High Availability via ZRS or DRBD?

Plone Support Deployment & hosting
1

Hi,

we have to run a HA setup providing writable content.
So we think about combining ZRS with pacemaker/corosync.

We considered the helpful talks:

Thanks to gyst for
http://cosent.nl/en/blog/high-availability-high-performance-plone

Thanks to jensens to for:

My questions:

  1. Are there known issues using ZRS/pacemaker/corosync ?

  2. Are there reasons to prefer DRBD instead of ZRS ?

Thank you,
maha