You usually want to perform a Bare-Metal Restore any time you need to restore more than just a handful of files.
Disaster Recovery Boot Methods
There are three methods for booting into disaster recovery:
- Boot CD-ROM (some times called Live CDs)
- Live Boot (Linux Only)
- PXE (network) Boot
Boot CD-ROM
(Linux)Through R1Soft, Vaultwise provides a CD-ROM ISO image available for download. These are also referred to as Live CDs. This ISO image can be burned to a CD-ROM using any common burning software. You can request CD’s from Vaultwise by asking your sales representative.
(Windows) Use PE Builder utility burned to a CD-ROM using any common burning software.
Advantages:
Easy-to-use.
Nothing required other than a Boot CD and CD-ROM.
Disadvantages:
Requires physical access to the computer to insert the CD-ROM.
Cannot be easily automated or initiated remotely.
Live Boot (Linux Only)
Live Boot is a way to overcome the challenges with performing a Bare-Metal Restore in a remote data center where there is no physical access and PXE boot is not an option. Live Boot is currently only available for Linux.
Advantages:
Easy-to-use.
Great for people renting dedicated servers.
No physical access is required.
No PXE boot required.
Adds a permanent Grub/Lilo boot loader entry for disaster recovery.
Disadvantages:
System must be accessible over the network and have a working Linux install.
In most cases the O/S must first be re-installed before initiating a Bare-Metal Restore. In many cases this involves ordering a “restore” from the hosting provider.
Live Boot Disaster Recovery Process
1. Repair Hardware if Necessary
2. Collect all necessary OS install media and CDs
3. Re-install O/S
4. Reboot
5. Apply service packs or patches (multiple)
6. Reboot (this could be several reboots)
7. Install Live Boot
8. Reboot
9. Restore entire system or hard disk partition(s)
10. Reboot
PXE (Network) Boot
Through R1Soft we provides a .tar.gz archive containing all the files needed for PXE boot. PXE Boot is a great option for data center automation. With PXE Boot and R1Soft SSB Server it is possible to provide a hands-free fully automated disaster recovery and re-deployment system for the entire data center.
PXE boot is comprised of three components:
- Special NIC card support for PXE Boot. If your NIC does not support PXE boot then you can not use PXE boot.
- DHCP Server. PXE Boot requires a DHCP server to assign the NIC card an IP address and specify a boot image to download and load.
- TFTP Server. The NIC card will download a special PXE boot loader using TFTP. That boot use TFTP to download the kernel and initrd (initial ram disk) file.
Advantages:
Can be completely automated.
Requires no physical access.
Only a working NIC and PXE boot system is required.
Disadvantages:
Complex to setup. Requires specialized knowledge in setting up and maintaining DHCP, and TFTP.
The DHCP and TFTP server usually must be deployed in the same data center.
Custom Boot Media
You can certainly use any Boot CD or Live CD you would like to perform a disaster recovery. The only special requirement is that you install the Linux Agent and start it in disaster recovery mode (-r). This installation can take place as something permanently installed and burned into your own Boot CD.