Greg Lindahl wrote:
On Sat, Apr 19, 2008 at 12:26:28PM -0700, Donald Becker wrote:
And it's why I consider full installation to be unworkable
for large clusters, especially when re-installation is considered to be
part of cluster administration.
There seem to be 3 main opinions in this area of cluster admin:
1) Install little or nothing on the nodes; reboot all the time
2) Heavy install on the nodes; re-image to ensure consistency
3) Heavy install on the nodes; other mechanism to ensure consistency
Your forgot:
4) Install nothing on the nodes, pull a kernel over the net, mount
root filesystem via NFS. Do a heavy install, manage a single image
with RPM or other package manager, have little specific config for each
individual node, rarely reboot, consistency guaranteed when all nodes
mount the same filesystem.
Craig
All of these have their pros and cons. You are correct that (2) needs
a fast re-image, since you're going to be doing it fairly frequently.
But (3) will only re-image once a year or two.
Some people in (2) reboot&reimage any time they change a single
rpm. That's a recipe for annoying your users, unless you have the
ability to do a rolling-reboot between jobs.
-- greg
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Craig Tierney ([EMAIL PROTECTED])
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