[Pacemaker] DRBD and fencing

[Dejan Muhamedagic]

Hi,

On Wed, Mar 10, 2010 at 11:10:31PM +0800, Martin Aspeli wrote:
> Dejan Muhamedagic wrote:
> >Hi,
> >
> >On Wed, Mar 10, 2010 at 09:02:48PM +0800, Martin Aspeli wrote:
> >>Lars Ellenberg wrote:
> >>
> >>>Or, if this is as infrequent as you say it is, have those blobs in a
> >>>regular file system on a regular partition or LV, and replace every
> >>>"echo>   blob" with "echo>   blob&&   csync2 -x blob" (you get the idea).
> >>Unfortunately, that'd mean modifying software I don't really have
> >>control over. :-/
> >
> >If they are infrequent, running csync2 as a cron job once a
> >minute would do, right?
> 
> I don't think that'd be safe for this particular application. The
> use case is CMS file uploads.
> 
> It's more likely that you'll see three writes in one minute and then
> no writes for 3 days than that you'll see the same volume of writes
> spread over the same length of time.
> 
> >ocfs2 introduces an extra level of complexity. You don't want
> >that unless really necessary.
> 
> How would that complexity manifest?

By trying to support fs read/write operations on multiple hosts
in parallel perhaps :)

Thanks,

Dejan

> Martin
> 
> -- 
> Author of `Professional Plone Development`, a book for developers who
> want to work with Plone. See http://martinaspeli.net/plone-book
> 
> 
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