Modifying The Raidtab Configuration File - HP StorageWorks 500 - G2 Modular Smart Array User Manual

Copy the new kernel boot image to the /boot directory (use the Tab key to autocomplete
a.
directory names or display possible options). Name the boot image vmlinuz-xxxx where xxxx is
the kernel version number with the name you used in the very first step (ex., vmlinuz-2.4.9-
Emultipath).
cp /usr/src/linux-xxx/arch/ixxx/boot/bzImage /boot/vmlinuz-xxxxx
Make the boot image bootable:
b.
mkinitrd vmlinuz-xxxx xxxxx
Update the GRUB or LILO configuration file to include the new kernel, by doing one of the
c.
following:
To update GRUB, edit /boot/grub/menu.lst in a text editor, copy one of the entries and change
the values to match those of the new kernel boot image and the title GRUB will use to display.
For LILO, edit the /etc/lilo.conf by copying one of the entries and changing the values to match
those of the new kernel boot image and the title LILO will use to display. To apply the new
configuration, run the following command:
/sbin/lilo
The new kernel is ready for use.
Reboot and select the new kernel at the GRUB or LILO prompt. If the new kernel does not work
11.
properly, select the original kernel to boot from and remake the kernel or reconfigure the operating
system.
Installing the module without modifying the kernel
Load the module. Enter:
1.
insmod multipath
Verify that the module is installed and loaded by listing all modules. Enter:
2.
lsmod
The kernel is now ready for multipath operations, but to support multipath, you must enter these
commands each time the server is restarted.

Modifying the RAIDTAB configuration file

To perform multipath operations with a Linux operating system, a raidtab configuration file must be
present. Use the instructions in the following sections to be sure the raidtab configuration file contains the
appropriate information.
RAIDTAB terms
Observe the following definitions for raidtab terms:
raiddev—introduces the configuration for a particular device
nr-raid-disks—the number of raid disks in the array; specified in the /dev/cciss directory
persistent-superblock—must be set to 1 if an md device is to be mounted/used during a reboot
chunk-size—sets the stripe size in bytes, in the power of 2
device—the physical device that makes up the RAID array
raid-disk—the index of the device in the RAID array
For more information, refer to the operating system documentation.
Installation and operation in Red Hat Enterprise Linux 2.1 environments 16