Chandra Seetharaman wrote: > I am working on a multipath usage document. Attached is the installation > section of that document. > > Note that it is written for RHEL5 U1 and SLES10 SP1. > > Good Luck, > > chandra > > On Wed, 2007-12-19 at 13:02 -0800, Pradipmaya Maharana wrote: >> Hi All, >> >> Is there a process/document that talks about how to configure >> root/boot device for multipath? >> >> Thanks and Regards, >> Pradipmaya. >> >> -- >> dm-devel mailing list >> dm-devel@xxxxxxxxxx >> https://www.redhat.com/mailman/listinfo/dm-devel >> >> ------------------------------------------------------------------------ >> >> 4.1. Installation instructions for SLES10 >> >> Note: This is tested on SLES10 SP1. If you have any other version, your >> mileage may vary. >> >> 1. Install the OS in a device that has multiple paths. Make sure the >> root device's "Mount by" option is set to "Device by-id" (this option is >> available under "expert partitioner" as "fstab options"). >> 2. Complete the installation. Let the system boot up in multiuser mode. >> Make sure the root device, swap device are all referenced by their by-id >> device node entries instead of /dev/sd* type names. If they are not, fix >> them first. >> 3. Once booted, update /etc/multipath.conf If you have to make changes >> to /etc/multipath.conf, make the changes. >> Note: the option "user_friendly_names" is not supported by initrd. >> So, if you have user_friendly_names in your /etc/multipath.conf file, >> comment it for now, you can uncomment it later. >> 4. Enable multipathing by running the following commands >> * chkconfig boot.multipath on >> >> * chkconfig multipathd on >> 5. Add multipath module to initrd >> >> Edit the file /etc/sysconfig/kernel and add "dm-multipath" to >> INITRD_MODULES". Note: If your storage devices needs a hardware handler, >> add the corresponding module to INITRD_MODULES, in addition to >> "dm-multipath". For example add "dm-rdac" and "dm-multipath" to support >> IBM's DS4K storage devices >> 6. Run mkinitrd >> Note: You can uncomment the user friendly name if you have commented it above. >> 7. Reboot >> >> The system will come up with the root disk on a multipathed device. >> >> Note: You can switch off multipathing to the root device by adding >> multipath=off to the kernel command line. >> ACK. This is the correct way. Thanks for writing this up. Cheers, Hannes -- Dr. Hannes Reinecke zSeries & Storage hare@xxxxxxx +49 911 74053 688 SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg GF: Markus Rex, HRB 16746 (AG Nürnberg) -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
