On 2009-09-14 10:20, Mark Watts wrote: > Looking back on my notes, I'm totally wrong here. DRBD/Xen live > migration does NOT involve ext3. I'm thinking about something entirely > different. > > http://www.drbd.org/users-guide/ch-xen.html > > ext3 + allow-two-primaries will destroy data. > > /me goes for coffee.
Mark just beat me for the correction. :) I'm 100% positive Mark is well aware of what follows, but just in case some is pulling this thread from the list archives: In the case Mark describes (which is documented in the User's Guide chapter he mentioned in his follow up), you would not have ext3 directly on top of your DRBD device. Instead, your DRBD resource would be configured to act as a Virtual Block Device for Xen, that VBD would most likely contain a partition table, and you'd have ext3 inside one of the partitions. Which means that as long as you have Xen behaving correctly you're fine. And which also means it's actually rather hard to mount the ext3 filesystem from within your host, as it requires a kpartx detour which makes it a little harder shooting yourself in the foot. Having ext3 right inside dual-Primary DRBD, by contrast, makes it really easy to shoot yourself in the foot, and royally mess up your data. Don't do that. Cheers, Florian
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