OpenSUSE: installing on and booting from iSCSI

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iSCSI is probably not exactly the most exercised functionalitry in openSUSE (openSUSE 12.1 was even released with a buggy YaST iSCSI client module, which prevented installation on and/or configuration of iSCSI disks). Apart from that essentially quite minor hurdle, iSCSI works very well with openSUSE.

I've recently completed an exercise in installing openSUSE 12.1 on IBM HS20 blades without local disks, only iSCSI access, and it was suggested to me I do a short write-up.

Environment

Having a working iSCSI server is obviously essential - I have a server running openSUSE - not sure which version, but with the lastest iSCSI target software. The config looks roughly like this: 

iSCSI target 
LVM
RAID5

Additionally, I have a DHCP+TFTP setup that allows me to boot machines without local media, i.e. PXE network boot. It's not a requirement as such, booting from CD or a USB flash should work equally well.

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