[CentOS] RAID-1 strategy for a CentOS/Xen server?

Bob Tomkins bob.r350 at gmail.com
Fri Dec 7 20:13:00 UTC 2007


Hi Jon,


Not really.  Each domU has it's own storage space - which can either
> be a file or an LVM volume.  In the instance that I described, we
> "fooled" the domU by actually using LVM snapshots (let me know if
> you're not familiar with the concept) thereby only physically having
> one copy of the binaries.  Anything that was written to those domU's
> was written into the snapshot space.
>
> > How about swap?  Dom0 of course has its swap -- and could/should be
> RAIDed,
> > but what about  GuestOS' swap?  I honestly haven't gotten that far yet
> ....
>
> The domU's would each have their own swap, written to whatever
> diskspace the domU occupies.
>

Yes, I'm familiar with LVM.  But not well-versed at all in its application
in a  virtualized
scenario.

Given the RAID-1 goal of failover & backup, and a performance goal of not
bunncessarily bogging down I/O, at the moment, I'm confused by "how many
copies of each object" (binay, data, swap for Dom0 and each DomU) exist in
the scenario you've proposed.

I suspect much of this will be come clearer once I actually start "doing"
(Hardware arriving in pieces over the next week ...).

In the meantime, I need to skectch this out on paper and stare at it for
awhile -- and hope for an "aha!" moment.

Do you, perchance, have a good reference to a write-up of deploying your
proposed scenario?

Regards,

Bob
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