webhostingtalk.com/archive/index.php/t-563457.html
??? LVM on a RAID mirror for Xen:
http://www.jukie.net/~bart/blog/20060410220525
Global Network Block Device
GNBD provides storage access over an Ethernet LAN, thus allowing you to share
and access logical block devices across the network. We have done something similar
earlier in this chapter using NFS. A common usage scenario of GNBD is to export
the logical block devices from LVM. It is a simple and inexpensive substitute for a
Storage Area Network (SAN) like configuration. Please be aware that one potential
drawback with using a GNBD is a possible reduction in the speed of your network.
Unless you have a blazing fast network, its speed will not be as fast as the speed of
reading from a disk.
The following resources could be useful for setting up GNBD:
How to build, install, and run GNBD:
http://sources.redhat.com/cluster/gnbd/gnbd_usage.txt
??? Xen with DRBD, GNBD and OCFS2 Howto:
http://xenamo.sourceforge.net/
Summary
In this chapter we explored three different storage mechanisms that can be utilized
for the guest domains:
Files: These are simple file based virtual block devices that are very easy to
get started with. They are great for testing, but are not recommended for
production environments.
NFS: These are remote file systems that can be exported and used by the
Xen to boot guest domains. These require the setup of a remote NFS server
that can export a file system. They are perform well and are widely used for
setting up Xen domains.
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