This may come handy, from the project page:
Mk-boot-usb is a perl script to create multiple-bootable usb sticks (usb keys / usb flash drives). It wipes out an entire usb stick, partitions it, creates file systems on it, installs grub, and installs a minimal linux on it. Mk-boot-usb is meant to speed up and lower the barrier of entry for creating bootable usb sticks. The usb stick will immediately become bootable (using the minimal linux), and more useful distributions can then be installed into other partitions manually simply by (1) copying any Live CD into each partition (2) modifying grub's configuration file.
=> Mk-boot-usb: a Script to Create Multiple-Bootable USB Sticks
Related: How to Create Bootable Linux CD
My previous article related to iSCSI storage and NAS storage brought a couple of questions. An interesting question from my mail bag:
I've 5 Debian Linux servers with HP SAN box. Should I boot from SAN?
No, use centralized network storage for shared data or high availability configuration only. Technically you can boot and configure system. However I don't recommend booting from SAN or any other central server until and unless you need diskless nodes:
[a] Use local storage - Always use local storage for /boot and / (root) filesystem
[b] Keep it simply - Booting from SAN volumes is complicated procedure. Most operating systems are not designed for this kind of configuration. You need to modify scripts and booting procedure.
[c] SAN booting support - Your SAN vendor must support platform booting a Linux server. You need to configure HBA and SAN according to vendor specification. You must totally depend upon SAN vendor for drivers and firmware (HBA Bios) to get thing work properly. General principle - don't put all your eggs in one basket err one vendor ;)
[d] Other factors - Proper fiber channel topology must be used. Make sure Multipathing and redundant SAN links are used. The boot disk LUN is dedicated to a single host. etc
As you can see, complications started to increases, hence I don't recommend booting from SAN.