions. 
b.   By default, DM devices are not listed. To list the DM devices select Hard Disks.  
						

							c.  Click  Configure > Configure Multipath > Yes > Yes. 
d.   Select the DM devices to crea te installation partitions. 
 
Figure 44 
 
•  For SLES10 operating systems, select SAN devices for installation partitions. 
4.  While creating the installation partitions, select either of the following options: 
•  If you intend to use the “user_friendly_names” with device mapper multipath devices 
select “by-label” fstab option. 
•   If you do not intend to use the “user_fr iendly_names” with device mapper multipath 
devices, select “by device-id” fstab option. 
 
Figure 45 
 
5.  Complete the installation and reboot. 
6.  Ensure that the latest supported Device m apper multipath tools package is installed. 
7.  If you have chosen to mount the installation par titions by device-id, ensure that you set the 
user_friendly_names to no  in /etc/multipath.conf file. 
8.  For boot volumes mounted using “by-id” fstab options, configured on Smart Array Controllers, 
perform the following steps, else go to  Step 9
.  
						

							28 
•  Modify root=/dev/disk/by-id/cciss-3xxxxxxxxxxxxxxxxxxxxxx to root=/dev/disk/by-
id/scsi-3xxxxxxxxxxxxxxxxxxxxxx in  /boot/grub/menu.lst. 
•   Modify /dev/disk/by-id/cciss-3 xxxxxxxxxxxxxxxxxxxxxx to /dev/disk/by-id/scsi-
3xxxxxxxxxxxxxxxxxxxxxx in /etc/fstab. 
9.  Enable multipath services to start at boot time by running the following commands: 
~foo# chkconfig boot.multipath on 
~foo# chkconfig multipathd on  
10.  Add device mapper multipath kernel module to  initrd image by completing the following 
steps: 
a.   Edit the file /etc/sysconfig/kernel and  add dm-multipath to INITRD_MODULES 
b.   Create  a new initrd image, which  include device mapper kernel modules 
~foo#mkinitrd -k  —i  
c.   Edit the value for default parameter in /boot/grub/menu.lst file to boot with the new 
initrd image. 
11.  Reboot the server. 
 
 
 
  
						

							Additional Information 
For detailed information about HBAs, switches, storage arrays, and storage software, go to the 
following websites: 
 
Table 1 
Topic HP  website 
HBAs and switches http://h18006.www1.hp.com/storage/saninfrastructure.html
Storage array 
systems  http://h18006.www1.hp.com/storage/arraysystems.html  
Device Mapper 
Multipath software http://www.hp.com/go/devicemapper
Integrity servers 
http://www.hp.com/products1/servers/integrity/  
 
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to  [email protected]
. 
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