[Tfug] raid help

[Ronald Sutherland]

Last time I was trying to figure out what all I should mirror I was having
over heating issues (it was jumbling my RAM). I've also seen power line
sags/spikes/noise, and power supply's go bad and jumble RAM. So for my needs
I've decided that first I want data (SQL, FileServer, SVN/CVS...) mirrored
and second my system to be fully duplicated and/or real easy to build again
(a setup that is scripted). Having seen memory get messed up for various
reasons, I didn't see much advantage in adding redundancy to the virtual
part of the memory system, although I guess mirroring gives a speed
advantage during reading. I have the hardware but not yet the time to setup
full redundancy. Many of the Linux rags have ran articles on a service
called "heartbeat" that allows the backup to have a clue if the main/master
is alive and then take over if not, anyway thats what I'm looking into.

http://www.linux-ha.org/Heartbeat

On Sun, Mar 30, 2008 at 11:53 AM, Ryan Cresawn <jrcresawn at gmail.com> wrote:

> On Sun, Mar 30, 2008 at 10:34 AM, Harry McGregor <micros at osef.org> wrote:
> > Ronald Sutherland wrote:
> >  > Why put a swap file on a raid drive?
> >  Do you really want your system to crash because your swap was on a
> drive
> >  that failed?
>
> I agree.  If swap space is in use and the disk holding it dies isn't
> it true that the system would no longer have access to some of the
> data which should be returned to memory at some point?  The risk of
> this occurring is greatly reduced with swap on mirrored disks.  If I'm
> wrong I'd like to know it and why because I too have fully mirrored
> boot disks that include '/' and swap.
>
> Ryan
>
>
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