[OpenAFS] DB servers seperate from fileservers
Mon, 07 Aug 2006 08:33:38 CDT
> John Hascall <email@example.com> wrote:
> >> This means that, during about 10 days, DB servers with 2 different
> >> versions of OpenAFS will have to cohabit (1 x 1.4.1 and 2 x 1.2.13,
> >> then 2 x 1.4.1 and 1 x 1.2.13, before the final 3 x 1.4.1).
> > I suspect it will work. None the less it sounds like you
> > have put fileservers on your DB servers. This is really
> > not ideal.
> Why not? I too run fileservers on AFS DB servers.
1) Stability. The uptime of our DB servers is years,
we can only dream of that for our fileservers.
2) Restart speed. Waiting for a pile of disk to
fsck to get your DB servers up and running again
3) Load. A busy fileserver on the same machine as your
DB server can slow your whole cell.
4) Simplicity. When something is amiss with a machine,
the less things a machine is doing, the less things
to check and the less likely it is the result of
some wierd interaction.
Reasons for joining them would be (in my mind):
1) Cost. Fewer machines == Less cost
(however, you can easily run the DB servers
low-cost, even hand-me-down boxes).
2) Space, power, cooling. Either you have these or you don't.
3) You got a really small cell, so it doesn't matter.